back

2025-08-17 15:26:44 +08:00
commit 0fee703b84
60 changed files with 8042 additions and 0 deletions
--- a/.env
+++ b/.env
@@ -0,0 +1,19 @@
+# Dify API Base URL (Common for all apps)
+DIFY_API_BASE_URL="https://dify.theaken.com/v1"
+
+# --- Dify API Keys for Specific Apps ---
+DIFY_TRANSLATOR_API_KEY="app-YOPrF2ro5fshzMkCZviIuUJd"
+DIFY_SUMMARIZER_API_KEY="app-oFptWFRlSgvwhJ8DzZKN08a0"
+DIFY_ACTION_EXTRACTOR_API_KEY="app-UHU5IrVcwE0nVvgzubpGRqym"
+DIFY_STT_API_KEY="app-xQeSipaQecs0cuKeLvYDaRsu"
+
+# Celery Configuration
+CELERY_BROKER_URL="redis://localhost:6379/0"
+CELERY_RESULT_BACKEND="redis://localhost:6379/0"
+
+# Flask App Configuration
+FLASK_RUN_PORT=12000
+
+# Database and JWT Configuration
+DATABASE_URL="mysql+pymysql://A060:WLeSCi0yhtc7@mysql.theaken.com:33306/db_A060"
+JWT_SECRET_KEY="your-super-secret-key-that-no-one-should-know"
--- a/pycache/action_item_routes.cpython-312.pyc
+++ b/pycache/action_item_routes.cpython-312.pyc
--- a/pycache/ai_routes.cpython-312.pyc
+++ b/pycache/ai_routes.cpython-312.pyc
--- a/pycache/api_routes.cpython-312.pyc
+++ b/pycache/api_routes.cpython-312.pyc
--- a/pycache/app.cpython-312.pyc
+++ b/pycache/app.cpython-312.pyc
--- a/pycache/celery_app.cpython-312.pyc
+++ b/pycache/celery_app.cpython-312.pyc
--- a/pycache/celery_worker.cpython-312.pyc
+++ b/pycache/celery_worker.cpython-312.pyc
--- a/pycache/models.cpython-312.pyc
+++ b/pycache/models.cpython-312.pyc
--- a/pycache/tasks.cpython-312.pyc
+++ b/pycache/tasks.cpython-312.pyc
--- a/action_item_routes.py
+++ b/action_item_routes.py
@@ -0,0 +1,112 @@
+# action_item_routes.py
+from flask import Blueprint, request, jsonify
+from flask_jwt_extended import jwt_required
+from datetime import date
+from models import db, User, Meeting, ActionItem
+
+action_bp = Blueprint("action_bp", __name__, url_prefix="/api")
+
+def _parse_date(s: str | None):
+    if not s:
+        return None
+    try:
+        return date.fromisoformat(str(s)[:10])
+    except Exception:
+        return None
+
+def _resolve_owner_id(owner_val: str | None):
+    """把 'owner'(使用者名稱字串) 轉到 ms_users.id，查不到就回 None。"""
+    if not owner_val:
+        return None
+    owner_val = str(owner_val).strip()
+    if not owner_val:
+        return None
+    user = User.query.filter_by(username=owner_val).first()
+    return user.id if user else None
+
+@action_bp.post("/action-items")
+@jwt_required()
+def create_action_item():
+    """
+    建立單筆代辦（會議詳情頁用）
+    允許欄位：meeting_id(必) / item(或 context) / action(必) / owner_id or owner(使用者名) / due_date or duedate / status
+    """
+    data = request.get_json(force=True) or {}
+    meeting_id = data.get("meeting_id")
+    if not meeting_id:
+        return jsonify({"error": "meeting_id is required"}), 400
+    meeting = Meeting.query.get(meeting_id)
+    if not meeting:
+        return jsonify({"error": "meeting not found"}), 404
+
+    action_text = (data.get("action") or "").strip()
+    if not action_text:
+        return jsonify({"error": "action is required"}), 400
+
+    item_text = (data.get("item") or data.get("context") or "").strip() or None
+    owner_id = data.get("owner_id")
+    if owner_id is None:
+        owner_id = _resolve_owner_id(data.get("owner"))
+    due = _parse_date(data.get("due_date") or data.get("duedate"))
+    status = (data.get("status") or "pending").strip() or "pending"
+
+    try:
+        ai = ActionItem(
+            meeting_id=meeting_id,
+            item=item_text,
+            action=action_text,
+            owner_id=owner_id,
+            due_date=due,
+            status=status,
+        )
+        db.session.add(ai)
+        db.session.commit()
+        return jsonify(ai.to_dict()), 201
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({"error": f"create failed: {e}"}), 400
+
+@action_bp.post("/meetings/<int:meeting_id>/action-items/batch")
+@jwt_required()
+def batch_create_action_items(meeting_id: int):
+    """
+    批次建立代辦（AI 預覽 → 一鍵儲存）
+    Request body: { "items": [ {item/context, action*, owner/owner_id, due_date/duedate}, ... ] }
+    """
+    payload = request.get_json(force=True) or {}
+    items = payload.get("items") or []
+    if not isinstance(items, list) or not items:
+        return jsonify({"error": "items must be a non-empty array"}), 400
+
+    meeting = Meeting.query.get(meeting_id)
+    if not meeting:
+        return jsonify({"error": "meeting not found"}), 404
+
+    created = []
+    try:
+        for r in items:
+            action_text = (r.get("action") or "").strip()
+            if not action_text:
+                continue  # 沒有 action 的略過
+
+            item_text = (r.get("item") or r.get("context") or "").strip() or None
+            owner_id = r.get("owner_id")
+            if owner_id is None:
+                owner_id = _resolve_owner_id(r.get("owner"))
+            due = _parse_date(r.get("due_date") or r.get("duedate"))
+
+            ai = ActionItem(
+                meeting_id=meeting_id,
+                item=item_text,
+                action=action_text,
+                owner_id=owner_id,
+                due_date=due,
+                status="pending",
+            )
+            db.session.add(ai)
+            created.append(ai)
+        db.session.commit()
+        return jsonify([c.to_dict() for c in created]), 201
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({"error": f"batch create failed: {e}"}), 400
--- a/ai_routes.py
+++ b/ai_routes.py
@@ -0,0 +1,40 @@
+# ai_routes.py
+from flask import Blueprint, request, jsonify
+from flask_jwt_extended import jwt_required, get_jwt_identity
+from services.dify_client import translate_text as _translate_text, summarize_text as _summarize_text, extract_action_items as _extract_action_items
+
+ai_bp = Blueprint("ai_bp", __name__, url_prefix="/api")
+
+@ai_bp.post("/translate/text")
+@jwt_required()
+def translate_text_api():
+    data = request.get_json(force=True) or {}
+    text = (data.get("text") or "").strip()
+    target = (data.get("target_lang") or "繁體中文").strip()
+    if not text:
+        return jsonify({"error": "text is required"}), 400
+    user_id = str(get_jwt_identity() or "user")
+    translated = _translate_text(text, target, user_id=user_id)
+    return jsonify({"translated": translated})
+
+@ai_bp.post("/summarize/text")
+@jwt_required()
+def summarize_text_api():
+    data = request.get_json(force=True) or {}
+    text = (data.get("text") or "").strip()
+    if not text:
+        return jsonify({"error": "text is required"}), 400
+    user_id = str(get_jwt_identity() or "user")
+    summary = _summarize_text(text, user_id=user_id)
+    return jsonify({"summary": summary})
+
+@ai_bp.post("/action-items/preview")
+@jwt_required()
+def preview_action_items_api():
+    data = request.get_json(force=True) or {}
+    text = (data.get("text") or "").strip()
+    if not text:
+        return jsonify({"error": "text is required"}), 400
+    user_id = str(get_jwt_identity() or "user")
+    items = _extract_action_items(text, user_id=user_id)
+    return jsonify({"items": items})
--- a/api_routes.py
+++ b/api_routes.py
@@ -0,0 +1,349 @@
+import os
+import uuid
+from flask import request, jsonify, send_from_directory, Blueprint, current_app
+from flask_jwt_extended import create_access_token, jwt_required, get_jwt_identity, get_jwt
+from werkzeug.utils import secure_filename
+from datetime import datetime
+
+from models import db, User, Meeting, ActionItem
+from tasks import (
+    celery, 
+    extract_audio_task, 
+    transcribe_audio_task, 
+    translate_text_task,
+    summarize_text_task
+)
+
+api_bp = Blueprint("api_bp", __name__, url_prefix="/api")
+
+def save_uploaded_file(upload_folder, file_key='file'):
+    if file_key not in request.files:
+        return None, (jsonify({'error': 'Request does not contain a file part'}), 400)
+    file = request.files[file_key]
+    if file.filename == '':
+        return None, (jsonify({'error': 'No file selected'}), 400)
+    if file:
+        original_filename = secure_filename(file.filename)
+        file_extension = os.path.splitext(original_filename)[1]
+        unique_filename = f"{uuid.uuid4()}{file_extension}"
+        file_path = os.path.join(upload_folder, unique_filename)
+        file.save(file_path)
+        return file_path, None
+    return None, (jsonify({'error': 'Unknown file error'}), 500)
+
+# --- User Authentication & Admin Routes ---
+@api_bp.route('/login', methods=['POST'])
+def login():
+    data = request.get_json()
+    user = User.query.filter_by(username=data.get('username')).first()
+    if user and user.check_password(data.get('password')):
+        access_token = create_access_token(identity=str(user.id), additional_claims={'role': user.role, 'username': user.username})
+        return jsonify(access_token=access_token)
+    return jsonify({"msg": "Bad username or password"}), 401
+
+@api_bp.route('/register', methods=['POST'])
+def register():
+    """Public endpoint for new user registration."""
+    data = request.get_json()
+    username = data.get('username')
+    password = data.get('password')
+
+    if not username or not password:
+        return jsonify({"error": "Username and password are required"}), 400
+    
+    if User.query.filter_by(username=username).first():
+        return jsonify({"error": "Username already exists"}), 409 # HTTP 409 Conflict
+
+    try:
+        new_user = User(username=username, role='user') # Default role is 'user'
+        new_user.set_password(password)
+        db.session.add(new_user)
+        db.session.commit()
+        return jsonify({"message": "User created successfully"}), 201 # HTTP 201 Created
+    except Exception as e:
+        db.session.rollback()
+        current_app.logger.error(f"Error creating user: {e}")
+        return jsonify({"error": "An internal error occurred"}), 500
+
+@api_bp.route('/admin/users', methods=['GET'])
+@jwt_required()
+def get_all_users():
+    if get_jwt().get('role') != 'admin':
+        return jsonify({"msg": "Administration rights required"}), 403
+    users = User.query.all()
+    return jsonify([user.to_dict() for user in users])
+
+@api_bp.route('/users', methods=['GET'])
+@jwt_required()
+def get_all_users_for_dropdown():
+    """A public endpoint for all logged-in users to fetch a list of users for UI selectors."""
+    users = User.query.all()
+    return jsonify([user.to_dict() for user in users])
+
+@api_bp.route('/admin/users', methods=['POST'])
+@jwt_required()
+def create_user():
+    if get_jwt().get('role') != 'admin':
+        return jsonify({"msg": "Administration rights required"}), 403
+    data = request.get_json()
+    username = data.get('username')
+    password = data.get('password')
+    role = data.get('role', 'user')
+    if not username or not password:
+        return jsonify({"error": "Username and password are required"}), 400
+    if User.query.filter_by(username=username).first():
+        return jsonify({"error": "Username already exists"}), 409
+    
+    new_user = User(username=username, role=role)
+    new_user.set_password(password)
+    db.session.add(new_user)
+    db.session.commit()
+    return jsonify(new_user.to_dict()), 201
+
+@api_bp.route('/admin/users/<int:user_id>', methods=['DELETE'])
+@jwt_required()
+def delete_user(user_id):
+    if get_jwt().get('role') != 'admin':
+        return jsonify({"msg": "Administration rights required"}), 403
+    
+    # Prevent admin from deleting themselves
+    if str(user_id) == get_jwt_identity():
+        return jsonify({"error": "Admin users cannot delete their own account"}), 400
+
+    user_to_delete = User.query.get(user_id)
+    if not user_to_delete:
+        return jsonify({"error": "User not found"}), 404
+
+    try:
+        # Disassociate meetings created by this user
+        Meeting.query.filter_by(created_by_id=user_id).update({"created_by_id": None})
+        
+        # Disassociate action items owned by this user
+        ActionItem.query.filter_by(owner_id=user_id).update({"owner_id": None})
+
+        db.session.delete(user_to_delete)
+        db.session.commit()
+        return jsonify({"msg": f"User {user_to_delete.username} has been deleted."}), 200
+    except Exception as e:
+        db.session.rollback()
+        return jsonify({"error": f"An error occurred: {str(e)}"}), 500
+
+@api_bp.route('/admin/users/<int:user_id>/password', methods=['PUT'])
+@jwt_required()
+def update_user_password(user_id):
+    if get_jwt().get('role') != 'admin':
+        return jsonify({"msg": "Administration rights required"}), 403
+
+    user_to_update = User.query.get(user_id)
+    if not user_to_update:
+        return jsonify({"error": "User not found"}), 404
+
+    data = request.get_json()
+    password = data.get('password')
+    if not password:
+        return jsonify({"error": "Password is required"}), 400
+
+    try:
+        user_to_update.set_password(password)
+        db.session.commit()
+        return jsonify({"msg": f"Password for user {user_to_update.username} has been updated."}), 200
+    except Exception as e:
+        db.session.rollback()
+        current_app.logger.error(f"Error updating password for user {user_id}: {e}")
+        return jsonify({"error": "An internal error occurred while updating the password"}), 500
+
+# --- Meeting Management Routes ---
+@api_bp.route('/meetings', methods=['GET', 'POST'])
+@jwt_required()
+def handle_meetings():
+    if request.method == 'POST':
+        data = request.get_json()
+        topic = data.get('topic')
+        meeting_date_str = data.get('meeting_date')
+        if not topic or not meeting_date_str:
+            return jsonify({'error': 'Topic and meeting_date are required'}), 400
+        try:
+            meeting_date = datetime.fromisoformat(meeting_date_str).date()
+            new_meeting = Meeting(
+                topic=topic, 
+                meeting_date=meeting_date, 
+                created_by_id=get_jwt_identity(),
+                created_at=datetime.utcnow(), # Explicitly set creation time in UTC
+                status='In Progress'  # Set default status to 'In Progress'
+            )
+            db.session.add(new_meeting)
+            db.session.commit()
+            return jsonify(new_meeting.to_dict()), 201
+        except Exception as e:
+            db.session.rollback()
+            current_app.logger.error(f"Failed to create meeting: {e}")
+            return jsonify({'error': 'Failed to create meeting due to a database error.'}), 500
+    
+    meetings = Meeting.query.order_by(Meeting.meeting_date.desc()).all()
+    return jsonify([meeting.to_dict() for meeting in meetings])
+
+@api_bp.route('/meetings/<int:meeting_id>', methods=['GET', 'PUT', 'DELETE'])
+@jwt_required()
+def handle_meeting_detail(meeting_id):
+    meeting = Meeting.query.get_or_404(meeting_id)
+    
+    if request.method == 'PUT':
+        data = request.get_json()
+        # Only update fields that are present in the request
+        if 'topic' in data:
+            meeting.topic = data.get('topic')
+        if 'status' in data:
+            # Security check: only admin or meeting creator can change the status
+            current_user_id = get_jwt_identity()
+            is_admin = get_jwt().get('role') == 'admin'
+            if not is_admin and str(meeting.created_by_id) != str(current_user_id):
+                return jsonify({"msg": "Only the meeting creator or an admin can change the status."}), 403
+            meeting.status = data.get('status')
+        if 'transcript' in data:
+            meeting.transcript = data.get('transcript')
+        if 'summary' in data:
+            meeting.summary = data.get('summary')
+        if data.get('meeting_date'):
+            meeting.meeting_date = datetime.fromisoformat(data['meeting_date']).date()
+        
+        db.session.commit()
+        # Refresh the object to avoid session state issues before serialization
+        db.session.refresh(meeting)
+        return jsonify(meeting.to_dict())
+
+    if request.method == 'DELETE':
+        if get_jwt().get('role') != 'admin':
+            return jsonify({"msg": "Administration rights required"}), 403
+        db.session.delete(meeting)
+        db.session.commit()
+        return jsonify({"msg": "Meeting and associated action items deleted"}), 200
+    
+    # GET request
+    return jsonify(meeting.to_dict())
+
+@api_bp.route('/meetings/<int:meeting_id>/summarize', methods=['POST'])
+@jwt_required()
+def summarize_meeting(meeting_id):
+    meeting = Meeting.query.get_or_404(meeting_id)
+    if not meeting.transcript:
+        return jsonify({'error': 'Meeting has no transcript to summarize.'}), 400
+    task = summarize_text_task.delay(meeting_id)
+    return jsonify({'task_id': task.id, 'status_url': f'/status/{task.id}'}), 202
+
+# --- Independent Tool Routes ---
+@api_bp.route('/tools/extract_audio', methods=['POST'])
+@jwt_required()
+def handle_extract_audio():
+    input_path, error = save_uploaded_file(current_app.config['UPLOAD_FOLDER'])
+    if error: return error
+    output_path = os.path.splitext(input_path)[0] + ".wav"
+    task = extract_audio_task.delay(input_path, output_path)
+    return jsonify({'task_id': task.id, 'status_url': f'/status/{task.id}'}), 202
+
+@api_bp.route('/tools/transcribe_audio', methods=['POST'])
+@jwt_required()
+def handle_transcribe_audio():
+    input_path, error = save_uploaded_file(current_app.config['UPLOAD_FOLDER'])
+    if error: return error
+    # The 'language' parameter is no longer needed for the Dify-based task.
+    task = transcribe_audio_task.delay(input_path)
+    return jsonify({'task_id': task.id, 'status_url': f'/status/{task.id}'}), 202
+
+@api_bp.route('/tools/translate_text', methods=['POST'])
+@jwt_required()
+def handle_translate_text():
+    data = request.get_json()
+    text_content = data.get('text')
+    target_language = data.get('target_language', '繁體中文')
+    if not text_content:
+        return jsonify({'error': 'Text content is required'}), 400
+    task = translate_text_task.delay(text_content, target_language)
+    return jsonify({'task_id': task.id, 'status_url': f'/status/{task.id}'}), 202
+
+# --- Action Item & Task Status Routes (largely unchanged) ---
+@api_bp.route('/meetings/<int:meeting_id>/action_items', methods=['GET'])
+@jwt_required()
+def get_action_items_for_meeting(meeting_id):
+    action_items = ActionItem.query.filter_by(meeting_id=meeting_id).all()
+    return jsonify([item.to_dict() for item in action_items])
+
+@api_bp.route('/action_items/<int:item_id>', methods=['PUT', 'DELETE'])
+@jwt_required()
+def handle_action_item(item_id):
+    item = ActionItem.query.get_or_404(item_id)
+    current_user_id = get_jwt_identity()
+    current_user_role = get_jwt().get('role')
+    meeting_owner_id = str(item.meeting.created_by_id)
+
+    is_admin = current_user_role == 'admin'
+    is_meeting_owner = str(current_user_id) == meeting_owner_id
+    is_action_owner = str(current_user_id) == str(item.owner_id)
+
+    if request.method == 'PUT':
+        # Edit Permission: Admin, Meeting Owner, or Action Item Owner
+        if not (is_admin or is_meeting_owner or is_action_owner):
+            return jsonify({"msg": "You do not have permission to edit this item."}), 403
+        
+        data = request.get_json()
+        item.item = data.get('item', item.item)
+        item.action = data.get('action', item.action)
+        item.status = data.get('status', item.status)
+        # Handle owner_id, allowing it to be set to null
+        if 'owner_id' in data:
+            item.owner_id = data.get('owner_id') if data.get('owner_id') else None
+        if data.get('due_date'):
+            item.due_date = datetime.fromisoformat(data['due_date']).date() if data['due_date'] else None
+        db.session.commit()
+        db.session.refresh(item)
+        return jsonify(item.to_dict())
+        
+    elif request.method == 'DELETE':
+        # Delete Permission: Admin or Meeting Owner
+        if not (is_admin or is_meeting_owner):
+            return jsonify({"msg": "You do not have permission to delete this item."}), 403
+
+        db.session.delete(item)
+        db.session.commit()
+        return jsonify({'msg': 'Action item deleted'}), 200
+
+@api_bp.route('/action_items/<int:item_id>/upload', methods=['POST'])
+@jwt_required()
+def upload_action_item_attachment(item_id):
+    item = ActionItem.query.get_or_404(item_id)
+    
+    # Basic permission check: only meeting creator or action item owner can upload
+    meeting_creator_id = item.meeting.created_by_id
+    current_user_id = get_jwt_identity()
+    
+    if str(current_user_id) != str(meeting_creator_id) and str(current_user_id) != str(item.owner_id):
+        return jsonify({"msg": "Permission denied"}), 403
+
+    file_path, error = save_uploaded_file(current_app.config['UPLOAD_FOLDER'])
+    if error:
+        return error
+    
+    # TODO: Consider deleting the old file if it exists
+    item.attachment_path = os.path.basename(file_path)
+    db.session.commit()
+    
+    return jsonify({'attachment_path': item.attachment_path}), 200
+
+@api_bp.route('/status/<task_id>')
+@jwt_required()
+def get_task_status(task_id):
+    task = celery.AsyncResult(task_id)
+    response_data = {'state': task.state, 'info': task.info if isinstance(task.info, dict) else str(task.info)}
+    if task.state == 'SUCCESS' and isinstance(task.info, dict) and 'result_path' in task.info:
+        response_data['info']['download_filename'] = os.path.basename(task.info['result_path'])
+    return jsonify(response_data)
+
+@api_bp.route('/task/<task_id>/stop', methods=['POST'])
+@jwt_required()
+def stop_task(task_id):
+    celery.control.revoke(task_id, terminate=True)
+    return jsonify({'status': 'revoked'}), 200
+
+@api_bp.route('/download/<filename>')
+@jwt_required()
+def download_file(filename):
+    return send_from_directory(current_app.config['UPLOAD_FOLDER'], filename, as_attachment=True)
--- a/app.py
+++ b/app.py
@@ -0,0 +1,95 @@
+import os
+import click
+from datetime import timedelta
+from flask import Flask
+from dotenv import load_dotenv
+from flask_migrate import Migrate
+from flask_jwt_extended import JWTManager
+from flask_cors import CORS
+
+from models import db, bcrypt, User
+from celery_app import celery # Import celery instance
+
+def create_app():
+    """Application Factory Pattern"""
+    load_dotenv()
+    app = Flask(__name__)
+
+    # --- Configuration ---
+    app.config.from_mapping(
+        SQLALCHEMY_DATABASE_URI=os.environ.get('DATABASE_URL'),
+        JWT_SECRET_KEY=os.environ.get('JWT_SECRET_KEY'),
+        SQLALCHEMY_TRACK_MODIFICATIONS=False,
+        JWT_ACCESS_TOKEN_EXPIRES=timedelta(days=3),
+        CELERY_BROKER_URL=os.environ.get('CELERY_BROKER_URL', 'redis://localhost:6379/0'),
+        CELERY_RESULT_BACKEND=os.environ.get('CELERY_RESULT_BACKEND', 'redis://localhost:6379/0'),
+        DIFY_API_BASE_URL=os.environ.get("DIFY_API_BASE_URL"),
+        DIFY_STT_API_KEY=os.environ.get("DIFY_STT_API_KEY"),
+        DIFY_TRANSLATOR_API_KEY=os.environ.get("DIFY_TRANSLATOR_API_KEY"),
+        DIFY_SUMMARIZER_API_KEY=os.environ.get("DIFY_SUMMARIZER_API_KEY"),
+        DIFY_ACTION_EXTRACTOR_API_KEY=os.environ.get("DIFY_ACTION_EXTRACTOR_API_KEY")
+    )
+
+    project_root = os.path.dirname(os.path.abspath(__file__))
+    UPLOAD_FOLDER = os.path.join(project_root, 'uploads')
+    if not os.path.exists(UPLOAD_FOLDER):
+        os.makedirs(UPLOAD_FOLDER)
+    app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
+    app.config['MAX_CONTENT_LENGTH'] = 1024 * 1024 * 1024  # 1GB upload limit
+
+    # --- Initialize Extensions ---
+    db.init_app(app)
+    bcrypt.init_app(app)
+    Migrate(app, db)
+    JWTManager(app)
+    CORS(app)
+
+    # --- Configure Celery ---
+    celery.conf.update(app.config)
+    # This custom Task class ensures tasks run with the Flask app context
+    class ContextTask(celery.Task):
+        def __call__(self, *args, **kwargs):
+            with app.app_context():
+                return self.run(*args, **kwargs)
+    celery.Task = ContextTask
+
+    # --- Import and Register Blueprints ---
+    from api_routes import api_bp
+    from ai_routes import ai_bp
+    from action_item_routes import action_bp
+    app.register_blueprint(api_bp)
+    app.register_blueprint(ai_bp)
+    app.register_blueprint(action_bp)
+
+    # --- Root Route ---
+    @app.route('/')
+    def index():
+        return "AI Meeting Assistant Backend is running."
+
+    # --- CLI Commands ---
+    @app.cli.command("create_admin")
+    @click.argument("username")
+    @click.argument("password")
+    def create_admin(username, password):
+        """Creates a new admin user."""
+        with app.app_context():
+            try:
+                if User.query.filter_by(username=username).first():
+                    print(f"Error: User '{username}' already exists.")
+                    return
+                admin_user = User(username=username, role='admin')
+                admin_user.set_password(password)
+                db.session.add(admin_user)
+                db.session.commit()
+                print(f"Admin user '{username}' created successfully.")
+            except Exception as e:
+                db.session.rollback()
+                print(f"An error occurred: {e}")
+
+    return app
+
+app = create_app()
+
+if __name__ == '__main__':
+    port = int(os.environ.get("FLASK_RUN_PORT", 5000))
+    app.run(host='0.0.0.0', port=port, debug=True)
--- a/celery_app.py
+++ b/celery_app.py
@@ -0,0 +1,13 @@
+from celery import Celery
+from dotenv import load_dotenv
+
+# Load environment variables from .env file
+load_dotenv()
+
+CELERY_BROKER_URL = 'redis://localhost:6379/0'
+CELERY_RESULT_BACKEND = 'redis://localhost:6379/0'
+
+celery = Celery('tasks', 
+                broker=CELERY_BROKER_URL, 
+                backend=CELERY_RESULT_BACKEND,
+                include=['tasks']) # Point to the tasks module
--- a/celery_worker.py
+++ b/celery_worker.py
@@ -0,0 +1,14 @@
+# This monkey-patching is crucial for eventlet/gevent to work correctly.
+# It must be done at the very top, before any other modules are imported.
+import eventlet
+eventlet.monkey_patch()
+
+from dotenv import load_dotenv
+# Load environment variables BEFORE creating the app
+load_dotenv()
+
+from app import create_app
+from celery_app import celery
+
+app = create_app()
+app.app_context().push()
--- a/frontend/.gitignore
+++ b/frontend/.gitignore
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
--- a/frontend/README.md
+++ b/frontend/README.md
@@ -0,0 +1,12 @@
+# React + Vite
+
+This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+
+Currently, two official plugins are available:
+
+- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Babel](https://babeljs.io/) for Fast Refresh
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+
+## Expanding the ESLint configuration
+
+If you are developing a production application, we recommend using TypeScript with type-aware lint rules enabled. Check out the [TS template](https://github.com/vitejs/vite/tree/main/packages/create-vite/template-react-ts) for information on how to integrate TypeScript and [`typescript-eslint`](https://typescript-eslint.io) in your project.
--- a/frontend/eslint.config.js
+++ b/frontend/eslint.config.js
@@ -0,0 +1,29 @@
+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import { defineConfig, globalIgnores } from 'eslint/config'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{js,jsx}'],
+    extends: [
+      js.configs.recommended,
+      reactHooks.configs['recommended-latest'],
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser,
+      parserOptions: {
+        ecmaVersion: 'latest',
+        ecmaFeatures: { jsx: true },
+        sourceType: 'module',
+      },
+    },
+    rules: {
+      'no-unused-vars': ['error', { varsIgnorePattern: '^[A-Z_]' }],
+    },
+  },
+])
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Meeting Assistant</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.jsx"></script>
+  </body>
+</html>
--- a/frontend/npm
+++ b/frontend/npm
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -0,0 +1,34 @@
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@emotion/react": "^11.14.0",
+    "@emotion/styled": "^11.14.1",
+    "@mui/icons-material": "^7.3.1",
+    "@mui/material": "^7.3.1",
+    "axios": "^1.11.0",
+    "jwt-decode": "^4.0.0",
+    "react": "^19.1.1",
+    "react-dom": "^19.1.1",
+    "react-router-dom": "^7.8.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.33.0",
+    "@types/react": "^19.1.10",
+    "@types/react-dom": "^19.1.7",
+    "@vitejs/plugin-react": "^5.0.0",
+    "eslint": "^9.33.0",
+    "eslint-plugin-react-hooks": "^5.2.0",
+    "eslint-plugin-react-refresh": "^0.4.20",
+    "globals": "^16.3.0",
+    "vite": "^7.1.2"
+  }
+}
--- a/frontend/public/LOGO.png
+++ b/frontend/public/LOGO.png
--- a/frontend/public/static/css/style.css
+++ b/frontend/public/static/css/style.css
@@ -0,0 +1,97 @@
+/* Dark Theme Adaptation for tools.html */
+body {
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+    background-color: #121212; /* Match MUI dark theme background */
+    color: #e0e0e0; /* Light text color for dark background */
+    margin: 20px;
+    line-height: 1.6;
+}
+
+h1, h2 {
+    color: #ffffff;
+    border-bottom: 2px solid #424242; /* Darker border */
+    padding-bottom: 10px;
+}
+
+.container {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
+    gap: 20px;
+}
+
+.card {
+    background-color: #1e1e1e; /* Darker card background */
+    border: 1px solid #424242; /* Subtle border */
+    border-radius: 8px;
+    padding: 20px;
+    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
+}
+
+.card h3 {
+    margin-top: 0;
+    color: #bb86fc; /* A nice accent color for dark theme */
+}
+
+input[type="file"], textarea {
+    width: 100%;
+    padding: 8px;
+    margin-top: 10px;
+    border-radius: 4px;
+    border: 1px solid #555;
+    background-color: #333;
+    color: #e0e0e0;
+}
+
+button {
+    background-color: #3700b3; /* MUI dark theme primary-like color */
+    color: white;
+    padding: 10px 15px;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    margin-top: 10px;
+    transition: background-color 0.3s;
+}
+
+button:hover {
+    background-color: #6200ee;
+}
+
+button:disabled {
+    background-color: #444;
+    cursor: not-allowed;
+}
+
+.progress-container, .result-container {
+    margin-top: 15px;
+    background-color: #2c2c2c;
+    padding: 15px;
+    border-radius: 4px;
+}
+
+.progress-bar {
+    width: 100%;
+    background-color: #444;
+    border-radius: 4px;
+    overflow: hidden;
+}
+
+.progress-bar-inner {
+    height: 20px;
+    width: 0%;
+    background-color: #03dac6; /* Accent color for progress */
+    text-align: center;
+    line-height: 20px;
+    color: black;
+    transition: width 0.4s ease;
+}
+
+#translation-preview {
+    white-space: pre-wrap;
+    max-height: 200px;
+    overflow-y: auto;
+    border: 1px solid #555;
+    padding: 10px;
+    margin-top: 10px;
+    background-color: #333;
+}
--- a/frontend/public/vite.svg
+++ b/frontend/public/vite.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFEA83"></stop><stop offset="8.333%" stop-color="#FFDD35"></stop><stop offset="100%" stop-color="#FFA800"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>
--- a/frontend/src/App.css
+++ b/frontend/src/App.css
@@ -0,0 +1,42 @@
+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -0,0 +1,68 @@
+import React from 'react';
+import { Routes, Route, Navigate, Outlet } from 'react-router-dom';
+import { useAuth } from './contexts/AuthContext';
+import LoginPage from './pages/LoginPage';
+import DashboardPage from './pages/DashboardPage';
+import MeetingDetailPage from './pages/MeetingDetailPage';
+import ProcessingPage from './pages/ProcessingPage'; // Restored
+import AdminPage from './pages/AdminPage'; // Added
+import Layout from './components/Layout';
+import { ThemeProvider, createTheme } from '@mui/material/styles';
+import CssBaseline from '@mui/material/CssBaseline';
+import { CircularProgress, Box } from '@mui/material';
+
+const darkTheme = createTheme({
+  palette: {
+    mode: 'dark',
+  },
+});
+
+const PrivateRoute = () => {
+  const { user, loading } = useAuth();
+
+  if (loading) {
+    return (
+      <Box sx={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100vh' }}>
+        <CircularProgress />
+      </Box>
+    );
+  }
+
+  return user ? <Layout><Outlet /></Layout> : <Navigate to="/login" />;
+};
+
+const AdminRoute = () => {
+    const { user, loading } = useAuth();
+
+    if (loading) {
+        return (
+          <Box sx={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '100vh' }}>
+            <CircularProgress />
+          </Box>
+        );
+    }
+
+    return user && user.role === 'admin' ? <Outlet /> : <Navigate to="/" />;
+};
+
+function App() {
+  return (
+    <ThemeProvider theme={darkTheme}>
+      <CssBaseline />
+      <Routes>
+        <Route path="/login" element={<LoginPage />} />
+        <Route path="/" element={<PrivateRoute />}>
+          <Route index element={<DashboardPage />} />
+          <Route path="processing" element={<ProcessingPage />} />
+          <Route path="meeting/:meetingId" element={<MeetingDetailPage />} />
+          
+          <Route path="admin" element={<AdminRoute />}>
+              <Route index element={<AdminPage />} />
+          </Route>
+        </Route>
+      </Routes>
+    </ThemeProvider>
+  );
+}
+
+export default App;
--- a/frontend/src/assets/react.svg
+++ b/frontend/src/assets/react.svg
@@ -0,0 +1 @@
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--- a/frontend/src/components/Layout.jsx
+++ b/frontend/src/components/Layout.jsx
@@ -0,0 +1,52 @@
+import React from 'react';
+import { AppBar, Toolbar, Typography, Button, Container, Box } from '@mui/material';
+import { useAuth } from '../contexts/AuthContext';
+import { Link, useNavigate } from 'react-router-dom';
+
+const Layout = ({ children }) => {
+    const { user, logout } = useAuth();
+    const navigate = useNavigate();
+
+    const handleLogout = () => {
+        logout();
+        navigate('/login');
+    };
+
+    return (
+        <Box sx={{ display: 'flex', flexDirection: 'column', minHeight: '100vh' }}>
+            <AppBar position="static">
+                <Toolbar>
+                    <Typography variant="h6" component={Link} to="/" sx={{ flexGrow: 1, color: 'inherit', textDecoration: 'none' }}>
+                        AI Meeting Assistant
+                    </Typography>
+                    {user && (
+                        <Box sx={{ display: 'flex', alignItems: 'center' }}>
+                            <Button color="inherit" component={Link} to="/">
+                                Dashboard
+                            </Button>
+                            <Button color="inherit" component={Link} to="/processing">
+                                Processing Tools
+                            </Button>
+                            {user.role === 'admin' && (
+                                <Button color="inherit" component={Link} to="/admin">
+                                    Admin
+                                </Button>
+                            )}
+                            <Typography sx={{ mx: 2 }}>
+                                | Welcome, {user.username} ({user.role})
+                            </Typography>
+                            <Button color="inherit" onClick={handleLogout}>
+                                Logout
+                            </Button>
+                        </Box>
+                    )}
+                </Toolbar>
+            </AppBar>
+            <Container component="main" maxWidth={false} sx={{ mt: 4, mb: 4, flexGrow: 1 }}>
+                {children}
+            </Container>
+        </Box>
+    );
+};
+
+export default Layout;
--- a/frontend/src/components/NewMeetingDialog.jsx
+++ b/frontend/src/components/NewMeetingDialog.jsx
@@ -0,0 +1,82 @@
+import React, { useState } from 'react';
+import {
+    Button, TextField, Dialog, DialogTitle, DialogContent, DialogActions,
+    CircularProgress, Alert
+} from '@mui/material';
+
+const NewMeetingDialog = ({ open, onClose, onCreate }) => {
+    const [topic, setTopic] = useState('');
+    const [meetingDate, setMeetingDate] = useState(new Date().toISOString().split('T')[0]); // Defaults to today
+    const [loading, setLoading] = useState(false);
+    const [error, setError] = useState('');
+
+    const handleCreate = async () => {
+        if (!topic || !meetingDate) {
+            setError('Both topic and date are required.');
+            return;
+        }
+        setError('');
+        setLoading(true);
+        try {
+            // The onCreate prop is expected to be an async function
+            // that returns the newly created meeting.
+            await onCreate(topic, meetingDate);
+            handleClose(); // Close the dialog on success
+        } catch (err) {
+            setError(err.message || 'Failed to create meeting.');
+        } finally {
+            setLoading(false);
+        }
+    };
+
+    const handleClose = () => {
+        if (loading) return; // Prevent closing while loading
+        setTopic('');
+        setMeetingDate(new Date().toISOString().split('T')[0]);
+        setError('');
+        onClose(); // Call the parent's onClose handler
+    };
+
+    return (
+        <Dialog open={open} onClose={handleClose} fullWidth maxWidth="xs">
+            <DialogTitle>Create a New Meeting</DialogTitle>
+            <DialogContent>
+                {error && <Alert severity="error" sx={{ mb: 2, mt: 1 }}>{error}</Alert>}
+                <TextField
+                    autoFocus
+                    margin="dense"
+                    id="topic"
+                    label="Meeting Topic"
+                    type="text"
+                    fullWidth
+                    variant="standard"
+                    value={topic}
+                    onChange={(e) => setTopic(e.target.value)}
+                    sx={{ mt: 2 }}
+                />
+                <TextField
+                    margin="dense"
+                    id="meetingDate"
+                    label="Meeting Date"
+                    type="date"
+                    fullWidth
+                    variant="standard"
+                    value={meetingDate}
+                    onChange={(e) => setMeetingDate(e.target.value)}
+                    InputLabelProps={{
+                        shrink: true,
+                    }}
+                    sx={{ mt: 2 }}
+                />
+            </DialogContent>
+            <DialogActions>
+                <Button onClick={handleClose} disabled={loading}>Cancel</Button>
+                <Button onClick={handleCreate} variant="contained" disabled={loading}>
+                    {loading ? <CircularProgress size={24} /> : 'Create'}
+                </Button>
+            </DialogActions>
+        </Dialog>
+    );
+};
+
+export default NewMeetingDialog;
--- a/frontend/src/components/TextProcessingTools.jsx
+++ b/frontend/src/components/TextProcessingTools.jsx
@@ -0,0 +1,116 @@
+import React, { useState, useEffect } from 'react';
+import {
+    Box, Button, Typography, Paper, TextField, Select, MenuItem, FormControl, InputLabel, Dialog, DialogTitle, DialogContent, DialogActions, CircularProgress, Alert, Table, TableBody, TableCell, TableContainer, TableHead, TableRow
+} from '@mui/material';
+import { getMeetings, createMeeting, batchCreateActionItems } from '../services/api'; // Only necessary APIs
+
+const TextProcessingTools = ({ 
+    textContent, 
+    summary, 
+    actionItems, 
+    onGenerateSummary, 
+    onPreviewActions, 
+    onActionItemChange 
+}) => {
+    const [meetings, setMeetings] = useState([]);
+    const [users, setUsers] = useState([]); // Assuming users are needed for dropdown
+    const [isMeetingDialogOpen, setIsMeetingDialogOpen] = useState(false);
+    const [associationType, setAssociationType] = useState('existing');
+    const [selectedMeetingId, setSelectedMeetingId] = useState('');
+    const [newMeetingTopic, setNewMeetingTopic] = useState('');
+    const [saveLoading, setSaveLoading] = useState(false);
+    const [error, setError] = useState('');
+
+    useEffect(() => {
+        const fetchDropdownData = async () => {
+            try {
+                const meetingsRes = await getMeetings();
+                setMeetings(meetingsRes.data);
+                if (meetingsRes.data.length > 0) {
+                    setSelectedMeetingId(meetingsRes.data[0].id);
+                }
+            } catch (err) { console.error('Could not fetch meetings for dropdown.'); }
+        };
+        fetchDropdownData();
+    }, []);
+
+    const handleInitiateSave = () => {
+        if (!actionItems || !Array.isArray(actionItems) || actionItems.length === 0) {
+            setError('No valid action items to save.');
+            return;
+        }
+        setError('');
+        setIsMeetingDialogOpen(true);
+    };
+
+    const handleConfirmSave = async () => {
+        let meetingIdToSave = selectedMeetingId;
+        if (associationType === 'new') {
+            if (!newMeetingTopic) { setError('New meeting topic is required.'); return; }
+            try {
+                const { data: newMeeting } = await createMeeting(newMeetingTopic, new Date().toISOString());
+                meetingIdToSave = newMeeting.id;
+            } catch (err) { setError('Failed to create new meeting.'); return; }
+        }
+
+        if (!meetingIdToSave) { setError('A meeting must be selected or created.'); return; }
+
+        setSaveLoading(true); setError('');
+        try {
+            const itemsToSave = actionItems.map(({ tempId, owner, duedate, ...rest }) => rest);
+            await batchCreateActionItems(meetingIdToSave, itemsToSave);
+            setIsMeetingDialogOpen(false);
+            alert('Action Items saved successfully!');
+            // Optionally, clear items after save by calling a prop function from parent
+        } catch (err) { setError(err.response?.data?.error || 'Failed to save action items.'); }
+        finally { setSaveLoading(false); }
+    };
+
+    return (
+        <Box sx={{ mt: 1 }}>
+            {error && <Alert severity="error" sx={{ mb: 2 }}>{error}</Alert>}
+            <Box sx={{display: 'flex', gap: 2, mb: 2}}>
+                <Button onClick={onGenerateSummary} disabled={!textContent} variant="outlined">Generate Summary</Button>
+                <Button onClick={onPreviewActions} disabled={!textContent} variant="outlined">Generate Action Items</Button>
+            </Box>
+
+            {summary && <Paper elevation={2} sx={{ p: 2, mb: 2 }}><Typography variant="h6">Summary</Typography><TextField fullWidth multiline rows={6} value={summary} variant="outlined" sx={{mt:1}}/></Paper>}
+            
+            {actionItems && actionItems.length > 0 && (
+                <Paper elevation={2} sx={{ p: 2 }}>
+                    <Typography variant="h6">Review and Edit Action Items</Typography>
+                    <TableContainer component={Paper} sx={{ mt: 2 }}>
+                        <Table size="small">
+                            <TableHead><TableRow><TableCell>Context</TableCell><TableCell>Action</TableCell><TableCell>Owner</TableCell><TableCell>Due Date</TableCell></TableRow></TableHead>
+                            <TableBody>{actionItems.map(item => (
+                                <TableRow key={item.tempId}>
+                                    <TableCell><TextField variant="standard" fullWidth value={item.item || ''} onChange={e => onActionItemChange(item.tempId, 'item', e.target.value)}/></TableCell>
+                                    <TableCell><TextField variant="standard" fullWidth value={item.action || ''} onChange={e => onActionItemChange(item.tempId, 'action', e.target.value)}/></TableCell>
+                                    <TableCell><TextField variant="standard" fullWidth value={item.owner || ''} onChange={e => onActionItemChange(item.tempId, 'owner', e.target.value)}/></TableCell>
+                                    <TableCell><TextField variant="standard" type="date" fullWidth value={item.due_date || ''} onChange={e => onActionItemChange(item.tempId, 'due_date', e.target.value)} InputLabelProps={{ shrink: true }}/></TableCell>
+                                </TableRow>
+                            ))}</TableBody>
+                        </Table>
+                    </TableContainer>
+                    <Box mt={2} display="flex" justifyContent="flex-end">
+                        <Button onClick={handleInitiateSave} disabled={saveLoading} variant="contained" color="primary">Save All Action Items</Button>
+                    </Box>
+                </Paper>
+            )}
+
+            <Dialog open={isMeetingDialogOpen} onClose={() => setIsMeetingDialogOpen(false)} fullWidth maxWidth="xs">
+                <DialogTitle>Associate with a Meeting</DialogTitle>
+                <DialogContent>
+                    <FormControl component="fieldset" sx={{mt:1}}><Select size="small" value={associationType} onChange={e => setAssociationType(e.target.value)}><MenuItem value="existing">Existing Meeting</MenuItem><MenuItem value="new">New Meeting</MenuItem></Select></FormControl>
+                    {associationType === 'existing' ? <FormControl fullWidth sx={{mt:2}}><InputLabel>Select Meeting</InputLabel><Select value={selectedMeetingId} label="Select Meeting" onChange={e => setSelectedMeetingId(e.target.value)}>{meetings.map(m => <MenuItem key={m.id} value={m.id}>{m.topic}</MenuItem>)}</Select></FormControl> : <TextField label="New Meeting Topic" fullWidth sx={{mt:2}} value={newMeetingTopic} onChange={e => setNewMeetingTopic(e.target.value)} />}
+                </DialogContent>
+                <DialogActions>
+                    <Button onClick={() => setIsMeetingDialogOpen(false)}>Cancel</Button>
+                    <Button onClick={handleConfirmSave} variant="contained" disabled={saveLoading}>{saveLoading ? <CircularProgress size={24}/> : 'Confirm & Save'}</Button>
+                </DialogActions>
+            </Dialog>
+        </Box>
+    );
+};
+
+export default TextProcessingTools;
--- a/frontend/src/contexts/AuthContext.jsx
+++ b/frontend/src/contexts/AuthContext.jsx
@@ -0,0 +1,88 @@
+import React, { createContext, useState, useContext, useEffect } from 'react';
+import axios from 'axios';
+import { jwtDecode } from 'jwt-decode';
+
+const AuthContext = createContext(null);
+
+const setAuthToken = token => {
+    if (token) {
+        axios.defaults.headers.common['Authorization'] = `Bearer ${token}`;
+    } else {
+        delete axios.defaults.headers.common['Authorization'];
+    }
+};
+
+export const AuthProvider = ({ children }) => {
+    const [user, setUser] = useState(null);
+    const [token, setToken] = useState(() => localStorage.getItem('token'));
+    const [loading, setLoading] = useState(true);
+
+    useEffect(() => {
+        if (token) {
+            try {
+                const decoded = jwtDecode(token);
+                const currentTime = Date.now() / 1000;
+                if (decoded.exp < currentTime) {
+                    console.log("Token expired, logging out.");
+                    logout();
+                } else {
+                    setUser({ 
+    id: decoded.sub, 
+    role: decoded.role, 
+    username: decoded.username 
+});
+                    setAuthToken(token);
+                }
+            } catch (error) {
+                console.error("Invalid token on initial load");
+                logout();
+            }
+        }
+        setLoading(false);
+    }, [token]);
+
+    const login = async (username, password) => {
+        try {
+            const response = await axios.post('/api/login', { username, password });
+            const { access_token } = response.data;
+            localStorage.setItem('token', access_token);
+            setToken(access_token);
+            const decoded = jwtDecode(access_token);
+            setUser({ 
+    id: decoded.sub, 
+    role: decoded.role, 
+    username: decoded.username 
+});
+            setAuthToken(access_token);
+            return { success: true };
+        } catch (error) {
+            console.error('Login failed:', error.response?.data?.msg || error.message);
+            return { success: false, message: error.response?.data?.msg || 'Login failed' };
+        }
+    };
+
+    const logout = () => {
+        localStorage.removeItem('token');
+        setToken(null);
+        setUser(null);
+        setAuthToken(null);
+    };
+
+    const value = {
+        user,
+        token,
+        loading,
+        login,
+        logout
+    };
+
+    return (
+        <AuthContext.Provider value={value}>
+            {!loading && children}
+        </AuthContext.Provider>
+    );
+};
+
+export const useAuth = () => {
+    return useContext(AuthContext);
+};
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -0,0 +1,27 @@
+/* Reset default styles and ensure full-width/height layout */
+html, body, #root {
+  margin: 0;
+  padding: 0;
+  width: 100%;
+  height: 100%;
+}
+
+body {
+  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+/* The rest of the default styles can be kept or removed as needed */
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
--- a/frontend/src/main.jsx
+++ b/frontend/src/main.jsx
@@ -0,0 +1,16 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App.jsx'
+import './index.css'
+import { BrowserRouter } from 'react-router-dom';
+import { AuthProvider } from './contexts/AuthContext.jsx';
+
+ReactDOM.createRoot(document.getElementById('root')).render(
+  <React.StrictMode>
+    <BrowserRouter>
+      <AuthProvider>
+        <App />
+      </AuthProvider>
+    </BrowserRouter>
+  </React.StrictMode>,
+)
--- a/frontend/src/pages/ActionItemPage.jsx
+++ b/frontend/src/pages/ActionItemPage.jsx
@@ -0,0 +1,174 @@
+import React, { useState, useEffect } from 'react';
+import { useParams, useNavigate } from 'react-router-dom';
+import {
+    Box, Typography, Paper, CircularProgress, Alert,
+    TextField, Button, Select, MenuItem, FormControl, InputLabel, Grid, Link
+} from '@mui/material';
+import { getActionItemDetails, updateActionItem, uploadAttachment } from '../services/api';
+
+const ActionItemPage = () => {
+    const { actionId } = useParams();
+    const navigate = useNavigate();
+    const [actionItem, setActionItem] = useState(null);
+    const [loading, setLoading] = useState(true);
+    const [error, setError] = useState('');
+    const [isEditing, setIsEditing] = useState(false);
+    const [attachment, setAttachment] = useState(null);
+
+    useEffect(() => {
+        const fetchActionItem = async () => {
+            setLoading(true);
+            try {
+                const data = await getActionItemDetails(actionId);
+                setActionItem(data);
+            } catch (err) {
+                setError(err.message || 'Could not fetch action item details.');
+            } finally {
+                setLoading(false);
+            }
+        };
+        fetchActionItem();
+    }, [actionId]);
+
+    const handleUpdate = async () => {
+        if (!actionItem) return;
+        setLoading(true);
+        try {
+            // Only send fields that are meant to be updated
+            const updateData = {
+                item: actionItem.item,
+                action: actionItem.action,
+                status: actionItem.status,
+                due_date: actionItem.due_date,
+                // owner_id is typically not changed from this screen, but could be added if needed
+            };
+            await updateActionItem(actionId, updateData);
+            
+            if (attachment) {
+                // Note: The backend needs an endpoint to handle attachment uploads for an action item.
+                // This is a placeholder for that functionality.
+                // await uploadAttachment(actionId, attachment);
+                console.warn("Attachment upload functionality is not yet implemented on the backend.");
+            }
+
+            setIsEditing(false);
+            // Refresh data after update
+            const data = await getActionItemDetails(actionId);
+            setActionItem(data);
+
+        } catch (err) {
+            setError(err.response?.data?.error || 'Failed to update action item.');
+        } finally {
+            setLoading(false);
+        }
+    };
+
+    const handleFileChange = (event) => {
+        setAttachment(event.target.files[0]);
+    };
+
+    if (loading) return <Box sx={{ display: 'flex', justifyContent: 'center', p: 4 }}><CircularProgress /></Box>;
+    if (error) return <Alert severity="error">{error}</Alert>;
+    if (!actionItem) return <Alert severity="info">No action item found.</Alert>;
+
+    return (
+        <Box sx={{ p: 3 }}>
+            <Typography variant="h4" gutterBottom>
+                Action Item for: {actionItem.meeting?.topic || 'General Task'}
+            </Typography>
+            <Paper sx={{ p: 3 }}>
+                <Grid container spacing={2}>
+                    <Grid item xs={12}>
+                        <TextField
+                            label="Context/Item"
+                            fullWidth
+                            multiline
+                            rows={2}
+                            value={actionItem.item || ''}
+                            onChange={(e) => setActionItem({ ...actionItem, item: e.target.value })}
+                            InputProps={{ readOnly: !isEditing }}
+                            variant={isEditing ? "outlined" : "filled"}
+                        />
+                    </Grid>
+                    <Grid item xs={12}>
+                        <TextField
+                            label="Action"
+                            fullWidth
+                            multiline
+                            rows={4}
+                            value={actionItem.action || ''}
+                            onChange={(e) => setActionItem({ ...actionItem, action: e.target.value })}
+                            InputProps={{ readOnly: !isEditing }}
+                            variant={isEditing ? "outlined" : "filled"}
+                        />
+                    </Grid>
+                    <Grid item xs={12} sm={6}>
+                        <FormControl fullWidth variant={isEditing ? "outlined" : "filled"}>
+                            <InputLabel>Status</InputLabel>
+                            <Select
+                                label="Status"
+                                value={actionItem.status || 'pending'}
+                                onChange={(e) => setActionItem({ ...actionItem, status: e.target.value })}
+                                readOnly={!isEditing}
+                            >
+                                <MenuItem value="pending">Pending</MenuItem>
+                                <MenuItem value="in_progress">In Progress</MenuItem>
+                                <MenuItem value="completed">Completed</MenuItem>
+                            </Select>
+                        </FormControl>
+                    </Grid>
+                    <Grid item xs={12} sm={6}>
+                        <TextField
+                            label="Due Date"
+                            type="date"
+                            fullWidth
+                            value={actionItem.due_date || ''}
+                            onChange={(e) => setActionItem({ ...actionItem, due_date: e.target.value })}
+                            InputProps={{ readOnly: !isEditing }}
+                            variant={isEditing ? "outlined" : "filled"}
+                            InputLabelProps={{ shrink: true }}
+                        />
+                    </Grid>
+                    <Grid item xs={12}>
+                        <Typography>Owner: {actionItem.owner?.username || 'N/A'}</Typography>
+                        {actionItem.attachment_path && (
+                            <Typography>
+                                Attachment: <Link href={`/api/download/${actionItem.attachment_path.split('/').pop()}`} target="_blank" rel="noopener">Download</Link>
+                            </Typography>
+                        )}
+                    </Grid>
+                    {isEditing && (
+                        <Grid item xs={12}>
+                            <Button
+                                variant="contained"
+                                component="label"
+                            >
+                                Upload Attachment
+                                <input
+                                    type="file"
+                                    hidden
+                                    onChange={handleFileChange}
+                                />
+                            </Button>
+                            {attachment && <Typography sx={{ display: 'inline', ml: 2 }}>{attachment.name}</Typography>}
+                        </Grid>
+                    )}
+                    <Grid item xs={12} sx={{ mt: 2 }}>
+                        {isEditing ? (
+                            <Box>
+                                <Button onClick={handleUpdate} variant="contained" color="primary" disabled={loading}>
+                                    {loading ? <CircularProgress size={24} /> : 'Save Changes'}
+                                </Button>
+                                <Button onClick={() => setIsEditing(false)} sx={{ ml: 2 }}>Cancel</Button>
+                            </Box>
+                        ) : (
+                            <Button onClick={() => setIsEditing(true)} variant="contained">Edit</Button>
+                        )}
+                    </Grid>
+                </Grid>
+            </Paper>
+        </Box>
+    );
+};
+
+export default ActionItemPage;
--- a/frontend/src/pages/AdminPage.jsx
+++ b/frontend/src/pages/AdminPage.jsx
@@ -0,0 +1,237 @@
+import React, { useState, useEffect, useCallback } from 'react';
+import {
+    Box, Typography, Paper, Table, TableBody, TableCell, TableContainer, TableHead, TableRow,
+    CircularProgress, Alert, Button, Dialog, DialogActions, DialogContent, DialogTitle, TextField,
+    Select, MenuItem, FormControl, InputLabel, IconButton, Tooltip
+} from '@mui/material';
+import AddCircleOutlineIcon from '@mui/icons-material/AddCircleOutline';
+import DeleteIcon from '@mui/icons-material/Delete';
+import LockResetIcon from '@mui/icons-material/LockReset';
+import { getUsers, createUser, deleteUser, changeUserPassword } from '../services/api';
+import { useAuth } from '../contexts/AuthContext';
+
+const PasswordChangeDialog = ({ open, onClose, onConfirm, user }) => {
+    const [password, setPassword] = useState('');
+    const [confirmPassword, setConfirmPassword] = useState('');
+    const [error, setError] = useState('');
+
+    const handleConfirm = () => {
+        if (!password) {
+            setError('Password cannot be empty.');
+            return;
+        }
+        if (password !== confirmPassword) {
+            setError('Passwords do not match.');
+            return;
+        }
+        onConfirm(user.id, password);
+    };
+
+    const handleClose = () => {
+        setPassword('');
+        setConfirmPassword('');
+        setError('');
+        onClose();
+    };
+
+    return (
+        <Dialog open={open} onClose={handleClose}>
+            <DialogTitle>Change Password for {user?.username}</DialogTitle>
+            <DialogContent>
+                {error && <Alert severity="error" sx={{ mb: 2, mt: 1 }}>{error}</Alert>}
+                <TextField autoFocus margin="dense" name="password" label="New Password" type="password" fullWidth variant="standard" value={password} onChange={(e) => setPassword(e.target.value)} />
+                <TextField margin="dense" name="confirmPassword" label="Confirm New Password" type="password" fullWidth variant="standard" value={confirmPassword} onChange={(e) => setConfirmPassword(e.target.value)} />
+            </DialogContent>
+            <DialogActions>
+                <Button onClick={handleClose}>Cancel</Button>
+                <Button onClick={handleConfirm}>Confirm Change</Button>
+            </DialogActions>
+        </Dialog>
+    );
+};
+
+
+const AdminPage = () => {
+    const { user: currentUser } = useAuth();
+    const [users, setUsers] = useState([]);
+    const [loading, setLoading] = useState(true);
+    const [error, setError] = useState('');
+    const [success, setSuccess] = useState('');
+    
+    const [isUserDialogOpen, setIsUserDialogOpen] = useState(false);
+    const [newUser, setNewUser] = useState({ username: '', password: '', role: 'user' });
+
+    const [isPasswordDialogOpen, setIsPasswordDialogOpen] = useState(false);
+    const [selectedUser, setSelectedUser] = useState(null);
+
+
+    const fetchUsers = useCallback(async () => {
+        try {
+            setLoading(true);
+            const data = await getUsers();
+            setUsers(data);
+            setError('');
+        } catch (err) {
+            setError(err.response?.data?.msg || 'Could not fetch users.');
+        } finally {
+            setLoading(false);
+        }
+    }, []);
+
+    useEffect(() => {
+        fetchUsers();
+    }, [fetchUsers]);
+
+    const handleOpenUserDialog = () => setIsUserDialogOpen(true);
+    const handleCloseUserDialog = () => {
+        setIsUserDialogOpen(false);
+        setNewUser({ username: '', password: '', role: 'user' }); // Reset form
+    };
+
+    const handleOpenPasswordDialog = (user) => {
+        setSelectedUser(user);
+        setIsPasswordDialogOpen(true);
+    };
+    const handleClosePasswordDialog = () => {
+        setSelectedUser(null);
+        setIsPasswordDialogOpen(false);
+    };
+
+    const handleCreateUser = async () => {
+        if (!newUser.username || !newUser.password) {
+            setError('Username and password are required.');
+            return;
+        }
+        try {
+            await createUser(newUser);
+            handleCloseUserDialog();
+            fetchUsers(); // Refetch the list
+            setSuccess('User created successfully.');
+        } catch (err) {
+            setError(err.response?.data?.error || 'Failed to create user.');
+        }
+    };
+
+    const handleDeleteUser = async (userId) => {
+        if (window.confirm('Are you sure you want to delete this user? This will disassociate them from all meetings and action items.')) {
+            try {
+                await deleteUser(userId);
+                fetchUsers(); // Refresh the list
+                setSuccess('User deleted successfully.');
+            } catch (err) {
+                setError(err.response?.data?.error || 'Failed to delete user.');
+            }
+        }
+    };
+
+    const handlePasswordChange = async (userId, newPassword) => {
+        try {
+            await changeUserPassword(userId, newPassword);
+            handleClosePasswordDialog();
+            setSuccess('Password updated successfully.');
+        } catch (err) {
+            // The dialog will show specific errors, this is a fallback.
+            setError(err.response?.data?.error || 'Failed to change password.');
+        }
+    };
+
+    const handleInputChange = (e) => {
+        const { name, value } = e.target;
+        setNewUser(prev => ({ ...prev, [name]: value }));
+    };
+
+    if (loading) {
+        return <Box sx={{ display: 'flex', justifyContent: 'center', mt: 4 }}><CircularProgress /></Box>;
+    }
+
+    return (
+        <Box>
+            <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 2 }}>
+                <Typography variant="h4" gutterBottom>
+                    User Management
+                </Typography>
+                <Button variant="contained" startIcon={<AddCircleOutlineIcon />} onClick={handleOpenUserDialog}>
+                    New User
+                </Button>
+            </Box>
+
+            {error && <Alert severity="error" sx={{ mb: 2 }} onClose={() => setError('')}>{error}</Alert>}
+            {success && <Alert severity="success" sx={{ mb: 2 }} onClose={() => setSuccess('')}>{success}</Alert>}
+
+
+            <TableContainer component={Paper}>
+                <Table>
+                    <TableHead>
+                        <TableRow>
+                            <TableCell>ID</TableCell>
+                            <TableCell>Username</TableCell>
+                            <TableCell>Role</TableCell>
+                            <TableCell>Created At</TableCell>
+                            <TableCell align="center">Actions</TableCell>
+                        </TableRow>
+                    </TableHead>
+                    <TableBody>
+                        {users.map((user) => (
+                            <TableRow key={user.id}>
+                                <TableCell>{user.id}</TableCell>
+                                <TableCell>{user.username}</TableCell>
+                                <TableCell>{user.role}</TableCell>
+                                <TableCell>{new Date(user.created_at).toLocaleString()}</TableCell>
+                                <TableCell align="center" sx={{ display: 'flex', justifyContent: 'center', alignItems: 'center' }}>
+                                    <Tooltip title="Change Password">
+                                        <IconButton color="primary" onClick={() => handleOpenPasswordDialog(user)}>
+                                            <LockResetIcon />
+                                        </IconButton>
+                                    </Tooltip>
+                                    {/* Prevent admin from deleting themselves, show placeholder otherwise */}
+                                    {String(currentUser.id) !== String(user.id) ? (
+                                        <Tooltip title="Delete User">
+                                            <IconButton color="error" onClick={() => handleDeleteUser(user.id)}>
+                                                <DeleteIcon />
+                                            </IconButton>
+                                        </Tooltip>
+                                    ) : (
+                                        // Invisible placeholder to maintain alignment. An IconButton is ~40px wide.
+                                        <Box sx={{ width: 40, height: 40 }} />
+                                    )}
+                                </TableCell>
+                            </TableRow>
+                        ))}
+                    </TableBody>
+                </Table>
+            </TableContainer>
+
+            {/* Create User Dialog */}
+            <Dialog open={isUserDialogOpen} onClose={handleCloseUserDialog}>
+                <DialogTitle>Create a New User</DialogTitle>
+                <DialogContent>
+                    <TextField autoFocus margin="dense" name="username" label="Username" type="text" fullWidth variant="standard" value={newUser.username} onChange={handleInputChange} />
+                    <TextField margin="dense" name="password" label="Password" type="password" fullWidth variant="standard" value={newUser.password} onChange={handleInputChange} />
+                    <FormControl fullWidth margin="dense" variant="standard">
+                        <InputLabel>Role</InputLabel>
+                        <Select name="role" value={newUser.role} onChange={handleInputChange}>
+                            <MenuItem value="user">User</MenuItem>
+                            <MenuItem value="admin">Admin</MenuItem>
+                        </Select>
+                    </FormControl>
+                </DialogContent>
+                <DialogActions>
+                    <Button onClick={handleCloseUserDialog}>Cancel</Button>
+                    <Button onClick={handleCreateUser}>Create</Button>
+                </DialogActions>
+            </Dialog>
+
+            {/* Change Password Dialog */}
+            {selectedUser && (
+                <PasswordChangeDialog
+                    open={isPasswordDialogOpen}
+                    onClose={handleClosePasswordDialog}
+                    onConfirm={handlePasswordChange}
+                    user={selectedUser}
+                />
+            )}
+        </Box>
+    );
+};
+
+export default AdminPage;
--- a/frontend/src/pages/DashboardPage.jsx
+++ b/frontend/src/pages/DashboardPage.jsx
@@ -0,0 +1,291 @@
+import React, { useState, useEffect, useMemo, useCallback } from 'react';
+import { useNavigate } from 'react-router-dom';
+import {
+    Box, Typography, Paper, Table, TableBody, TableCell, TableContainer, TableHead, TableRow,
+    CircularProgress, Alert, Button, TextField, TableSortLabel, Select, MenuItem, FormControl,
+    InputLabel, Chip, OutlinedInput, IconButton
+} from '@mui/material';
+import AddCircleOutlineIcon from '@mui/icons-material/AddCircleOutline';
+import DeleteIcon from '@mui/icons-material/Delete';
+import { getMeetings, updateMeeting, deleteMeeting, createMeeting } from '../services/api';
+import { useAuth } from '../contexts/AuthContext';
+import NewMeetingDialog from '../components/NewMeetingDialog';
+
+// Helper function for sorting
+function descendingComparator(a, b, orderBy) {
+    if (b[orderBy] < a[orderBy]) return -1;
+    if (b[orderBy] > a[orderBy]) return 1;
+    return 0;
+}
+
+function getComparator(order, orderBy) {
+    return order === 'desc'
+        ? (a, b) => descendingComparator(a, b, orderBy)
+        : (a, b) => -descendingComparator(a, b, orderBy);
+}
+
+const DashboardPage = () => {
+    const navigate = useNavigate();
+    const { user } = useAuth();
+    const [meetings, setMeetings] = useState([]);
+    const [loading, setLoading] = useState(true);
+    const [error, setError] = useState('');
+    const [deletingIds, setDeletingIds] = useState(new Set());
+    const [isModalOpen, setIsModalOpen] = useState(false);
+
+    // State for filtering and searching
+    const [topicSearch, setTopicSearch] = useState('');
+    const [ownerSearch, setOwnerSearch] = useState('');
+    const [statusFilter, setStatusFilter] = useState([]);
+
+    // State for sorting
+    const [order, setOrder] = useState('asc');
+    const [orderBy, setOrderBy] = useState('meeting_date');
+
+    const fetchMeetings = useCallback(async () => {
+        try {
+            const data = await getMeetings();
+            setMeetings(data);
+        } catch (err) {
+            setError('Could not fetch meetings.');
+        } finally {
+            setLoading(false);
+        }
+    }, []);
+
+    useEffect(() => {
+        fetchMeetings();
+    }, [fetchMeetings]);
+
+    const handleCreateMeeting = async (topic, meetingDate) => {
+        try {
+            const newMeeting = await createMeeting(topic, new Date(meetingDate).toISOString());
+            setIsModalOpen(false);
+            navigate(`/meeting/${newMeeting.id}`);
+        } catch (err) {
+            throw new Error(err.response?.data?.error || "Failed to create meeting.");
+        }
+    };
+
+    const handleSortRequest = (property) => {
+        const isAsc = orderBy === property && order === 'asc';
+        setOrder(isAsc ? 'desc' : 'asc');
+        setOrderBy(property);
+    };
+
+    const handleStatusChange = async (meetingId, newStatus) => {
+        try {
+            await updateMeeting(meetingId, { status: newStatus });
+            fetchMeetings();
+        } catch (err) {
+            setError(`Failed to update status for meeting ${meetingId}.`);
+        }
+    };
+
+    const handleDelete = async (meetingId) => {
+        if (window.confirm('Are you sure you want to delete this meeting?')) {
+            setDeletingIds(prev => new Set(prev).add(meetingId));
+            try {
+                await deleteMeeting(meetingId);
+                fetchMeetings();
+            } catch (err) {
+                setError(`Failed to delete meeting ${meetingId}.`);
+            } finally {
+                setDeletingIds(prev => {
+                    const newSet = new Set(prev);
+                    newSet.delete(meetingId);
+                    return newSet;
+                });
+            }
+        }
+    };
+
+    const uniqueStatuses = useMemo(() => {
+        const statuses = new Set(meetings.map(m => m.status));
+        return Array.from(statuses);
+    }, [meetings]);
+
+    const filteredAndSortedMeetings = useMemo(() => {
+        let filtered = meetings.filter(meeting => {
+            const topicMatch = meeting.topic.toLowerCase().includes(topicSearch.toLowerCase());
+            const ownerMatch = meeting.owner_name ? meeting.owner_name.toLowerCase().includes(ownerSearch.toLowerCase()) : ownerSearch === '';
+            const statusMatch = statusFilter.length === 0 || statusFilter.includes(meeting.status);
+            return topicMatch && ownerMatch && statusMatch;
+        });
+
+        return filtered.sort(getComparator(order, orderBy));
+    }, [meetings, topicSearch, ownerSearch, statusFilter, order, orderBy]);
+
+    if (loading) {
+        return <Box sx={{ display: 'flex', justifyContent: 'center', mt: 4 }}><CircularProgress /></Box>;
+    }
+
+    const headCells = [
+        { id: 'topic', label: 'Topic' },
+        { id: 'owner_name', label: 'Owner' },
+        { id: 'meeting_date', label: 'Meeting Date' },
+        { id: 'status', label: 'Status' },
+        { id: 'action_item_count', label: 'Action Items' },
+        { id: 'created_at', label: 'Created At' },
+    ];
+
+    const statusColorMap = {
+        'Completed': 'success',
+        'In Progress': 'info',
+        'To Do': 'warning',
+        'Failed': 'error',
+    };
+    
+    const allPossibleStatuses = ['To Do', 'In Progress', 'Completed', 'Failed'];
+
+    return (
+        <Box>
+            <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 2 }}>
+                <Typography variant="h4" gutterBottom>Dashboard</Typography>
+                <Button variant="contained" startIcon={<AddCircleOutlineIcon />} onClick={() => setIsModalOpen(true)}>
+                    New Meeting
+                </Button>
+            </Box>
+
+            <NewMeetingDialog
+                open={isModalOpen}
+                onClose={() => setIsModalOpen(false)}
+                onCreate={handleCreateMeeting}
+            />
+
+            {error && <Alert severity="error" sx={{ mb: 2, mt: 2 }} onClose={() => setError('')}>{error}</Alert>}
+
+            <Paper sx={{ p: 2, mb: 2 }}>
+                <Box sx={{ display: 'flex', gap: 2, flexDirection: { xs: 'column', md: 'row' } }}>
+                    <TextField
+                        label="Search by Topic"
+                        variant="outlined"
+                        value={topicSearch}
+                        onChange={(e) => setTopicSearch(e.target.value)}
+                        sx={{ flex: '1 1 40%' }}
+                    />
+                    <TextField
+                        label="Search by Owner"
+                        variant="outlined"
+                        value={ownerSearch}
+                        onChange={(e) => setOwnerSearch(e.target.value)}
+                        sx={{ flex: '1 1 30%' }}
+                    />
+                    <FormControl sx={{ flex: '1 1 30%' }}>
+                        <InputLabel>Filter by Status</InputLabel>
+                        <Select
+                            multiple
+                            value={statusFilter}
+                            onChange={(e) => setStatusFilter(e.target.value)}
+                            input={<OutlinedInput label="Filter by Status" />}
+                            renderValue={(selected) => (
+                                <Box sx={{ display: 'flex', flexWrap: 'wrap', gap: 0.5 }}>
+                                    {selected.map((value) => <Chip key={value} label={value} />)}
+                                </Box>
+                            )}
+                        >
+                            {uniqueStatuses.map((status) => (
+                                <MenuItem key={status} value={status}>{status}</MenuItem>
+                            ))}
+                        </Select>
+                    </FormControl>
+                </Box>
+            </Paper>
+
+            <TableContainer component={Paper}>
+                <Table>
+                    <TableHead>
+                        <TableRow>
+                            {headCells.map((headCell) => (
+                                <TableCell key={headCell.id} sortDirection={orderBy === headCell.id ? order : false}>
+                                    <TableSortLabel
+                                        active={orderBy === headCell.id}
+                                        direction={orderBy === headCell.id ? order : 'asc'}
+                                        onClick={() => handleSortRequest(headCell.id)}
+                                    >
+                                        {headCell.label}
+                                    </TableSortLabel>
+                                </TableCell>
+                            ))}
+                            <TableCell align="center">Actions</TableCell>
+                        </TableRow>
+                    </TableHead>
+                    <TableBody>
+                        {filteredAndSortedMeetings.map((meeting) => {
+                            const isOwnerOrAdmin = user && (user.role === 'admin' || String(user.id) === String(meeting.created_by_id));
+                            const isDeleting = deletingIds.has(meeting.id);
+                            
+                            let taipeiTime = 'N/A';
+                            if (meeting.created_at) {
+                                taipeiTime = new Date(meeting.created_at).toLocaleString('zh-TW', {
+                                    timeZone: 'Asia/Taipei',
+                                    year: 'numeric',
+                                    month: '2-digit',
+                                    day: '2-digit',
+                                    hour: '2-digit',
+                                    minute: '2-digit',
+                                    second: '2-digit',
+                                    hour12: false
+                                });
+                            }
+
+                            return (
+                                <TableRow key={meeting.id} hover>
+                                    <TableCell>{meeting.topic}</TableCell>
+                                    <TableCell>{meeting.owner_name || 'N/A'}</TableCell>
+                                    <TableCell>{meeting.meeting_date ? new Date(meeting.meeting_date).toLocaleDateString() : 'N/A'}</TableCell>
+                                    <TableCell>
+                                        <FormControl size="small" sx={{ minWidth: 120 }}>
+                                            <Select
+                                                value={meeting.status}
+                                                onChange={(e) => handleStatusChange(meeting.id, e.target.value)}
+                                                readOnly={!isOwnerOrAdmin}
+                                                IconComponent={!isOwnerOrAdmin ? () => null : undefined}
+                                                renderValue={(selected) => (
+                                                    <Chip
+                                                        label={selected}
+                                                        color={statusColorMap[selected] || 'default'}
+                                                        size="small"
+                                                    />
+                                                )}
+                                                sx={{ 
+                                                    '& .MuiOutlinedInput-notchedOutline': { border: 'none' },
+                                                    backgroundColor: 'transparent', 
+                                                }}
+                                            >
+                                                {allPossibleStatuses.map(status => (
+                                                    <MenuItem key={status} value={status}>
+                                                        {status}
+                                                    </MenuItem>
+                                                ))}
+                                            </Select>
+                                        </FormControl>
+                                    </TableCell>
+                                    <TableCell>{meeting.action_item_count}</TableCell>
+                                    <TableCell>{taipeiTime}</TableCell>
+                                    <TableCell align="center">
+                                        <Box sx={{ display: 'flex', justifyContent: 'center', alignItems: 'center' }}>
+                                            <Button size="small" onClick={() => navigate(`/meeting/${meeting.id}`)}>
+                                                View Details
+                                            </Button>
+                                            {isOwnerOrAdmin ? (
+                                                <IconButton size="small" onClick={() => handleDelete(meeting.id)} color="error" disabled={isDeleting}>
+                                                    {isDeleting ? <CircularProgress size={20} /> : <DeleteIcon />}
+                                                </IconButton>
+                                            ) : (
+                                                // Invisible placeholder to maintain alignment
+                                                <Box sx={{ width: 34, height: 34 }} />
+                                            )}
+                                        </Box>
+                                    </TableCell>
+                                </TableRow>
+                            );
+                        })}
+                    </TableBody>
+                </Table>
+            </TableContainer>
+        </Box>
+    );
+};
+
+export default DashboardPage;
--- a/frontend/src/pages/LoginPage.jsx
+++ b/frontend/src/pages/LoginPage.jsx
@@ -0,0 +1,155 @@
+import React, { useState } from 'react';
+import { useAuth } from '../contexts/AuthContext';
+import { useNavigate, useLocation } from 'react-router-dom';
+import { 
+    Button, TextField, Container, Typography, Box, Alert, Grid, Link, Avatar, Card, CardContent, CircularProgress 
+} from '@mui/material';
+import LockOutlinedIcon from '@mui/icons-material/LockOutlined';
+import { register } from '../services/api';
+
+const LoginPage = () => {
+    const [username, setUsername] = useState('');
+    const [password, setPassword] = useState('');
+    const [confirmPassword, setConfirmPassword] = useState('');
+    const [error, setError] = useState('');
+    const [success, setSuccess] = useState('');
+    const [loading, setLoading] = useState(false);
+    const [isRegister, setIsRegister] = useState(false);
+
+    const { login } = useAuth();
+    const navigate = useNavigate();
+    const location = useLocation();
+
+    const from = location.state?.from?.pathname || "/";
+
+    const handleLogin = async (e) => {
+        e.preventDefault();
+        setError('');
+        setSuccess('');
+        setLoading(true);
+        const { success, message } = await login(username, password);
+        if (success) {
+            navigate(from, { replace: true });
+        } else {
+            setError(message || 'Failed to log in');
+        }
+        setLoading(false);
+    };
+
+    const handleRegister = async (e) => {
+        e.preventDefault();
+        if (password !== confirmPassword) {
+            setError('Passwords do not match.');
+            return;
+        }
+        setError('');
+        setSuccess('');
+        setLoading(true);
+        try {
+            await register(username, password);
+            setSuccess('Account created successfully! Please log in.');
+            setIsRegister(false); // Switch back to login view
+            setUsername(''); // Clear fields
+            setPassword('');
+            setConfirmPassword('');
+        } catch (err) {
+            setError(err.response?.data?.error || 'Failed to create account.');
+        }
+        setLoading(false);
+    };
+
+    return (
+        <Container component="main" maxWidth="xs">
+            <Box
+                sx={{
+                    marginTop: 8,
+                    display: 'flex',
+                    flexDirection: 'column',
+                    alignItems: 'center',
+                }}
+            >
+                <Card sx={{ padding: 2, width: '100%', mt: 3 }}>
+                    <CardContent sx={{ display: 'flex', flexDirection: 'column', alignItems: 'center' }}>
+                        <Avatar
+                            src="/LOGO.png"
+                            sx={{ m: 1, bgcolor: 'secondary.main', width: 56, height: 56 }}
+                            imgProps={{ style: { objectFit: 'contain' } }}
+                        >
+                            <LockOutlinedIcon />
+                        </Avatar>
+                        <Typography component="h1" variant="h5">
+                            AI Meeting Assistant
+                        </Typography>
+                        <Typography component="h2" variant="subtitle1" sx={{ mt: 1 }}>
+                            {isRegister ? 'Create Account' : 'Sign In'}
+                        </Typography>
+                        <Box component="form" onSubmit={isRegister ? handleRegister : handleLogin} noValidate sx={{ mt: 1 }}>
+                            <TextField
+                                margin="normal"
+                                required
+                                fullWidth
+                                id="username"
+                                label="Username"
+                                name="username"
+                                autoComplete="username"
+                                autoFocus
+                                value={username}
+                                onChange={(e) => setUsername(e.target.value)}
+                            />
+                            <TextField
+                                margin="normal"
+                                required
+                                fullWidth
+                                name="password"
+                                label="Password"
+                                type="password"
+                                id="password"
+                                autoComplete={isRegister ? "new-password" : "current-password"}
+                                value={password}
+                                onChange={(e) => setPassword(e.target.value)}
+                            />
+                            {isRegister && (
+                                <TextField
+                                    margin="normal"
+                                    required
+                                    fullWidth
+                                    name="confirmPassword"
+                                    label="Confirm Password"
+                                    type="password"
+                                    id="confirmPassword"
+                                    autoComplete="new-password"
+                                    value={confirmPassword}
+                                    onChange={(e) => setConfirmPassword(e.target.value)}
+                                />
+                            )}
+                            {error && <Alert severity="error" sx={{ width: '100%', mt: 2 }}>{error}</Alert>}
+                            {success && <Alert severity="success" sx={{ width: '100%', mt: 2 }}>{success}</Alert>}
+                            <Button
+                                type="submit"
+                                fullWidth
+                                variant="contained"
+                                sx={{ mt: 3, mb: 2 }}
+                                disabled={loading}
+                            >
+                                {loading ? <CircularProgress size={24} /> : (isRegister ? 'Create Account' : 'Sign In')}
+                            </Button>
+                            <Grid container justifyContent="flex-end">
+                                <Grid item>
+                                    <Link href="#" variant="body2" onClick={() => {
+                                        setIsRegister(!isRegister);
+                                        setError('');
+                                        setSuccess('');
+                                    }}>
+                                        {isRegister ? "Already have an account? Sign In" : "Don't have an account? Sign Up"}
+                                    </Link>
+                                </Grid>
+                            </Grid>
+                        </Box>
+                    </CardContent>
+                </Card>
+            </Box>
+        </Container>
+    );
+};
+
+export default LoginPage;
--- a/frontend/src/pages/MeetingDetailPage.jsx
+++ b/frontend/src/pages/MeetingDetailPage.jsx
@@ -0,0 +1,308 @@
+import React, { useState, useEffect, useCallback } from 'react';
+import { useParams } from 'react-router-dom';
+import {
+    Box, Typography, Paper, CircularProgress, Alert, Button, IconButton, Dialog, DialogTitle, DialogContent, DialogActions,
+    Table, TableBody, TableCell, TableContainer, TableHead, TableRow, TextField, Select, MenuItem, FormControl, InputLabel,
+    Grid, Card, CardContent
+} from '@mui/material';
+import AddCircleOutlineIcon from '@mui/icons-material/AddCircleOutline';
+import EditIcon from '@mui/icons-material/Edit';
+import DeleteIcon from '@mui/icons-material/Delete';
+import SaveIcon from '@mui/icons-material/Save';
+import CancelIcon from '@mui/icons-material/Cancel';
+import PreviewIcon from '@mui/icons-material/Preview';
+import DownloadIcon from '@mui/icons-material/Download';
+import { 
+    getMeetingDetails, updateMeeting, summarizeMeeting,
+    getActionItemsForMeeting, createActionItem, updateActionItem, deleteActionItem, getAllUsers,
+    previewActionItems, batchSaveActionItems, pollTaskStatus, uploadActionItemAttachment, downloadFile
+} from '../services/api';
+import { useAuth } from '../contexts/AuthContext';
+
+const MeetingDetailPage = () => {
+    const { meetingId } = useParams();
+    const { user: currentUser } = useAuth();
+    
+    const [meeting, setMeeting] = useState(null);
+    const [loading, setLoading] = useState(true);
+    const [error, setError] = useState('');
+    const [isEditingTranscript, setIsEditingTranscript] = useState(false);
+    const [isEditingSummary, setIsEditingSummary] = useState(false);
+    const [editData, setEditData] = useState({});
+    const [summaryTask, setSummaryTask] = useState(null);
+
+    const [actionItems, setActionItems] = useState([]);
+    const [users, setUsers] = useState([]);
+    const [editingActionItemId, setEditingActionItemId] = useState(null);
+    const [editActionItemData, setEditActionItemData] = useState({});
+    const [attachmentFile, setAttachmentFile] = useState(null);
+    const [isAddActionItemOpen, setIsAddActionItemOpen] = useState(false);
+    const [newActionItem, setNewActionItem] = useState({ action: '', owner_id: '', due_date: '', item: '' });
+    const [previewedItems, setPreviewedItems] = useState([]);
+    const [isPreviewLoading, setIsPreviewLoading] = useState(false);
+
+    const fetchMeetingData = useCallback(async () => {
+        try {
+            setLoading(true);
+            const meetingRes = await getMeetingDetails(meetingId);
+            setMeeting(meetingRes);
+            setEditData(meetingRes);
+            const itemsRes = await getActionItemsForMeeting(meetingId);
+            setActionItems(itemsRes);
+        } catch (err) {
+            setError('Failed to fetch meeting data.');
+        } finally {
+            setLoading(false);
+        }
+    }, [meetingId]);
+
+    useEffect(() => {
+        fetchMeetingData();
+    }, [fetchMeetingData]);
+
+    useEffect(() => {
+        const fetchUsers = async () => {
+            try {
+                const usersRes = await getAllUsers();
+                setUsers(usersRes);
+            } catch (err) { console.warn('Could not fetch user list.'); }
+        };
+        fetchUsers();
+    }, []);
+
+    useEffect(() => {
+        let intervalId = null;
+        if (summaryTask && (summaryTask.state === 'PENDING' || summaryTask.state === 'PROGRESS')) {
+            intervalId = setInterval(async () => {
+                try {
+                    const updatedTask = await pollTaskStatus(summaryTask.status_url);
+                    if (['SUCCESS', 'FAILURE', 'REVOKED'].includes(updatedTask.state)) {
+                        clearInterval(intervalId);
+                        setSummaryTask(null);
+                        if (updatedTask.state === 'SUCCESS' && updatedTask.info.summary) {
+                            // Directly update the summary instead of refetching everything
+                            setMeeting(prevMeeting => ({...prevMeeting, summary: updatedTask.info.summary}));
+                            setEditData(prevEditData => ({...prevEditData, summary: updatedTask.info.summary}));
+                        } else {
+                            // Fallback to refetch if something goes wrong or task fails
+                            fetchMeetingData();
+                        }
+                    }
+                } catch (err) {
+                    console.error('Polling failed:', err);
+                    clearInterval(intervalId);
+                    setSummaryTask(null);
+                }
+            }, 2000);
+        }
+        return () => clearInterval(intervalId);
+    }, [summaryTask, fetchMeetingData]);
+
+    const handleSave = async (field, value) => {
+        try {
+            await updateMeeting(meetingId, { [field]: value });
+            fetchMeetingData();
+            return true;
+        } catch (err) {
+            setError(`Failed to save ${field}.`);
+            return false;
+        }
+    };
+
+    const handleSaveTranscript = async () => {
+        if (await handleSave('transcript', editData.transcript)) setIsEditingTranscript(false);
+    };
+
+    const handleSaveSummary = async () => {
+        if (await handleSave('summary', editData.summary)) setIsEditingSummary(false);
+    };
+
+    const handleGenerateSummary = async () => {
+        try {
+            const taskInfo = await summarizeMeeting(meetingId);
+            setSummaryTask({ ...taskInfo, state: 'PENDING' });
+        } catch (err) {
+            setError('Failed to start summary generation.');
+        }
+    };
+
+    const handlePreviewActionItems = async () => {
+        const textToPreview = meeting?.summary || meeting?.transcript;
+        if (!textToPreview) return;
+        setIsPreviewLoading(true);
+        try {
+            const result = await previewActionItems(textToPreview);
+            setPreviewedItems(result.items || []);
+        } catch (err) {
+            setError('Failed to generate action item preview.');
+        } finally {
+            setIsPreviewLoading(false);
+        }
+    };
+
+    const handleBatchSave = async () => {
+        if (previewedItems.length === 0) return;
+        try {
+            await batchSaveActionItems(meetingId, previewedItems);
+            setPreviewedItems([]);
+            fetchMeetingData();
+        } catch (err) {
+            setError('Failed to save action items.');
+        }
+    };
+
+    const handleEditActionItemClick = (item) => { setEditingActionItemId(item.id); setEditActionItemData({ ...item, due_date: item.due_date || '' }); };
+    const handleCancelActionItemClick = () => { setEditingActionItemId(null); setAttachmentFile(null); };
+    const handleSaveActionItemClick = async (id) => { 
+        try { 
+            await updateActionItem(id, editActionItemData); 
+            if (attachmentFile) await uploadActionItemAttachment(id, attachmentFile);
+            setEditingActionItemId(null); 
+            setAttachmentFile(null);
+            fetchMeetingData(); 
+        } catch (err) { 
+            setError('Failed to save action item.'); 
+        }
+    };
+    const handleDeleteActionItemClick = async (id) => { if (window.confirm('Are you sure?')) { try { await deleteActionItem(id); fetchMeetingData(); } catch (err) { setError('Failed to delete action item.'); }}};
+    const handleAddActionItemSave = async () => { if (!newActionItem.action) { setError('Action is required.'); return; } try { const newItem = await createActionItem({ ...newActionItem, meeting_id: meetingId }); if (attachmentFile) { await uploadActionItemAttachment(newItem.id, attachmentFile); } setIsAddActionItemOpen(false); setNewActionItem({ action: '', owner_id: '', due_date: '', item: '' }); setAttachmentFile(null); fetchMeetingData(); } catch (err) { setError('Failed to create action item.'); }};
+    const handleFileChange = (e) => { if (e.target.files[0]) setAttachmentFile(e.target.files[0]); };
+
+    if (loading) return <Box sx={{ display: 'flex', justifyContent: 'center', mt: 4 }}><CircularProgress /></Box>;
+    if (!meeting) return <Alert severity="error">Meeting not found.</Alert>;
+
+    const canManageMeeting = currentUser && meeting && (currentUser.role === 'admin' || String(currentUser.id) === String(meeting.created_by_id));
+
+    return (
+        <Box sx={{ p: 3 }}>
+            {error && <Alert severity="error" sx={{ mb: 2 }}>{error}</Alert>}
+            <Grid container spacing={3} direction="column">
+                {/* Transcript Card (Full Width) */}
+                <Grid item xs={12}>
+                    <Card>
+                        <CardContent>
+                            {isEditingTranscript ? (
+                                <>
+                                    <TextField label="Transcript" multiline rows={15} fullWidth value={editData.transcript || ''} onChange={e => setEditData({...editData, transcript: e.target.value})} />
+                                    <Box sx={{ mt: 2, display: 'flex', gap: 1 }}><Button variant="contained" onClick={handleSaveTranscript}>Save Transcript</Button><Button variant="outlined" onClick={() => { setIsEditingTranscript(false); setEditData(meeting); }}>Cancel</Button></Box>
+                                </>
+                            ) : (
+                                <>
+                                    <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
+                                        <Typography variant="h5">{meeting.topic}</Typography>
+                                        {canManageMeeting && <Button startIcon={<EditIcon />} onClick={() => setIsEditingTranscript(true)}>Edit Transcript</Button>}
+                                    </Box>
+                                    <Typography variant="body1" color="text.secondary">Status: {meeting.status}</Typography>
+                                    <Typography variant="h6" sx={{ mt: 2 }}>Transcript</Typography>
+                                    <Paper variant="outlined" sx={{ p: 2, mt: 1, minHeight: '300px', maxHeight: 400, overflow: 'auto' }}>
+                                        <Typography variant="body2" sx={{ whiteSpace: 'pre-wrap' }}>{meeting.transcript || 'No transcript provided. Edit to add one.'}</Typography>
+                                    </Paper>
+                                </>
+                            )}
+                        </CardContent>
+                    </Card>
+                </Grid>
+
+                {/* AI Tools Card (Full Width) */}
+                <Grid item xs={12}>
+                    <Card>
+                        <CardContent>
+                            <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
+                                <Typography variant="h5">AI Tools</Typography>
+                                {(canManageMeeting && !isEditingSummary) && <Button startIcon={<EditIcon />} onClick={() => setIsEditingSummary(true)}>Edit Summary</Button>}
+                            </Box>
+                            
+                            {canManageMeeting && <Button variant="contained" sx={{ mt: 2 }} onClick={handleGenerateSummary} disabled={!meeting.transcript || summaryTask || isEditingSummary}>{summaryTask ? 'Generating...' : 'Generate Summary'}</Button>}
+                            
+                            <Typography variant="h6" sx={{ mt: 2 }}>Summary</Typography>
+                            {isEditingSummary ? (
+                                <>
+                                    <TextField label="Summary" multiline rows={8} fullWidth value={editData.summary || ''} onChange={e => setEditData({...editData, summary: e.target.value})} sx={{ mt: 1 }} />
+                                    <Box sx={{ mt: 2, display: 'flex', gap: 1 }}><Button variant="contained" onClick={handleSaveSummary}>Save Summary</Button><Button variant="outlined" onClick={() => { setIsEditingSummary(false); setEditData(meeting); }}>Cancel</Button></Box>
+                                </>
+                            ) : (
+                                <Paper variant="outlined" sx={{ p: 2, mt: 1, minHeight: 215, overflow: 'auto', position: 'relative' }}>
+                                    {summaryTask && (
+                                        <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center', height: '100%', position: 'absolute', top: 0, left: 0, right: 0, bottom: 0 }}>
+                                            <CircularProgress /><Typography sx={{ ml: 2 }}>Generating...</Typography>
+                                        </Box>
+                                    )}
+                                    <Typography variant="body2" sx={{ whiteSpace: 'pre-wrap' }}>{meeting.summary || (summaryTask ? '' : 'No summary generated yet.')}</Typography>
+                                </Paper>
+                            )}
+
+                            {canManageMeeting && (
+                                <Box sx={{ mt: 3 }}>
+                                    <Button variant="outlined" startIcon={<PreviewIcon />} onClick={handlePreviewActionItems} disabled={isPreviewLoading || isEditingSummary || (!meeting.summary && !meeting.transcript)}>{isPreviewLoading ? <CircularProgress size={24} /> : "Preview Action Items"}</Button>
+                                    {previewedItems.length > 0 && (
+                                        <Box>
+                                            <TableContainer component={Paper} sx={{ mt: 2 }}><Table size="small">
+                                                <TableHead><TableRow><TableCell>Context/Item</TableCell><TableCell>Action</TableCell><TableCell>Owner</TableCell><TableCell>Due Date</TableCell></TableRow></TableHead>
+                                                <TableBody>{previewedItems.map((item, index) => (<TableRow key={index}><TableCell>{item.item}</TableCell><TableCell>{item.action}</TableCell><TableCell>{item.owner}</TableCell><TableCell>{item.due_date}</TableCell></TableRow>))}</TableBody>
+                                            </Table></TableContainer>
+                                            <Button variant="contained" sx={{ mt: 2 }} onClick={handleBatchSave}>Save All to List</Button>
+                                        </Box>
+                                    )}
+                                </Box>
+                            )}
+                        </CardContent>
+                    </Card>
+                </Grid>
+
+                {/* Action Items List Card (Full Width) */}
+                <Grid item xs={12}>
+                    <Card>
+                        <CardContent>
+                            <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 2 }}>
+                                <Typography variant="h6">Action Items</Typography>
+                                <Button variant="contained" startIcon={<AddCircleOutlineIcon />} onClick={() => setIsAddActionItemOpen(true)}>Add Manually</Button>
+                            </Box>
+                            <TableContainer component={Paper}>
+                                <Table>
+                                    <TableHead><TableRow><TableCell>Context</TableCell><TableCell>Action</TableCell><TableCell>Owner</TableCell><TableCell>Due Date</TableCell><TableCell>Status</TableCell><TableCell>Attachment</TableCell><TableCell align="center">Actions</TableCell></TableRow></TableHead>
+                                    <TableBody>
+                                        {actionItems.map((item) => {
+                                            const isEditing = editingActionItemId === item.id;
+                                            const canEditItem = currentUser && (currentUser.role === 'admin' || String(currentUser.id) === String(item.owner_id));
+                                            return (
+                                                <TableRow key={item.id}>
+                                                    <TableCell>{isEditing ? <TextField name="item" defaultValue={item.item} onChange={e => setEditActionItemData({...editActionItemData, item: e.target.value})} fullWidth /> : item.item}</TableCell>
+                                                    <TableCell>{isEditing ? <TextField name="action" defaultValue={item.action} onChange={e => setEditActionItemData({...editActionItemData, action: e.target.value})} fullWidth /> : item.action}</TableCell>
+                                                    <TableCell>{isEditing ? <FormControl fullWidth><Select name="owner_id" value={editActionItemData.owner_id || ''} onChange={e => setEditActionItemData({...editActionItemData, owner_id: e.target.value})}><MenuItem value=""><em>Unassigned</em></MenuItem>{users.map(u => <MenuItem key={u.id} value={u.id}>{u.username}</MenuItem>)}</Select></FormControl> : item.owner_name}</TableCell>
+                                                    <TableCell>{isEditing ? <TextField name="due_date" type="date" defaultValue={editActionItemData.due_date} onChange={e => setEditActionItemData({...editActionItemData, due_date: e.target.value})} InputLabelProps={{ shrink: true }} fullWidth /> : item.due_date}</TableCell>
+                                                    <TableCell>{isEditing ? <Select name="status" value={editActionItemData.status} onChange={e => setEditActionItemData({...editActionItemData, status: e.target.value})} fullWidth><MenuItem value="pending">Pending</MenuItem><MenuItem value="in_progress">In Progress</MenuItem><MenuItem value="completed">Completed</MenuItem></Select> : item.status}</TableCell>
+                                                    <TableCell>
+                                                        {isEditing ? <Button component="label" size="small">Upload File<input type="file" hidden onChange={handleFileChange} /></Button> : (item.attachment_path && <IconButton onClick={() => downloadFile(item.attachment_path)}><DownloadIcon /></IconButton>)}
+                                                        {isEditing && attachmentFile && <Typography variant="caption">{attachmentFile.name}</Typography>}
+                                                    </TableCell>
+                                                    <TableCell align="center">
+                                                        {isEditing ? <Box><IconButton onClick={() => handleSaveActionItemClick(item.id)}><SaveIcon /></IconButton><IconButton onClick={handleCancelActionItemClick}><CancelIcon /></IconButton></Box> : <Box>{canEditItem && <IconButton onClick={() => handleEditActionItemClick(item)}><EditIcon /></IconButton>}{canManageMeeting && <IconButton onClick={() => handleDeleteActionItemClick(item.id)}><DeleteIcon /></IconButton>}</Box>}
+                                                    </TableCell>
+                                                </TableRow>
+                                            );
+                                        })}
+                                    </TableBody>
+                                </Table>
+                            </TableContainer>
+                        </CardContent>
+                    </Card>
+                </Grid>
+            </Grid>
+
+            <Dialog open={isAddActionItemOpen} onClose={() => setIsAddActionItemOpen(false)} fullWidth maxWidth="sm">
+                <DialogTitle>Add New Action Item</DialogTitle>
+                <DialogContent>
+                    <TextField label="Context/Item (Optional)" fullWidth margin="dense" value={newActionItem.item} onChange={e => setNewActionItem({...newActionItem, item: e.target.value})} />
+                    <TextField label="Action (Required)" fullWidth margin="dense" required value={newActionItem.action} onChange={e => setNewActionItem({...newActionItem, action: e.target.value})} />
+                    <FormControl fullWidth margin="dense"><InputLabel>Owner</InputLabel><Select label="Owner" value={newActionItem.owner_id} onChange={e => setNewActionItem({...newActionItem, owner_id: e.target.value})}><MenuItem value=""><em>Unassigned</em></MenuItem>{users.map(u => <MenuItem key={u.id} value={u.id}>{u.username}</MenuItem>)}</Select></FormControl>
+                    <TextField label="Due Date" type="date" fullWidth margin="dense" InputLabelProps={{ shrink: true }} value={newActionItem.due_date} onChange={e => setNewActionItem({...newActionItem, due_date: e.target.value})} />
+                    <Button component="label" sx={{ mt: 1 }}>Upload Attachment<input type="file" hidden onChange={handleFileChange} /></Button>
+                    {attachmentFile && <Typography variant="caption" sx={{ ml: 1 }}>{attachmentFile.name}</Typography>}
+                </DialogContent>
+                <DialogActions><Button onClick={() => setIsAddActionItemOpen(false)}>Cancel</Button><Button onClick={handleAddActionItemSave} variant="contained">Save</Button></DialogActions>
+            </Dialog>
+        </Box>
+    );
+};
+
+export default MeetingDetailPage;
--- a/frontend/src/pages/ProcessingPage.jsx
+++ b/frontend/src/pages/ProcessingPage.jsx
@@ -0,0 +1,228 @@
+import React, { useState, useEffect, useCallback } from 'react';
+import {
+    Box, Typography, Paper, Button, CircularProgress, Alert, Grid, Card, CardContent, Chip, LinearProgress, TextField, Select, MenuItem, FormControl, InputLabel, IconButton, Tooltip
+} from '@mui/material';
+import ContentCopyIcon from '@mui/icons-material/ContentCopy';
+import DownloadIcon from '@mui/icons-material/Download';
+import { 
+    extractAudio, 
+    transcribeAudio, 
+    translateText,
+    pollTaskStatus, 
+    stopTask,
+    downloadFile
+} from '../services/api';
+
+const TaskMonitor = ({ task, onStop, title, children }) => {
+    if (!task) return null;
+    const colorMap = { PENDING: 'default', PROGRESS: 'info', SUCCESS: 'success', FAILURE: 'error', REVOKED: 'warning' };
+    const progress = task.info?.total ? (task.info.current / task.info.total * 100) : null;
+    const isRunning = task.state === 'PENDING' || task.state === 'PROGRESS';
+
+    return (
+        <Paper sx={{ p: 2, mt: 2, border: 1, borderColor: 'divider' }}>
+            <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
+                <Typography variant="subtitle2">{title}</Typography>
+                {task.state && <Chip label={task.state} color={colorMap[task.state] || 'default'} size="small" />}
+            </Box>
+            {task.info?.status_msg && <Typography variant="caption" sx={{ display: 'block', mt: 1 }}>{task.info.status_msg}</Typography>}
+            {isRunning && !progress && <LinearProgress sx={{ mt: 1 }} />}
+            {progress && <LinearProgress variant="determinate" value={progress} sx={{ mt: 1 }} />}
+            {task.state === 'FAILURE' && <Alert severity="error" sx={{mt:1}}>{task.info?.error || 'Task failed.'}</Alert>}
+            {isRunning && 
+                <Button size="small" color="error" variant="text" onClick={() => onStop(task.task_id)} sx={{mt: 1}}>Stop Task</Button>}
+            {children}
+        </Paper>
+    );
+};
+
+const ProcessingPage = () => {
+    const [tasks, setTasks] = useState({});
+    const [error, setError] = useState('');
+    const [copySuccess, setCopySuccess] = useState('');
+
+    const [extractFile, setExtractFile] = useState(null);
+    const [transcribeFile, setTranscribeFile] = useState(null);
+    const [transcribedText, setTranscribedText] = useState('');
+    const [translateFile, setTranslateFile] = useState(null);
+    const [translateTextContent, setTranslateTextContent] = useState('');
+    const [translateLang, setTranslateLang] = useState('繁體中文');
+    const [customLang, setCustomLang] = useState('');
+    const [translatedResult, setTranslatedResult] = useState('');
+
+    const handleCopyToClipboard = (text, type) => {
+        navigator.clipboard.writeText(text).then(() => {
+            setCopySuccess(type);
+            setTimeout(() => setCopySuccess(''), 2000);
+        });
+    };
+
+    const handleTranslateFileUpload = (e) => {
+        const file = e.target.files[0];
+        if (file) {
+            setTranslateFile(file);
+            const reader = new FileReader();
+            reader.onload = (evt) => setTranslateTextContent(evt.target.result);
+            reader.readAsText(file);
+        }
+    };
+
+    // This function now ONLY updates the main tasks object.
+    const handleTaskUpdate = useCallback((key, updatedTask) => {
+        setTasks(prev => ({ ...prev, [key]: updatedTask }));
+    }, []);
+
+    // This new useEffect handles the side-effects of a task completing.
+    useEffect(() => {
+        const transcribeTask = tasks.transcribe;
+        if (transcribeTask?.state === 'SUCCESS' && transcribeTask.info?.content) {
+            setTranscribedText(transcribeTask.info.content);
+        }
+
+        const translateTask = tasks.translate;
+        if (translateTask?.state === 'SUCCESS' && translateTask.info?.content) {
+            setTranslatedResult(translateTask.info.content);
+        }
+    }, [tasks]);
+
+
+    useEffect(() => {
+        const intervalIds = Object.entries(tasks).map(([key, task]) => {
+            if (task && (task.state === 'PENDING' || task.state === 'PROGRESS')) {
+                const intervalId = setInterval(async () => {
+                    try {
+                        const updatedTask = await pollTaskStatus(task.status_url);
+                        // Pass the full task object to avoid stale closures
+                        handleTaskUpdate(key, { ...task, ...updatedTask });
+                        if (['SUCCESS', 'FAILURE', 'REVOKED'].includes(updatedTask.state)) {
+                            clearInterval(intervalId);
+                        }
+                    } catch (err) {
+                        handleTaskUpdate(key, { ...task, state: 'FAILURE', info: { ...task.info, error: 'Polling failed.' } });
+                        clearInterval(intervalId);
+                    }
+                }, 2000);
+                return intervalId;
+            }
+            return null;
+        }).filter(Boolean);
+
+        return () => intervalIds.forEach(clearInterval);
+    }, [tasks, handleTaskUpdate]);
+
+    const handleStartTask = async (key, taskFn, ...args) => {
+        setError('');
+        setTasks(prev => ({ ...prev, [key]: { state: 'PENDING', info: { status_msg: 'Initializing...' } } }));
+        try {
+            const result = await taskFn(...args);
+            setTasks(prev => ({ ...prev, [key]: { ...prev[key], task_id: result.task_id, status_url: result.status_url, state: 'PENDING' } }));
+        } catch (err) {
+            const errorMsg = err.response?.data?.error || `Failed to start ${key} task.`;
+            setError(errorMsg);
+            setTasks(prev => ({ ...prev, [key]: { state: 'FAILURE', info: { error: errorMsg } } }));
+        }
+    };
+
+    const handleStopTask = async (taskId) => {
+        if (!taskId) return;
+        try {
+            await stopTask(taskId);
+            const taskKey = Object.keys(tasks).find(k => tasks[k].task_id === taskId);
+            if (taskKey) setTasks(prev => ({ ...prev, [taskKey]: { ...prev[taskKey], state: 'REVOKED' } }));
+        } catch (err) {
+            setError('Failed to stop the task.');
+        }
+    };
+
+    return (
+        <Box sx={{ p: 3 }}>
+            <Typography variant="h4" gutterBottom>Processing Tools</Typography>
+            {error && <Alert severity="error" sx={{ mb: 2 }}>{error}</Alert>}
+            <Grid container spacing={3}>
+                {/* Left Column: Extract Audio */}
+                <Grid item xs={12} md={3}>
+                    <Card sx={{ height: '100%' }}>
+                        <CardContent>
+                            <Typography variant="h6">1. Extract Audio</Typography>
+                            <Typography variant="body2" color="text.secondary" sx={{mb: 2}}>Extract audio track from a video file.</Typography>
+                            <Button variant="contained" component="label" fullWidth>Upload Video<input type="file" hidden onChange={e => setExtractFile(e.target.files[0])} /></Button>
+                            {extractFile && <Typography sx={{ mt: 1, fontStyle: 'italic', textAlign: 'center' }}>{extractFile.name}</Typography>}
+                            <Button size="small" variant="outlined" disabled={!extractFile} onClick={() => handleStartTask('extract', extractAudio, extractFile)} sx={{ display: 'block', mt: 2, mx: 'auto' }}>Start Extraction</Button>
+                            <TaskMonitor task={tasks.extract} onStop={handleStopTask} title="Extraction Progress">
+                                {tasks.extract?.state === 'SUCCESS' && tasks.extract.info.download_filename &&
+                                    <Button size="small" sx={{mt:1}} startIcon={<DownloadIcon />} onClick={() => downloadFile(tasks.extract.info.download_filename)}>Download Audio</Button>
+                                }
+                            </TaskMonitor>
+                        </CardContent>
+                    </Card>
+                </Grid>
+
+                {/* Right Column: Transcribe and Translate */}
+                <Grid item xs={12} md={9}>
+                    <Grid container spacing={3} direction="column">
+                        {/* Top-Right: Transcribe */}
+                        <Grid item xs={12}>
+                            <Card>
+                                <CardContent>
+                                    <Typography variant="h6">2. Transcribe Audio to Text</Typography>
+                                    <Button variant="contained" component="label" sx={{ mt: 2 }}>Upload Audio<input type="file" hidden onChange={e => setTranscribeFile(e.target.files[0])} /></Button>
+                                    {transcribeFile && <Typography sx={{ display: 'inline', ml: 2, fontStyle: 'italic' }}>{transcribeFile.name}</Typography>}
+                                    <Button size="small" variant="outlined" disabled={!transcribeFile} onClick={() => handleStartTask('transcribe', transcribeAudio, transcribeFile)} sx={{ ml: 2, mt: 2 }}>Start Transcription</Button>
+                                    <TaskMonitor task={tasks.transcribe} onStop={handleStopTask} title="Transcription Progress" />
+                                    <Paper sx={{p:2, mt:2, minHeight: 150, overflow: 'auto', bgcolor: '#222', position: 'relative'}}>
+                                        {(tasks.transcribe?.state === 'PENDING' || tasks.transcribe?.state === 'PROGRESS') && <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center', height: '100%', position: 'absolute', top: 0, left: 0, right: 0, bottom: 0 }}><CircularProgress size={30} /></Box>}
+                                        <Typography variant="body2" sx={{whiteSpace: 'pre-wrap'}}>{transcribedText || 'Transcription will appear here.'}</Typography>
+                                        {transcribedText && <Tooltip title={copySuccess === 'transcribed' ? 'Copied!' : 'Copy to Clipboard'}><IconButton size="small" onClick={() => handleCopyToClipboard(transcribedText, 'transcribed')} sx={{position: 'absolute', top: 5, right: 5}}><ContentCopyIcon fontSize="small" /></IconButton></Tooltip>}
+                                    </Paper>
+                                    {tasks.transcribe?.state === 'SUCCESS' && tasks.transcribe.info.result_path && <Button size="small" sx={{mt:1}} startIcon={<DownloadIcon />} onClick={() => downloadFile(tasks.transcribe.info.result_path)}>Download Transcript (.txt)</Button>}
+                                </CardContent>
+                            </Card>
+                        </Grid>
+                        {/* Bottom-Right: Translate */}
+                        <Grid item xs={12}>
+                            <Card>
+                                <CardContent>
+                                    <Typography variant="h6">3. Translate Text</Typography>
+                                    <TextField label="Paste Text or Upload .txt" multiline rows={4} fullWidth value={translateTextContent} onChange={e => setTranslateTextContent(e.target.value)} sx={{ mt: 2 }} />
+                                    <Box sx={{ display: 'flex', alignItems: 'center', mt: 2, flexWrap: 'wrap' }}>
+                                        <Button variant="contained" component="label" size="small">Upload .txt File<input type="file" accept=".txt" hidden onChange={handleTranslateFileUpload} /></Button>
+                                        {translateFile && <Typography sx={{ ml: 2, fontStyle: 'italic' }}>{translateFile.name}</Typography>}
+                                        <Box sx={{flexGrow: 1}} />
+                                        <FormControl size="small" sx={{ minWidth: 150, mr: 1, mt: { xs: 2, sm: 0 } }}>
+                                            <InputLabel>Target Language</InputLabel>
+                                            <Select value={translateLang} label="Target Language" onChange={e => setTranslateLang(e.target.value)}>
+                                                <MenuItem value="繁體中文">繁體中文</MenuItem>
+                                                <MenuItem value="简体中文">简体中文</MenuItem>
+                                                <MenuItem value="English">English</MenuItem>
+                                                <MenuItem value="Japanese">Japanese (日本語)</MenuItem>
+                                                <MenuItem value="Korean">Korean (한국어)</MenuItem>
+                                                <MenuItem value="Thai">Thai (ภาษาไทย)</MenuItem>
+                                                <MenuItem value="Vietnamese">Vietnamese (Tiếng Việt)</MenuItem>
+                                                <MenuItem value="French">French (Français)</MenuItem>
+                                                <MenuItem value="German">German (Deutsch)</MenuItem>
+                                                <MenuItem value="Spanish">Spanish (Español)</MenuItem>
+                                                <MenuItem value="Russian">Russian (Русский)</MenuItem>
+                                                <MenuItem value="Other">Other</MenuItem>
+                                            </Select>
+                                        </FormControl>
+                                        {translateLang === 'Other' && <TextField label="Specify" size="small" value={customLang} onChange={e => setCustomLang(e.target.value)} sx={{ mt: { xs: 2, sm: 0 } }} />}
+                                    </Box>
+                                    <Button size="small" variant="outlined" disabled={!translateTextContent || (translateLang === 'Other' && !customLang)} onClick={() => handleStartTask('translate', translateText, translateTextContent, translateLang === 'Other' ? customLang : translateLang)} sx={{ display: 'block', mt: 2 }}>Start Translation</Button>
+                                    <TaskMonitor task={tasks.translate} onStop={handleStopTask} title="Translation Progress" />
+                                    <Paper sx={{p:2, mt:2, minHeight: 150, overflow: 'auto', bgcolor: '#222', position: 'relative'}}>
+                                        {(tasks.translate?.state === 'PENDING' || tasks.translate?.state === 'PROGRESS') && <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'center', height: '100%', position: 'absolute', top: 0, left: 0, right: 0, bottom: 0 }}><CircularProgress size={30} /></Box>}
+                                        <Typography variant="body2" sx={{whiteSpace: 'pre-wrap'}}>{translatedResult || 'Translation will appear here.'}</Typography>
+                                        {translatedResult && <Tooltip title={copySuccess === 'translated' ? 'Copied!' : 'Copy to Clipboard'}><IconButton size="small" onClick={() => handleCopyToClipboard(translatedResult, 'translated')} sx={{position: 'absolute', top: 5, right: 5}}><ContentCopyIcon fontSize="small" /></IconButton></Tooltip>}
+                                    </Paper>
+                                    {tasks.translate?.state === 'SUCCESS' && tasks.translate.info.result_path && <Button size="small" sx={{mt:1}} startIcon={<DownloadIcon />} onClick={() => downloadFile(tasks.translate.info.result_path)}>Download Translation (.txt)</Button>}
+                                </CardContent>
+                            </Card>
+                        </Grid>
+                    </Grid>
+                </Grid>
+            </Grid>
+        </Box>
+    );
+};
+
+export default ProcessingPage;
--- a/frontend/src/services/api.js
+++ b/frontend/src/services/api.js
@@ -0,0 +1,94 @@
+import axios from 'axios';
+
+const api = axios.create({
+  baseURL: '/api',
+  withCredentials: false,
+});
+
+api.interceptors.request.use((config) => {
+  const token = localStorage.getItem('token');
+  if (token) {
+    config.headers.Authorization = `Bearer ${token}`;
+  }
+  return config;
+});
+
+const unwrap = (promise) => promise.then((r) => r.data);
+
+// --- Task Management ---
+export const pollTaskStatus = (statusUrl) => unwrap(api.get(statusUrl));
+export const stopTask = (taskId) => unwrap(api.post(`/task/${taskId}/stop`));
+export const downloadFile = async (filename) => {
+  const res = await api.get(`/download/${filename}`, { responseType: 'blob' });
+  const blob = new Blob([res.data], { type: res.headers['content-type'] });
+  const link = document.createElement('a');
+  link.href = window.URL.createObjectURL(blob);
+  link.setAttribute('download', filename);
+  document.body.appendChild(link);
+  link.click();
+  document.body.removeChild(link);
+  window.URL.revokeObjectURL(link.href);
+};
+
+
+// --- Authentication ---
+export const login = (username, password) =>
+  unwrap(api.post('/login', { username, password }));
+
+export const register = (username, password) =>
+  unwrap(api.post('/register', { username, password }));
+
+// --- Admin ---
+export const getUsers = () => unwrap(api.get('/admin/users')); // For Admin Page
+export const getAllUsers = () => unwrap(api.get('/users')); // For dropdowns
+export const createUser = (userData) => unwrap(api.post('/admin/users', userData));
+export const deleteUser = (userId) => unwrap(api.delete(`/admin/users/${userId}`));
+export const changeUserPassword = (userId, password) => 
+  unwrap(api.put(`/admin/users/${userId}/password`, { password }));
+
+// --- Meetings ---
+export const getMeetings = () => unwrap(api.get('/meetings'));
+export const createMeeting = (topic, meetingDate) => unwrap(api.post('/meetings', { topic, meeting_date: meetingDate }));
+export const getMeetingDetails = (meetingId) => unwrap(api.get(`/meetings/${meetingId}`));
+export const updateMeeting = (meetingId, data) => unwrap(api.put(`/meetings/${meetingId}`, data));
+export const deleteMeeting = (meetingId) => unwrap(api.delete(`/meetings/${meetingId}`));
+export const summarizeMeeting = (meetingId) => unwrap(api.post(`/meetings/${meetingId}/summarize`));
+
+// --- Independent Tools ---
+const startFileUploadTask = async (endpoint, file, options = {}) => {
+  const formData = new FormData();
+  formData.append('file', file);
+  for (const key in options) {
+    formData.append(key, options[key]);
+  }
+  return unwrap(api.post(endpoint, formData, {
+    headers: { 'Content-Type': 'multipart/form-data' },
+  }));
+};
+
+export const extractAudio = (file) =>
+  startFileUploadTask('/tools/extract_audio', file);
+
+export const transcribeAudio = (file) =>
+  startFileUploadTask('/tools/transcribe_audio', file);
+
+export const translateText = (text, target_language) =>
+  unwrap(api.post('/tools/translate_text', { text, target_language }));
+
+// --- AI Previews (for Meeting Page) ---
+export const previewActionItems = (text) =>
+  unwrap(api.post('/action-items/preview', { text }));
+
+// --- Action Items ---
+export const getActionItemsForMeeting = (meetingId) => unwrap(api.get(`/meetings/${meetingId}/action_items`));
+export const createActionItem = (payload) => unwrap(api.post('/action-items', payload));
+export const batchSaveActionItems = (meetingId, items) => unwrap(api.post(`/meetings/${meetingId}/action-items/batch`, { items }));
+export const updateActionItem = (itemId, updateData) => unwrap(api.put(`/action_items/${itemId}`, updateData));
+export const deleteActionItem = (itemId) => unwrap(api.delete(`/action_items/${itemId}`));
+export const uploadActionItemAttachment = (itemId, file) => {
+    const formData = new FormData();
+    formData.append('file', file);
+    return unwrap(api.post(`/action_items/${itemId}/upload`, formData, {
+        headers: { 'Content-Type': 'multipart/form-data' },
+    }));
+};
--- a/frontend/vite.config.js
+++ b/frontend/vite.config.js
@@ -0,0 +1,15 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    proxy: {
+      '/api': {
+        target: 'http://127.0.0.1:12000',
+        changeOrigin: true,
+      },
+    },
+  },
+})
--- a/migrations/README
+++ b/migrations/README
@@ -0,0 +1 @@
+Single-database configuration for Flask.
--- a/migrations/pycache/env.cpython-312.pyc
+++ b/migrations/pycache/env.cpython-312.pyc
--- a/migrations/alembic.ini
+++ b/migrations/alembic.ini
@@ -0,0 +1,50 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic,flask_migrate
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[logger_flask_migrate]
+level = INFO
+handlers =
+qualname = flask_migrate
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
--- a/migrations/env.py
+++ b/migrations/env.py
@@ -0,0 +1,104 @@
+import logging
+from logging.config import fileConfig
+
+from flask import current_app
+
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+
+def get_engine():
+    try:
+        # this works with Flask-SQLAlchemy<3 and Alchemical
+        return current_app.extensions['migrate'].db.get_engine()
+    except (TypeError, AttributeError):
+        # this works with Flask-SQLAlchemy>=3
+        return current_app.extensions['migrate'].db.engine
+
+
+def get_engine_url():
+    try:
+        return get_engine().url.render_as_string(hide_password=False).replace(
+            '%', '%%')
+    except AttributeError:
+        return str(get_engine().url).replace('%', '%%')
+
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+config.set_main_option('sqlalchemy.url', get_engine_url())
+target_db = current_app.extensions['migrate'].db
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def get_metadata():
+    if hasattr(target_db, 'metadatas'):
+        return target_db.metadatas[None]
+    return target_db.metadata
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode."""
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url, target_metadata=get_metadata(), literal_binds=True
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+# --- NEW --- Function to filter tables by prefix
+def include_name(name, type_, parent_names):
+    if type_ == 'table':
+        return name.startswith('ms_')
+    else:
+        return True
+# --- END NEW ---
+
+def run_migrations_online():
+    """Run migrations in 'online' mode."""
+
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    conf_args = current_app.extensions['migrate'].configure_args
+    if conf_args.get("process_revision_directives") is None:
+        conf_args["process_revision_directives"] = process_revision_directives
+
+    connectable = get_engine()
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=get_metadata(),
+            # --- MODIFIED --- Add the include_name filter
+            include_name=include_name,
+            **conf_args
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
--- a/migrations/script.py.mako
+++ b/migrations/script.py.mako
@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
--- a/migrations/versions/919aff0aa44b_implement_user_centric_status_and_.py
+++ b/migrations/versions/919aff0aa44b_implement_user_centric_status_and_.py
@@ -0,0 +1,34 @@
+"""Implement user-centric status and transcript field for meetings
+
+Revision ID: 919aff0aa44b
+Revises: ac069534da31
+Create Date: 2025-08-15 09:20:02.369230
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision = '919aff0aa44b'
+down_revision = 'ac069534da31'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('ms_meetings', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('transcript', sa.Text(), nullable=True))
+        batch_op.drop_column('transcript_file_path')
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('ms_meetings', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('transcript_file_path', mysql.VARCHAR(length=512), nullable=True))
+        batch_op.drop_column('transcript')
+
+    # ### end Alembic commands ###
--- a/migrations/versions/pycache/3b11caf37983_initial_migration_with_users_meetings_.cpython-312.pyc
+++ b/migrations/versions/pycache/3b11caf37983_initial_migration_with_users_meetings_.cpython-312.pyc
--- a/migrations/versions/pycache/919aff0aa44b_implement_user_centric_status_and_.cpython-312.pyc
+++ b/migrations/versions/pycache/919aff0aa44b_implement_user_centric_status_and_.cpython-312.pyc
--- a/migrations/versions/pycache/ac069534da31_add_status_and_result_fields_to_meeting.cpython-312.pyc
+++ b/migrations/versions/pycache/ac069534da31_add_status_and_result_fields_to_meeting.cpython-312.pyc
--- a/migrations/versions/ac069534da31_add_status_and_result_fields_to_meeting.py
+++ b/migrations/versions/ac069534da31_add_status_and_result_fields_to_meeting.py
@@ -0,0 +1,52 @@
+"""Add status and result fields to Meeting
+
+Revision ID: ac069534da31
+Revises: 
+Create Date: 2025-08-15 08:38:19.572077
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision = 'ac069534da31'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('ms_action_items', schema=None) as batch_op:
+        batch_op.alter_column('owner_id',
+               existing_type=mysql.INTEGER(),
+               nullable=True)
+
+    with op.batch_alter_table('ms_meetings', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('status', sa.String(length=50), nullable=False))
+        batch_op.add_column(sa.Column('transcript_file_path', sa.String(length=512), nullable=True))
+        batch_op.add_column(sa.Column('summary', sa.Text(), nullable=True))
+        batch_op.alter_column('created_by_id',
+               existing_type=mysql.INTEGER(),
+               nullable=True)
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('ms_meetings', schema=None) as batch_op:
+        batch_op.alter_column('created_by_id',
+               existing_type=mysql.INTEGER(),
+               nullable=False)
+        batch_op.drop_column('summary')
+        batch_op.drop_column('transcript_file_path')
+        batch_op.drop_column('status')
+
+    with op.batch_alter_table('ms_action_items', schema=None) as batch_op:
+        batch_op.alter_column('owner_id',
+               existing_type=mysql.INTEGER(),
+               nullable=False)
+
+    # ### end Alembic commands ###
--- a/models.py
+++ b/models.py
@@ -0,0 +1,93 @@
+from flask_sqlalchemy import SQLAlchemy
+from sqlalchemy.sql import func
+from flask_bcrypt import Bcrypt
+
+db = SQLAlchemy()
+bcrypt = Bcrypt()
+
+class User(db.Model):
+    __tablename__ = 'ms_users'
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(80), unique=True, nullable=False)
+    password_hash = db.Column(db.String(128), nullable=False)
+    role = db.Column(db.String(20), nullable=False, default='user') # 'user' or 'admin'
+    created_at = db.Column(db.DateTime(timezone=True), server_default=func.now())
+
+    def set_password(self, password):
+        self.password_hash = bcrypt.generate_password_hash(password).decode('utf-8')
+
+    def check_password(self, password):
+        return bcrypt.check_password_hash(self.password_hash, password)
+
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'username': self.username,
+            'role': self.role,
+            'created_at': self.created_at.isoformat() if self.created_at else None
+        }
+
+class Meeting(db.Model):
+    __tablename__ = 'ms_meetings'
+    id = db.Column(db.Integer, primary_key=True)
+    topic = db.Column(db.String(255), nullable=False)
+    meeting_date = db.Column(db.DateTime(timezone=True), nullable=False)
+    created_by_id = db.Column(db.Integer, db.ForeignKey('ms_users.id'), nullable=True)
+    created_at = db.Column(db.DateTime(timezone=True), server_default=func.now())
+    
+    # New user-centric status
+    status = db.Column(db.String(50), nullable=False, default='To Do') # 'To Do', 'In Progress', 'Completed'
+    
+    # Field to store the pasted transcript
+    transcript = db.Column(db.Text, nullable=True)
+    
+    # AI-generated summary
+    summary = db.Column(db.Text, nullable=True)
+    
+    # Removed transcript_file_path as it's no longer needed in this workflow
+    
+    creator = db.relationship('User', backref=db.backref('meetings', lazy=True))
+    action_items = db.relationship('ActionItem', backref='meeting', lazy='dynamic', cascade="all, delete-orphan")
+
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'topic': self.topic,
+            'meeting_date': self.meeting_date.isoformat() if self.meeting_date else None,
+            'created_by_id': self.created_by_id,
+            'owner_name': self.creator.username if self.creator else None,
+            'created_at': f"{self.created_at.isoformat()}Z" if self.created_at else None,
+            'action_item_count': self.action_items.count(),
+            'status': self.status,
+            'transcript': self.transcript,
+            'summary': self.summary,
+        }
+
+class ActionItem(db.Model):
+    __tablename__ = 'ms_action_items'
+    id = db.Column(db.Integer, primary_key=True)
+    meeting_id = db.Column(db.Integer, db.ForeignKey('ms_meetings.id'), nullable=False)
+    item = db.Column(db.Text, nullable=True)
+    action = db.Column(db.Text, nullable=False)
+    owner_id = db.Column(db.Integer, db.ForeignKey('ms_users.id'), nullable=True)
+    due_date = db.Column(db.Date, nullable=True)
+    status = db.Column(db.String(50), nullable=False, default='pending') # e.g., 'pending', 'in_progress', 'completed'
+    attachment_path = db.Column(db.String(255), nullable=True)
+    created_at = db.Column(db.DateTime(timezone=True), server_default=func.now())
+
+    owner = db.relationship('User', backref=db.backref('action_items', lazy=True))
+
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'meeting_id': self.meeting_id,
+            'meeting_topic': self.meeting.topic if self.meeting else None,
+            'item': self.item,
+            'action': self.action,
+            'owner_id': self.owner_id,
+            'owner_name': self.owner.username if self.owner else None,
+            'due_date': self.due_date.isoformat() if self.due_date else None,
+            'status': self.status,
+            'attachment_path': self.attachment_path,
+            'created_at': self.created_at.isoformat() if self.created_at else None
+        }
--- a/requirements.txt
+++ b/requirements.txt
@@ -0,0 +1,28 @@
+Flask==2.2.5
+celery==5.3.6
+redis==4.5.4
+# For NVIDIA GPU (CUDA 11.8) support, use these lines:
+torch --extra-index-url https://download.pytorch.org/whl/cu118
+torchaudio --extra-index-url https://download.pytorch.org/whl/cu118
+# For CPU-only, comment out the two lines above and uncomment the two lines below:
+# torch
+# torchaudio
+openai-whisper
+moviepy
+opencc-python-reimplemented
+ffmpeg-python
+python-dotenv
+gunicorn
+demucs
+soundfile
+gevent # Added for celery on windows
+
+# New dependencies for User Management and Database
+Flask-SQLAlchemy
+Flask-Migrate
+PyMySQL
+Flask-JWT-Extended
+Flask-Bcrypt
+
+# Dependency for calling external APIs
+requests
--- a/services/pycache/dify_client.cpython-312.pyc
+++ b/services/pycache/dify_client.cpython-312.pyc
--- a/services/dify_client.py
+++ b/services/dify_client.py
@@ -0,0 +1,93 @@
+# services/dify_client.py
+import os, json, re, requests
+from dotenv import load_dotenv
+
+load_dotenv()
+
+DIFY_BASE = os.getenv("DIFY_API_BASE_URL", "https://api.dify.ai/v1")
+TIMEOUT = 60
+
+def _post_request(endpoint: str, api_key: str, payload: dict):
+    """Generic function to post a request to a Dify endpoint."""
+    if not api_key:
+        raise RuntimeError("Dify API key is not set")
+    
+    url = f"{DIFY_BASE}{endpoint}"
+    headers = {
+        "Authorization": f"Bearer {api_key}",
+        "Content-Type": "application/json",
+    }
+    
+    # For debugging the exact payload sent to the API
+    print(f"Sending Dify request to {url}: {json.dumps(payload, indent=2, ensure_ascii=False)}")
+    
+    resp = requests.post(url, headers=headers, json=payload, timeout=TIMEOUT)
+    
+    if resp.status_code != 200:
+        print(f"Dify API Error Response: {resp.text}")
+        resp.raise_for_status()
+
+    data = resp.json()
+    return data.get("answer") or data
+
+def translate_text(text: str, target_lang: str, user_id: str = "system") -> str:
+    """
+    Calls the Dify CHAT API for translation, mimicking a user query.
+    """
+    api_key = os.getenv("DIFY_TRANSLATOR_API_KEY")
+    # Combine all information into a single query string, as expected by the prompt
+    query = f"目標語言：{target_lang}\n需翻譯內容：\n{text}"
+    
+    payload = {
+        "inputs": {}, # Chatbot apps generally don't use inputs here
+        "response_mode": "blocking",
+        "user": user_id,
+        "query": query,
+        # conversation_id is optional for single-turn interactions
+    }
+    return _post_request("/chat-messages", api_key, payload)
+
+def summarize_text(text: str, user_id: str = "system") -> str:
+    api_key = os.getenv("DIFY_SUMMARIZER_API_KEY")
+    payload = {
+        "inputs": {}, 
+        "response_mode": "blocking",
+        "user": user_id,
+        "query": text,
+    }
+    return _post_request("/chat-messages", api_key, payload)
+
+def extract_action_items(text: str, user_id: str = "system") -> list[dict]:
+    api_key = os.getenv("DIFY_ACTION_EXTRACTOR_API_KEY")
+    payload = {
+        "inputs": {}, 
+        "response_mode": "blocking",
+        "user": user_id,
+        "query": text,
+    }
+    raw = _post_request("/chat-messages", api_key, payload)
+
+    # Fault tolerance for JSON parsing
+    s = str(raw).strip()
+    s = re.sub(r"^```(?:json)?|```$", "", s, flags=re.IGNORECASE|re.MULTILINE).strip()
+    if not (s.startswith("[") and s.endswith("]")):
+        m = re.search(r"[\s\S]*\[[\s\S]*\][\s\S]*", s)
+        if m: s = m.group(0)
+
+    items = json.loads(s)
+    if not isinstance(items, list):
+        raise ValueError("Extractor did not return a list")
+
+    # Normalize keys for database storage
+    normalized = []
+    for i in items:
+        for k in ("item", "action", "owner", "duedate"):
+            if k not in i:
+                raise ValueError(f"Extractor item is missing required key: {k}")
+        normalized.append({
+            "item": i["item"],
+            "action": i["action"],
+            "owner": i["owner"],
+            "due_date": i["duedate"],
+        })
+    return normalized
--- a/static/css/style.css
+++ b/static/css/style.css
@@ -0,0 +1,38 @@
+/* static/css/style.css */
+body {
+    background-color: #f8f9fa;
+}
+
+.container {
+    max-width: 960px;
+}
+
+.card-header-tabs {
+    margin-bottom: -1px;
+}
+
+.nav-link {
+    color: #6c757d;
+}
+
+.nav-link.active {
+    color: #000;
+    background-color: #fff;
+    border-color: #dee2e6 #dee2e6 #fff;
+}
+
+.result-preview {
+    white-space: pre-wrap;
+    word-wrap: break-word;
+    max-height: 400px;
+    overflow-y: auto;
+    font-family: 'Courier New', Courier, monospace;
+}
+
+.action-btn:disabled {
+    cursor: not-allowed;
+}
+
+.progress-bar {
+    transition: width 0.6s ease;
+}
--- a/static/js/script.js
+++ b/static/js/script.js
@@ -0,0 +1,275 @@
+document.addEventListener('DOMContentLoaded', function() {
+    // --- Global variables ---
+    let statusInterval;
+    let currentTaskType = '';
+    let summaryConversationId = null;
+    let lastSummaryText = '';
+
+    // --- DOM Elements ---
+    const progressContainer = document.getElementById('progress-container');
+    const statusText = document.getElementById('status-text');
+    const progressBar = document.getElementById('progress-bar');
+    const resultContainer = document.getElementById('result-container');
+    const textResultPreview = document.getElementById('text-result-preview');
+    const downloadLink = document.getElementById('download-link');
+    const revisionArea = document.getElementById('revision-area');
+    const allActionButtons = document.querySelectorAll('.action-btn');
+
+    // --- Tab Switching Logic ---
+    const tabButtons = document.querySelectorAll('#myTab button');
+    tabButtons.forEach(button => {
+        button.addEventListener('shown.bs.tab', function() {
+            resetUiForNewTask();
+        });
+    });
+
+    // --- Event Listeners for all action buttons ---
+    allActionButtons.forEach(button => {
+        button.addEventListener('click', handleActionClick);
+    });
+
+    function handleActionClick(event) {
+        const button = event.currentTarget;
+        currentTaskType = button.dataset.task;
+
+        resetUiForNewTask();
+        button.disabled = true;
+        button.innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> 處理中...';
+        progressContainer.style.display = 'block';
+
+        if (currentTaskType === 'summarize_text') {
+            const fileInput = document.getElementById('summary-file-input');
+            const file = fileInput.files[0];
+
+            if (file) {
+                const reader = new FileReader();
+                reader.onload = function(e) {
+                    const fileContent = e.target.result;
+                    startSummarizeTask(fileContent);
+                };
+                reader.onerror = function() {
+                    handleError("讀取檔案時發生錯誤。");
+                };
+                reader.readAsText(file);
+            } else {
+                const textContent = document.getElementById('summary-source-text').value;
+                if (!textContent.trim()) {
+                    alert('請貼上文字或選擇檔案！');
+                    resetButtons();
+                    return;
+                }
+                startSummarizeTask(textContent);
+            }
+            return;
+        }
+
+        let endpoint = '';
+        let formData = new FormData();
+        let body = null;
+        let fileInput;
+
+        switch (currentTaskType) {
+            case 'extract_audio':
+                endpoint = '/extract_audio';
+                fileInput = document.getElementById('video-file');
+                break;
+
+            case 'transcribe_audio':
+                endpoint = '/transcribe_audio';
+                fileInput = document.getElementById('audio-file');
+                formData.append('language', document.getElementById('lang-select').value);
+                if (document.getElementById('use-demucs').checked) {
+                    formData.append('use_demucs', 'on');
+                }
+                break;
+
+            case 'translate_text':
+                endpoint = '/translate_text';
+                fileInput = document.getElementById('transcript-file');
+                formData.append('target_language', document.getElementById('translate-lang-select').value);
+                break;
+
+            case 'revise_summary':
+                endpoint = '/summarize_text';
+                const instruction = document.getElementById('revision-instruction').value;
+                if (!lastSummaryText) { alert('請先生成初版結論！'); resetButtons(); return; }
+                if (!instruction.trim()) { alert('請輸入修改指示！'); resetButtons(); return; }
+                body = JSON.stringify({
+                    text_content: lastSummaryText,
+                    revision_instruction: instruction,
+                    target_language: document.getElementById('summary-lang-select').value,
+                    conversation_id: summaryConversationId
+                });
+                startFetchTask(endpoint, body, { 'Content-Type': 'application/json' });
+                return;
+
+            default:
+                console.error('Unknown task type:', currentTaskType);
+                resetButtons();
+                return;
+        }
+
+        if (!fileInput || !fileInput.files[0]) {
+            alert('請選擇一個檔案！');
+            resetButtons();
+            return;
+        }
+        formData.append('file', fileInput.files[0]);
+        body = formData;
+
+        startFetchTask(endpoint, body);
+    }
+
+    function startSummarizeTask(textContent) {
+        summaryConversationId = null;
+        lastSummaryText = textContent;
+        const body = JSON.stringify({
+            text_content: textContent,
+            target_language: document.getElementById('summary-lang-select').value
+        });
+        startFetchTask('/summarize_text', body, { 'Content-Type': 'application/json' });
+    }
+
+    function startFetchTask(endpoint, body, headers = {}) {
+        updateProgress(0, '準備上傳與處理...');
+        fetch(endpoint, {
+            method: 'POST',
+            body: body,
+            headers: headers
+        })
+        .then(response => {
+            if (!response.ok) {
+                return response.json().then(err => { throw new Error(err.error || '伺服器錯誤') });
+            }
+            return response.json();
+        })
+        .then(data => {
+            if (data.task_id) {
+                statusInterval = setInterval(() => checkTaskStatus(data.status_url), 2000);
+            } else {
+                handleError(data.error || '未能啟動背景任務');
+            }
+        })
+        .catch(error => {
+            handleError(error.message || '請求失敗');
+        });
+    }
+
+    function checkTaskStatus(statusUrl) {
+        fetch(statusUrl)
+        .then(response => response.json())
+        .then(data => {
+            const info = data.info || {};
+            if (data.state === 'PROGRESS') {
+                updateProgress(info.current, info.status, info.total);
+                const previewContent = info.content || info.summary || info.preview;
+                if (previewContent) {
+                    resultContainer.style.display = 'block';
+                    textResultPreview.textContent = previewContent;
+                    textResultPreview.style.display = 'block';
+                }
+            } else if (data.state === 'SUCCESS') {
+                clearInterval(statusInterval);
+                updateProgress(100, info.status || '完成！', 100);
+                displayResult(info);
+                resetButtons();
+            } else if (data.state === 'FAILURE') {
+                clearInterval(statusInterval);
+                handleError(info.exc_message || '任務執行失敗');
+            }
+        })
+        .catch(error => {
+            clearInterval(statusInterval);
+            handleError('查詢進度時發生網路錯誤: ' + error);
+        });
+    }
+
+    function updateProgress(current, text, total = 100) {
+        const percent = total > 0 ? Math.round((current / total) * 100) : 0;
+        progressBar.style.width = percent + '%';
+        progressBar.setAttribute('aria-valuenow', percent);
+        progressBar.textContent = percent + '%';
+        statusText.textContent = text;
+    }
+
+    function displayResult(info) {
+        resultContainer.style.display = 'block';
+        
+        const content = info.content || info.summary;
+        if (content) {
+            textResultPreview.textContent = content;
+            textResultPreview.style.display = 'block';
+            lastSummaryText = content;
+        } else {
+            textResultPreview.style.display = 'none';
+        }
+
+        if (info.download_url) {
+            downloadLink.href = info.download_url;
+            downloadLink.style.display = 'inline-block';
+        }
+
+        if (currentTaskType === 'summarize_text' || currentTaskType === 'revise_summary') {
+            revisionArea.style.display = 'block';
+            summaryConversationId = info.conversation_id;
+        }
+    }
+
+    function handleError(message) {
+        statusText.textContent = `錯誤：${message}`;
+        progressBar.classList.add('bg-danger');
+        resetButtons();
+    }
+
+    function resetUiForNewTask() {
+        if (statusInterval) clearInterval(statusInterval);
+
+        progressContainer.style.display = 'none';
+        resultContainer.style.display = 'none';
+        textResultPreview.style.display = 'none';
+        textResultPreview.textContent = '';
+        downloadLink.style.display = 'none';
+        revisionArea.style.display = 'none';
+
+        progressBar.style.width = '0%';
+        progressBar.setAttribute('aria-valuenow', 0);
+        progressBar.textContent = '0%';
+        progressBar.classList.remove('bg-danger');
+        statusText.textContent = '';
+
+        resetButtons();
+    }
+
+    function resetButtons() {
+        allActionButtons.forEach(button => {
+            button.disabled = false;
+            const task = button.dataset.task;
+            let iconHtml = '';
+            let text = '';
+
+            switch(task) {
+                case 'extract_audio':
+                    iconHtml = '<i class="bi bi-arrow-repeat me-2"></i>';
+                    text = '開始轉換';
+                    break;
+                case 'transcribe_audio':
+                    iconHtml = '<i class="bi bi-mic-fill me-2"></i>';
+                    text = '開始轉錄';
+                    break;
+                case 'translate_text':
+                    iconHtml = '<i class="bi bi-translate me-2"></i>';
+                    text = '開始翻譯';
+                    break;
+                case 'summarize_text':
+                    iconHtml = '<i class="bi bi-card-text me-2"></i>';
+                    text = '產生初版結論';
+                    break;
+                case 'revise_summary':
+                    iconHtml = '<i class="bi bi-pencil-square me-2"></i>';
+                    text = '根據指示產生修改版';
+                    break;
+            }
+            button.innerHTML = iconHtml + text;
+        });
+    }
+});
--- a/tasks.py
+++ b/tasks.py
@@ -0,0 +1,431 @@
+import os
+import uuid
+import requests
+import json
+import re
+import io
+from datetime import timedelta
+from pydub import AudioSegment
+from pydub.silence import split_on_silence
+from moviepy import VideoFileClip
+from celery_app import celery
+from models import db, Meeting
+import math
+
+from celery import Task
+
+class ProgressTask(Task):
+    def update_progress(self, current, total, status_msg, extra_info=None):
+        meta = {'current': current, 'total': total, 'status_msg': status_msg}
+        if extra_info and isinstance(extra_info, dict):
+            meta.update(extra_info)
+        self.update_state(state='PROGRESS', meta=meta)
+
+# --- Dify Helper Functions ---
+def ask_dify(api_key: str, query: str, **kwargs):
+    from flask import current_app
+    DIFY_API_BASE_URL = current_app.config.get("DIFY_API_BASE_URL")
+    if not api_key or not DIFY_API_BASE_URL:
+        return {"answer": "Error: DIFY API settings not configured."}
+    
+    url = f"{DIFY_API_BASE_URL}/chat-messages"
+    headers = {"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"}
+    payload = {
+        "inputs": kwargs.get("inputs", {}),
+        "query": query,
+        "user": kwargs.get("user_id", "default-tk-user"),
+        "response_mode": kwargs.get("response_mode", "blocking"),
+        "conversation_id": kwargs.get("conversation_id")
+    }
+    try:
+        response = requests.post(url, headers=headers, json=payload, timeout=kwargs.get("timeout_seconds", 1200))
+        response.raise_for_status()
+        return response.json()
+    except requests.exceptions.RequestException as e:
+        return {"answer": f"Dify API request error: {e}"}
+
+def upload_chunk_to_dify(blob: bytes, filename="chunk.mp4"):
+    from flask import current_app
+    DIFY_API_BASE_URL = current_app.config.get("DIFY_API_BASE_URL")
+    API_KEY = current_app.config.get("DIFY_STT_API_KEY")
+    print(f"DEBUG: In upload_chunk_to_dify, using DIFY_STT_API_KEY: '{API_KEY}'") # FINAL DEBUG
+    
+    r = requests.post(
+        f"{DIFY_API_BASE_URL}/files/upload",
+        headers={"Authorization": f"Bearer {API_KEY}"},
+        files={"file": (filename, io.BytesIO(blob), "audio/mp4")},
+        data={"user": "ai-meeting-assistant-user"},
+        timeout=300
+    )
+    print("Dify File Upload API Response:", r.status_code, r.text) # DEBUG PRINT
+    r.raise_for_status()
+    return r.json()["id"]
+
+def run_dify_stt_chat_app(file_id: str) -> str:
+    """
+    透過呼叫 Dify 的 chat-messages API 來執行語音轉文字。
+    適用於「進階對話型」應用。
+    """
+    from flask import current_app
+    DIFY_API_BASE_URL = current_app.config.get("DIFY_API_BASE_URL")
+    API_KEY = current_app.config.get("DIFY_STT_API_KEY")
+
+    payload = {
+        "inputs": {},
+        "query": "請將音檔轉換為文字",
+        "user": "ai-meeting-assistant-user",
+        "response_mode": "blocking",
+        "files": [
+            {
+                "type": "audio",
+                "transfer_method": "local_file",
+                "upload_file_id": file_id
+            }
+        ]
+    }
+    
+    r = requests.post(
+        f"{DIFY_API_BASE_URL}/chat-messages",
+        headers={"Authorization": f"Bearer {API_KEY}", "Content-Type": "application/json"},
+        json=payload,
+        timeout=600
+    )
+    
+    print("Dify STT API Response:", r.status_code, r.text) # DEBUG PRINT
+    r.raise_for_status()
+    
+    j = r.json()
+    # 在對話型應用中，答案通常在 'answer' 欄位
+    return j.get("answer", "").strip()
+
+# --- Timestamp & Audio Chunking Helpers ---
+def format_timestamp_from_ms(ms: int) -> str:
+    td = timedelta(milliseconds=ms)
+    total_seconds = td.total_seconds()
+    hours, remainder = divmod(total_seconds, 3600)
+    minutes, seconds = divmod(remainder, 60)
+    milliseconds = td.microseconds // 1000
+    return f"{int(hours):02d}:{int(minutes):02d}:{int(seconds):02d}.{milliseconds:03d}"
+
+def export_audio_bytes(seg: AudioSegment) -> bytes:
+    buf = io.BytesIO()
+    seg.export(buf, format="mp4", bitrate="64k")
+    buf.seek(0)
+    return buf.read()
+
+def ensure_chunk_under_limits(seg: AudioSegment):
+    MAX_SEG_MS = 20 * 60 * 1000  # Max duration 20 minutes
+    MAX_BYTES = 24 * 1024 * 1024 # Dify file limit is 25MB, use 24MB as a safe buffer
+
+    if len(export_audio_bytes(seg)) < MAX_BYTES:
+        return [seg]
+
+    # If segment is too large, split by duration first
+    parts = []
+    start_ms = 0
+    while start_ms < len(seg):
+        end_ms = min(start_ms + MAX_SEG_MS, len(seg))
+        parts.append(seg[start_ms:end_ms])
+        start_ms = end_ms
+    
+    # Then, double-check byte size for each part
+    final_parts = []
+    for p in parts:
+        if len(export_audio_bytes(p)) < MAX_BYTES:
+            final_parts.append(p)
+        else:
+            # Fallback for rare cases: split in half until compliant
+            sub_parts = [p]
+            while sub_parts:
+                current_part = sub_parts.pop(0)
+                if len(export_audio_bytes(current_part)) < MAX_BYTES:
+                    final_parts.append(current_part)
+                    continue
+                
+                mid_point = len(current_part) // 2
+                if mid_point < 1000: # Stop splitting if it's less than a second
+                    final_parts.append(current_part)
+                    continue
+
+                sub_parts.extend([current_part[:mid_point], current_part[mid_point:]])
+    return final_parts
+
+# --- Celery Tasks ---
+@celery.task(base=ProgressTask, bind=True)
+def extract_audio_task(self, input_path, output_path):
+    try:
+        self.update_progress(0, 100, "Starting audio extraction...")
+        with VideoFileClip(input_path) as video:
+            video.audio.write_audiofile(output_path)
+        self.update_progress(100, 100, "Audio extracted successfully.")
+        return {'status': 'Success', 'result_path': output_path}
+    except Exception as e:
+        self.update_state(state='FAILURE', meta={'exc_type': type(e).__name__, 'exc_message': str(e)})
+
+@celery.task(base=ProgressTask, bind=True)
+def transcribe_audio_task(self, audio_path):
+    from app import app
+    with app.app_context():
+        try:
+            self.update_progress(0, 100, "Loading and preparing audio file...")
+            audio = AudioSegment.from_file(audio_path)
+
+            # 1. Split audio by silence
+            self.update_progress(5, 100, "Detecting silence to split audio into chunks...")
+            chunks = split_on_silence(
+                audio,
+                min_silence_len=700,
+                silence_thresh=-40,
+                keep_silence=300
+            )
+            if not chunks: # If no silence is detected, treat the whole audio as one chunk
+                chunks = [audio]
+
+            # 2. Process chunks and ensure they are within API limits
+            final_segments = []
+            cursor_ms = 0
+            for chunk in chunks:
+                start_time = cursor_ms
+                end_time = start_time + len(chunk)
+                
+                safe_parts = ensure_chunk_under_limits(chunk)
+                part_start_time = start_time
+                for part in safe_parts:
+                    part_end_time = part_start_time + len(part)
+                    final_segments.append({
+                        "start": part_start_time,
+                        "end": part_end_time,
+                        "segment": part
+                    })
+                    part_start_time = part_end_time
+                cursor_ms = end_time
+
+            # 3. Upload chunks to Dify and get transcriptions
+            transcribed_lines = []
+            total_segments = len(final_segments)
+            for i, seg_data in enumerate(final_segments):
+                progress = 10 + int((i / total_segments) * 85)
+                self.update_progress(progress, 100, f"Processing chunk {i+1} of {total_segments}...")
+                
+                audio_bytes = export_audio_bytes(seg_data["segment"])
+                file_id = upload_chunk_to_dify(audio_bytes, f"chunk_{i+1}.mp4")
+                transcribed_text = run_dify_stt_chat_app(file_id).strip()
+
+                if transcribed_text:
+                    start_ts = format_timestamp_from_ms(seg_data["start"])
+                    end_ts = format_timestamp_from_ms(seg_data["end"])
+                    transcribed_lines.append(f"[{start_ts} - {end_ts}] {transcribed_text}")
+
+            # 4. Finalize and save the result
+            self.update_progress(98, 100, "Finalizing transcript...")
+            full_content = "\n".join(transcribed_lines)
+            
+            transcript_filename = f"transcript_{uuid.uuid4()}.txt"
+            output_txt_path = os.path.join(app.config['UPLOAD_FOLDER'], transcript_filename)
+            with open(output_txt_path, "w", encoding="utf-8") as f:
+                f.write(full_content)
+            
+            self.update_progress(100, 100, "Transcription complete.")
+            return {'status': 'Success', 'content': full_content, 'result_path': transcript_filename}
+
+        except Exception as e:
+            error_message = f"An error occurred: {str(e)}"
+            self.update_state(
+                state='FAILURE',
+                meta={'exc_type': type(e).__name__, 'exc_message': error_message}
+            )
+            return {'status': 'Error', 'error': error_message}
+
+@celery.task(base=ProgressTask, bind=True)
+def translate_text_task(self, text_content, target_language):
+    from app import app
+    with app.app_context():
+        from services.dify_client import translate_text as dify_translate
+        try:
+            self.update_progress(0, 100, f"Starting translation to {target_language}...")
+            if isinstance(text_content, dict):
+                text_content = text_content.get('content', '')
+
+            if not text_content or not isinstance(text_content, str):
+                self.update_progress(100, 100, "Translation skipped due to empty input.")
+                return {'status': 'Success', 'content': '', 'result_path': None, 'message': 'Input was empty.'}
+
+            lines = text_content.strip().split('\n')
+            final_content = ""
+            
+            timestamp_pattern = re.compile(r'^(\s*\[\d{2}:\d{2}:\d{2}\.\d{3}\s-\s\d{2}:\d{2}:\d{2}\.\d{3}\])\s*(.*)')
+            
+            is_timestamped_input = False
+            if lines:
+                if timestamp_pattern.match(lines[0]):
+                    is_timestamped_input = True
+
+            if is_timestamped_input:
+                translated_lines = []
+                total_lines = len(lines)
+                for i, line in enumerate(lines):
+                    match = timestamp_pattern.match(line)
+                    if not match:
+                        if line.strip(): # Keep non-matching, non-empty lines
+                            translated_lines.append(line)
+                        continue
+
+                    timestamp = match.group(1)
+                    original_text = match.group(2)
+                    
+                    # Add original line
+                    translated_lines.append(line)
+
+                    if not original_text.strip():
+                        continue
+
+                    translated_text = dify_translate(text=original_text, target_lang=target_language)
+                    # Add translated line, preserving the timestamp
+                    translated_lines.append(f"{timestamp} {translated_text}")
+                    
+                    progress = int(((i + 1) / total_lines) * 100)
+                    self.update_progress(progress, 100, f"Translating line {i+1}/{total_lines}...")
+                
+                final_content = "\n".join(translated_lines)
+            else:
+                # Handle non-timestamped text line by line for bilingual output
+                translated_lines = []
+                total_lines = len(lines)
+                for i, line in enumerate(lines):
+                    progress = int(((i + 1) / total_lines) * 98) # Leave some room for finalization
+                    self.update_progress(progress, 100, f"Translating line {i+1}/{total_lines}...")
+                    
+                    original_line = line.strip()
+                    if not original_line:
+                        continue
+
+                    translated_text = dify_translate(text=original_line, target_lang=target_language)
+                    translated_lines.append(original_line)
+                    translated_lines.append(translated_text)
+                    translated_lines.append("") # Add a blank line for readability
+                
+                final_content = "\n".join(translated_lines)
+
+            translated_filename = f"translated_{uuid.uuid4()}.txt"
+            upload_folder = app.config.get('UPLOAD_FOLDER', 'uploads')
+            output_txt_path = os.path.join(upload_folder, translated_filename)
+            
+            os.makedirs(upload_folder, exist_ok=True)
+            with open(output_txt_path, "w", encoding="utf-8") as f:
+                f.write(final_content)
+                
+            self.update_progress(100, 100, "Translation complete.")
+            return {'status': 'Success', 'content': final_content, 'result_path': translated_filename}
+        except Exception as e:
+            self.update_state(
+                state='FAILURE',
+                meta={'exc_type': type(e).__name__, 'exc_message': str(e)}
+            )
+
+@celery.task(bind=True)
+def summarize_text_task(self, meeting_id):
+    from app import app
+    with app.app_context():
+        try:
+            meeting = Meeting.query.get(meeting_id)
+            if not meeting or not meeting.transcript:
+                self.update_state(state='FAILURE', meta={'error': 'Meeting or transcript not found'})
+                return {'status': 'Error', 'error': 'Meeting or transcript not found'}
+
+            api_key = app.config.get("DIFY_SUMMARIZER_API_KEY")
+            plain_transcript = re.sub(r'^(\s*\[.*?\])\s*', '', meeting.transcript, flags=re.MULTILINE)
+            
+            if not plain_transcript.strip():
+                self.update_state(state='FAILURE', meta={'error': 'Transcript is empty.'})
+                return {'status': 'Error', 'error': 'Transcript is empty'}
+
+            response = ask_dify(api_key, plain_transcript)
+            summary = response.get("answer")
+
+            if not summary:
+                 self.update_state(state='FAILURE', meta={'error': 'Dify returned empty summary.'})
+                 return {'status': 'Error', 'error': 'Dify returned empty summary.'}
+
+            meeting.summary = summary
+            db.session.commit()
+            
+            return {'status': 'Success', 'summary': summary}
+        except Exception as e:
+            db.session.rollback()
+            self.update_state(
+                state='FAILURE',
+                meta={'exc_type': type(e).__name__, 'exc_message': str(e)}
+            )
+            return {'status': 'Error', 'error': str(e)}
+
+@celery.task(base=ProgressTask, bind=True)
+def preview_action_items_task(self, text_content):
+    from app import app
+    with app.app_context():
+        try:
+            self.update_progress(10, 100, "Requesting Dify for action items...")
+            api_key = app.config.get("DIFY_ACTION_EXTRACTOR_API_KEY")
+            plain_text = re.sub(r'^(\s*\[.*?\])\s*', '', text_content, flags=re.MULTILINE)
+            response = ask_dify(api_key, plain_text)
+            answer_text = response.get("answer", "")
+            self.update_progress(80, 100, "Parsing response...")
+            parsed_items = []
+            try:
+                match = re.search(r'\[.*\]', answer_text, re.DOTALL)
+                if match:
+                    json_str = match.group(0)
+                    parsed_items = json.loads(json_str)
+                if not isinstance(parsed_items, list):
+                    parsed_items = []
+            except (json.JSONDecodeError, TypeError):
+                parsed_items = []
+            self.update_progress(100, 100, "Action item preview generated.")
+            return {'status': 'Success', 'parsed_items': parsed_items}
+        except Exception as e:
+            self.update_state(
+                state='FAILURE',
+                meta={'exc_type': type(e).__name__, 'exc_message': str(e)}
+            )
+
+@celery.task(bind=True)
+def process_meeting_flow(self, meeting_id, target_language=None):
+    from app import app
+    with app.app_context():
+        meeting = Meeting.query.get(meeting_id)
+        if not meeting:
+            return {'status': 'Error', 'error': 'Meeting not found'}
+        try:
+            meeting.status = 'processing'
+            db.session.commit()
+            
+            upload_folder = app.config['UPLOAD_FOLDER']
+            # Assuming filename exists on the meeting object
+            audio_path = os.path.join(upload_folder, meeting.filename.replace('.mp4', '.wav'))
+
+            # The call to transcribe_audio_task needs to be updated as it no longer takes 'language'
+            transcript_result = transcribe_audio_task.apply(args=[audio_path]).get()
+            if transcript_result.get('status') != 'Success':
+                raise Exception(f"Transcription failed: {transcript_result.get('error', 'Unknown error')}")
+            
+            meeting.transcript = transcript_result['content']
+            db.session.commit()
+
+            if target_language:
+                translation_result = translate_text_task.apply(args=[meeting.transcript, target_language]).get()
+                if translation_result.get('status') != 'Success':
+                    raise Exception(f"Translation failed: {translation_result.get('error', 'Unknown error')}")
+                meeting.translated_transcript = translation_result['content']
+                db.session.commit()
+
+            summary_result = summarize_text_task.apply(args=[meeting.id]).get()
+            if summary_result.get('status') != 'Success':
+                raise Exception(f"Summarization failed: {summary_result.get('error', 'Unknown error')}")
+            
+            meeting.summary = summary_result['summary']
+            meeting.status = 'completed'
+            db.session.commit()
+            return {'status': 'Success', 'meeting_id': meeting.id}
+        except Exception as e:
+            meeting.status = 'failed'
+            db.session.commit()
+            return {'status': 'Error', 'error': str(e)}
--- a/templates/index.html
+++ b/templates/index.html
@@ -0,0 +1,168 @@
+<!DOCTYPE html>
+<html lang="zh-TW">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>AI Meeting Assistant</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css">
+    <link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
+</head>
+<body>
+    <div class="container mt-4 mb-4">
+        <header class="text-center mb-4">
+            <h1 class="display-5"><i class="bi bi-robot me-2"></i>AI 會議助手</h1>
+            <p class="lead text-muted">一個強大的工具，用於轉錄、翻譯和總結您的會議內容。</p>
+        </header>
+
+        <div class="card shadow-sm">
+            <div class="card-header">
+                <ul class="nav nav-tabs card-header-tabs" id="myTab" role="tablist">
+                    <li class="nav-item" role="presentation">
+                        <button class="nav-link active" id="tab1-tab" data-bs-toggle="tab" data-bs-target="#tab1" type="button" role="tab" aria-controls="tab1" aria-selected="true"><i class="bi bi-film me-1"></i> 1. 影片轉音訊</button>
+                    </li>
+                    <li class="nav-item" role="presentation">
+                        <button class="nav-link" id="tab2-tab" data-bs-toggle="tab" data-bs-target="#tab2" type="button" role="tab" aria-controls="tab2" aria-selected="false"><i class="bi bi-mic-fill me-1"></i> 2. 音訊轉文字</button>
+                    </li>
+                    <li class="nav-item" role="presentation">
+                        <button class="nav-link" id="tab3-tab" data-bs-toggle="tab" data-bs-target="#tab3" type="button" role="tab" aria-controls="tab3" aria-selected="false"><i class="bi bi-translate me-1"></i> 3. 逐段翻譯</button>
+                    </li>
+                    <li class="nav-item" role="presentation">
+                        <button class="nav-link" id="tab4-tab" data-bs-toggle="tab" data-bs-target="#tab4" type="button" role="tab" aria-controls="tab4" aria-selected="false"><i class="bi bi-card-text me-1"></i> 4. 會議結論</button>
+                    </li>
+                </ul>
+            </div>
+            <div class="card-body">
+                <div class="tab-content" id="myTabContent">
+                    <!-- Tab 1: Video to Audio -->
+                    <div class="tab-pane fade show active" id="tab1" role="tabpanel" aria-labelledby="tab1-tab">
+                        <h5 class="card-title">影片轉音訊 (.wav)</h5>
+                        <p class="card-text">從影片檔案中提取音軌，以便進行後續處理。</p>
+                        <div class="mb-3">
+                            <label for="video-file" class="form-label">選擇影片檔案 (.mp4, .mov, .avi):</label>
+                            <input class="form-control" type="file" id="video-file" accept=".mp4,.mov,.avi">
+                        </div>
+                        <button class="btn btn-primary w-100 action-btn" data-task="extract_audio"><i class="bi bi-arrow-repeat me-2"></i>開始轉換</button>
+                    </div>
+
+                    <!-- Tab 2: Audio to Text -->
+                    <div class="tab-pane fade" id="tab2" role="tabpanel" aria-labelledby="tab2-tab">
+                        <h5 class="card-title">音訊轉文字 (Whisper)</h5>
+                        <p class="card-text">將音訊檔案轉錄成帶有時間戳的逐字稿。</p>
+                        <div class="mb-3">
+                            <label for="audio-file" class="form-label">選擇音訊檔案 (.mp3, .wav, .m4a):</label>
+                            <input class="form-control" type="file" id="audio-file" accept=".mp3,.wav,.m4a">
+                        </div>
+                        <div class="row">
+                            <div class="col-md-6 mb-3">
+                                <label for="lang-select" class="form-label">音訊語言:</label>
+                                <select id="lang-select" class="form-select">
+                                    <option value="auto">自動偵測</option>
+                                    <option value="zh">中文</option><option value="en">英文</option>
+                                    <option value="ja">日文</option><option value="ko">韓文</option>
+                                    <option value="vi">越南文</option>
+                                </select>
+                            </div>
+                        </div>
+                        <div class="form-check form-switch mb-3">
+                            <input class="form-check-input" type="checkbox" role="switch" id="use-demucs">
+                            <label class="form-check-label" for="use-demucs">啟用 AI 人聲分離 (適用於嘈雜音訊)</label>
+                        </div>
+                        <button class="btn btn-primary w-100 action-btn" data-task="transcribe_audio"><i class="bi bi-mic-fill me-2"></i>開始轉錄</button>
+                    </div>
+
+                    <!-- Tab 3: Translate Text -->
+                    <div class="tab-pane fade" id="tab3" role="tabpanel" aria-labelledby="tab3-tab">
+                        <h5 class="card-title">逐段翻譯 (Dify)</h5>
+                        <p class="card-text">將逐字稿檔案進行逐段對照翻譯。</p>
+                        <div class="mb-3">
+                            <label for="transcript-file" class="form-label">選擇逐字稿檔案 (.txt):</label>
+                            <input class="form-control" type="file" id="transcript-file" accept=".txt">
+                        </div>
+                        <div class="mb-3">
+                            <label for="translate-lang-select" class="form-label">目標翻譯語言:</label>
+                            <select id="translate-lang-select" class="form-select">
+                                <option value="Traditional Chinese (繁體中文)">繁體中文</option>
+                                <option value="Simplified Chinese (简体中文)">簡體中文</option>
+                                <option value="English">English</option>
+                                <option value="Japanese (日本語)">日本語</option>
+                                <option value="Korean (한국어)">한국어</option>
+                                <option value="Vietnamese (Tiếng Việt)">Tiếng Việt (越南文)</option>
+                                <option value="French (Français)">Français (法文)</option>
+                                <option value="German (Deutsch)">Deutsch (德文)</option>
+                                <option value="Spanish (Español)">Español (西班牙文)</option>
+                            </select>
+                        </div>
+                        <button class="btn btn-primary w-100 action-btn" data-task="translate_text"><i class="bi bi-translate me-2"></i>開始翻譯</button>
+                    </div>
+
+                    <!-- Tab 4: Summarize Text -->
+                    <div class="tab-pane fade" id="tab4" role="tabpanel" aria-labelledby="tab4-tab">
+                        <h5 class="card-title">會議結論整理 (Dify)</h5>
+                        <p class="card-text">從逐字稿或貼上的文字中生成會議摘要。</p>
+                        <div class="mb-3">
+                            <label for="summary-file-input" class="form-label">上傳文稿檔案 (.txt):</label>
+                            <input class="form-control" type="file" id="summary-file-input" accept=".txt">
+                        </div>
+                        <div class="mb-3">
+                            <label for="summary-source-text" class="form-label">或直接貼上文稿:</label>
+                            <textarea id="summary-source-text" class="form-control" rows="6" placeholder="請在此處貼上要總結的完整文字... (如果已選擇檔案，將優先使用檔案內容)"></textarea>
+                        </div>
+                        <div class="mb-3">
+                            <label for="summary-lang-select" class="form-label">結論生成語言:</label>
+                            <select id="summary-lang-select" class="form-select">
+                                <option value="Traditional Chinese (繁體中文)">繁體中文</option>
+                                <option value="Simplified Chinese (简体中文)">簡體中文</option>
+                                <option value="English">English</option>
+                                <option value="Japanese (日本語)">日本語</option>
+                                <option value="Korean (한국어)">한국어</option>
+                                <option value="Vietnamese (Tiếng Việt)">Tiếng Việt (越南文)</option>
+                                <option value="French (Français)">Français (法文)</option>
+                                <option value="German (Deutsch)">Deutsch (德文)</option>
+                                <option value="Spanish (Español)">Español (西班牙文)</option>
+                            </select>
+                        </div>
+                        <button class="btn btn-primary w-100 action-btn" data-task="summarize_text"><i class="bi bi-card-text me-2"></i>產生初版結論</button>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <!-- Progress and Result Section -->
+        <div id="progress-container" class="mt-4" style="display: none;">
+            <div class="card shadow-sm">
+                <div class="card-body">
+                    <h5 class="card-title">處理進度</h5>
+                    <p id="status-text" class="text-muted mb-2">等待中...</p>
+                    <div class="progress" style="height: 25px;">
+                        <div id="progress-bar" class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" style="width: 0%;" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100">0%</div>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div id="result-container" class="mt-4" style="display: none;">
+            <div class="card shadow-sm">
+                <div class="card-body">
+                    <h5 class="card-title">處理結果</h5>
+                    <div id="text-result-preview" class="result-preview bg-light p-3 rounded border" style="display: none;"></div>
+                    <a id="download-link" href="#" class="btn btn-success mt-3" style="display: none;"><i class="bi bi-download me-2"></i>下載結果檔案</a>
+                    
+                    <!-- Revision Area -->
+                    <div id="revision-area" class="mt-4 pt-3 border-top" style="display:none;">
+                        <h6 class="card-subtitle mb-2 text-muted">不滿意結果嗎？</h6>
+                        <div class="mb-3">
+                            <label for="revision-instruction" class="form-label"><strong>修改指示:</strong></label>
+                            <textarea id="revision-instruction" class="form-control" rows="3" placeholder="請輸入修改要求，例如：請將結論縮減到 3 個重點。"></textarea>
+                        </div>
+                        <button class="btn btn-secondary w-100 action-btn" data-task="revise_summary"><i class="bi bi-pencil-square me-2"></i>根據指示產生修改版</button>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
+    <script src="{{ url_for('static', filename='js/script.js') }}"></script>
+</body>
+</html>
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