fix: Browser mode 404 error for meeting-detail page

- Preserve query parameters (e.g., ?id=123) when opening in browser
- Add packaged mode detection for CLIENT_DIR path resolution
- Include client files in extraResources for backend to serve
- Add debug logging for client directory detection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/main.py

@@ -11,10 +11,23 @@ from .routers import auth, meetings, ai, export, sidecar
 from .sidecar_manager import get_sidecar_manager
 
 # Determine client directory path
+# In development: backend/../client/src
+# In packaged mode: backend/backend/_internal/../../client (relative to backend executable)
 BACKEND_DIR = Path(__file__).parent.parent
 PROJECT_DIR = BACKEND_DIR.parent
 CLIENT_DIR = PROJECT_DIR / "client" / "src"
 
+# Check for packaged mode (PyInstaller sets _MEIPASS)
+import sys
+if getattr(sys, 'frozen', False):
+    # Packaged mode: look for client folder relative to executable
+    # Backend runs from resources/backend/, client files at resources/backend/client/
+    EXEC_DIR = Path(sys.executable).parent.parent  # up from backend/backend.exe
+    CLIENT_DIR = EXEC_DIR / "client"
+    print(f"[Backend] Packaged mode: CLIENT_DIR={CLIENT_DIR}")
+else:
+    print(f"[Backend] Development mode: CLIENT_DIR={CLIENT_DIR}")
+
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
@@ -77,6 +90,7 @@ async def health_check():
 # ========================================
 
 # Check if client directory exists for browser mode
+print(f"[Backend] CLIENT_DIR exists: {CLIENT_DIR.exists()}")
 if CLIENT_DIR.exists():
     # Serve static assets (CSS, JS, etc.)
     app.mount("/styles", StaticFiles(directory=CLIENT_DIR / "styles"), name="styles")