feat(modernization): promote deferred routes to in-scope and unify page header styles

Promote /tables, /excel-query, /query-tool, /mid-section-defect from
deferred to full shell-governed in-scope routes with canonical redirects,
content contracts, governance artifacts, and updated CI gates.

Unify all page header gradients to #667eea → #764ba2 and h1 font-size
to 24px for visual consistency across all dashboard pages. Remove
Native Route-View dev annotations from job-query, excel-query, and
query-tool headers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_query_tool_routes.py

@@ -28,17 +28,19 @@ def client(app):
     return app.test_client()
 
 
-class TestQueryToolPage:
-    """Tests for /query-tool page route."""
-
-    def test_page_returns_html(self, client):
-        """Should return the query tool page."""
-        with client.session_transaction() as sess:
-            sess["admin"] = {"username": "admin", "displayName": "Admin"}
-
-        response = client.get('/query-tool')
-        assert response.status_code == 200
-        assert b'html' in response.data.lower()
+class TestQueryToolPage:
+    """Tests for /query-tool page route."""
+
+    def test_page_returns_html(self, client, monkeypatch):
+        """Should return the query tool page when SPA redirect is disabled."""
+        monkeypatch.setenv("PORTAL_SPA_ENABLED", "false")
+        client.application.config["PORTAL_SPA_ENABLED"] = False
+        with client.session_transaction() as sess:
+            sess["admin"] = {"username": "admin", "displayName": "Admin"}
+
+        response = client.get('/query-tool')
+        assert response.status_code == 200
+        assert b'html' in response.data.lower()
 
 
 class TestResolveEndpoint: