fix: WYSIWYG editor, content generation, and writing assistant bug fixes

- Fix text selection menu not showing: wire contentRef via inputRef on multiline TextField
- Fix blog title not truncating: add min-w-0 for flex item overflow
- Fix outline generation 500: escape curly braces in f-string prompt template
- Fix content generation 'NoneType not callable': replace SessionLocal() with get_session_for_user(), add db param to MediumBlogGenerator, fix signature mismatch in database_task_manager
- Fix writing assistant suggest 500: add auth + user_id to API endpoint and service, replace sync requests with httpx.AsyncClient
- Fix hallucination detector 404: explicitly include router in main.py and app.py
- Fix missing error_data in task failure responses
- Hide CopilotKit web inspector button
- Remove hardcoded fallback suggestions from SmartTypingAssist
- Fix stale closure refs in SmartTypingAssist handleTypingChange
- Add two-column editor layout, stats bar, section hover menu
- Various subscription, billing, and research module improvements

backend/main.py

@@ -252,6 +252,8 @@ router_manager.include_core_routers()
 # Safety net: keep subscription routes available even if core inclusion flow changes
 # in special modes (e.g., demo mode). De-dup is handled by RouterManager.
 router_manager.include_router_safely(subscription_router, "subscription")
+# Include hallucination detector explicitly (router_manager may skip silently on import failure)
+router_manager.include_router_safely(hallucination_detector_router, "hallucination_detector")
 router_manager.include_optional_routers()
 
 # SEO Dashboard endpoints