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

Procfile

@@ -1,13 +1 @@
-web: cd backend && ALWRITY_ENABLED_FEATURES=podcast python -c "
-import os
-import sys
-# Ensure podcast mode
-os.environ.setdefault('ALWRITY_ENABLED_FEATURES', 'podcast')
-# Set HOST/PORT for Render
-port = os.getenv('PORT', '10000')
-host = os.getenv('HOST', '0.0.0.0')
-print(f'[STARTUP] Starting uvicorn on {host}:{port}', flush=True)
-sys.stdout.flush()
-import uvicorn
-uvicorn.run('app:app', host=host, port=int(port), reload=False)
-"
+web: cd backend && python start_alwrity_backend.py --production