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/services/blog_writer/content/medium_blog_generator.py

@@ -9,6 +9,7 @@ import json
 from typing import Dict, Any, List
 from loguru import logger
 from fastapi import HTTPException
+from sqlalchemy.orm import Session
 
 from models.blog_models import (
     MediumBlogGenerateRequest,
@@ -26,7 +27,7 @@ class MediumBlogGenerator:
     def __init__(self):
         self.cache = persistent_content_cache
     
-    async def generate_medium_blog_with_progress(self, req: MediumBlogGenerateRequest, task_id: str, user_id: str) -> MediumBlogGenerateResult:
+    async def generate_medium_blog_with_progress(self, req: MediumBlogGenerateRequest, task_id: str, user_id: str, db: Session = None) -> MediumBlogGenerateResult:
         """Use Gemini structured JSON to generate a medium-length blog in one call.
         
         Args: