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

frontend/src/components/shared/UserBadge.tsx

@@ -4,12 +4,13 @@ import { useUser, useClerk } from '@clerk/clerk-react';
 import { useSubscription } from '../../contexts/SubscriptionContext';
 import SystemStatusIndicator from '../ContentPlanningDashboard/components/SystemStatusIndicator';
 import UsageDashboard from './UsageDashboard';
-import { isPodcastOnlyDemoMode } from '../../utils/demoMode';
+import { isFeatureOnlyMode } from '../../utils/demoMode';
 import {
   apiClient,
   isBackendCooldownActive,
   logBackendCooldownSkipOnce,
 } from '../../api/client';
+import { saveNavigationState } from '../../utils/navigationState';
 
 interface UserBadgeProps {
   colorMode?: 'light' | 'dark';
@@ -31,8 +32,8 @@ const UserBadge: React.FC<UserBadgeProps> = ({ colorMode = 'light' }) => {
 
   // Fetch system status for status bulb
   useEffect(() => {
-    // Skip system status checks in podcast-only mode (endpoint not available)
-    if (isPodcastOnlyDemoMode()) {
+    // Skip system status checks in feature-limited mode (endpoint not available)
+    if (isFeatureOnlyMode()) {
       setSystemStatus('unknown');
       return;
     }
@@ -254,7 +255,7 @@ const UserBadge: React.FC<UserBadgeProps> = ({ colorMode = 'light' }) => {
         
         <Divider sx={{ mx: 2 }} />
         
-        <MenuItem onClick={() => { handleClose(); window.location.href = '/pricing'; }} sx={{ mx: 1, borderRadius: 1, color: '#374151', '&:hover': { bgcolor: '#f3f4f6' } }}>
+        <MenuItem onClick={() => { handleClose(); saveNavigationState(window.location.pathname); window.location.href = '/pricing'; }} sx={{ mx: 1, borderRadius: 1, color: '#374151', '&:hover': { bgcolor: '#f3f4f6' } }}>
           Manage Subscription
         </MenuItem>
         <MenuItem onClick={handleSignOut} sx={{ mx: 1, borderRadius: 1, color: '#6b7280', '&:hover': { bgcolor: '#fef2f2', color: '#ef4444' } }}>