fix: critical issues - settings sync, error handling, bookmarks persistence

- Fix settings synchronization: ReadingView now listens to storage events for real-time preference updates
- Add comprehensive error handling to loadChapter with proper state management
- Add comprehensive error handling to loadBooks with booksLoading state
- Add localStorage persistence for bookmarks (load on mount, save on change)
- Display error messages in UI with reload button and proper loading states

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

components/bible/reading-view.tsx

@@ -32,7 +32,14 @@ export function ReadingView({
   const [showControls, setShowControls] = useState(!isMobile)
 
   useEffect(() => {
+    const handleStorageChange = () => {
+      setPreferences(loadPreferences())
+    }
+
     setPreferences(loadPreferences())
+    window.addEventListener('storage', handleStorageChange)
+
+    return () => window.removeEventListener('storage', handleStorageChange)
   }, [])
 
   const cssVars = getCSSVariables(preferences)