feat: enable reading position sync by default

- Changed syncReadingPosition default from false to true in Settings.tsx
- Users can still disable it in settings if they prefer
- This ensures reading progress tracking works out of the box

src/components/Settings.tsx

@@ -39,7 +39,7 @@ const DEFAULT_SETTINGS: UserSettings = {
   useLocalRelayAsCache: true,
   rebroadcastToAllRelays: false,
   paragraphAlignment: 'justify',
-  syncReadingPosition: false,
+  syncReadingPosition: true,
 }
 
 interface SettingsProps {