- Add GeneralSettingsPage for language, privacy, and notification settings
- Add FeedbackPage for user feedback submission with image upload
- Connect settings to backend PATCH /users/me/settings API
- Implement language preference sync between frontend and backend
- Update login flow to pass language preference and redirect based on user settings
- Add Astro entry pages for /settings/general and /settings/feedback routes
- Update sidebar navigation: language button links to general settings
- Fix account data card to link to profile page
- Remove "deletion" text from account data description