- Add `isNsfw` checkbox to compose screen for user self-labeling
- Add `nsfwBlurEnabled` setting to UserSettings model (default true)
- Replace signup month/year dropdowns with modal bottom sheet pickers
- Preload Noto Color Emoji font on app startup
- Refactor notifications/discover screens to use FullScreenShell component
- Replace NULLIF with CASE WHEN for proper UUID casting
- Fix missing ::uuid casting in WHERE clauses
- Resolve 'operator does not exist: uuid = text' errors
- Focus on post_repository.go, notification_repository.go, and category_repository.go