Add discovery UI, hide NSFW setting, and pack progress

- New discovery components (ContentTile, ContentRow, CircularProgress)
- Refactor home screen with compact header and content tiles
- Add hide_nsfw profile setting for content filtering
- Add color column to categories table
- Track pack progress (answered/total questions)
- Update related stores and tests

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/mobile/package.json

@@ -64,6 +64,7 @@
     "react-native-reanimated": "~3.16.0",
     "react-native-safe-area-context": "4.12.0",
     "react-native-screens": "~4.4.0",
+    "react-native-svg": "15.8.0",
     "react-native-url-polyfill": "^2.0.0",
     "react-native-web": "~0.19.13",
     "zustand": "^4.4.7"