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/app/(app)/pairing.tsx

@@ -145,7 +145,7 @@ export default function PairingScreen() {
         if (couple?.invite_code) {
             try {
                 await Share.share({
-                    message: `Join me on Sauci! Use my invite code to pair up: ${couple.invite_code}`,
+                    message: `Join me on Sauci! Download the app at https://sauci.app and use my invite code to pair up: ${couple.invite_code}`,
                 });
                 Events.codeShared();
             } catch (error) {