docs: add PWA implementation guide and git workflow notes

- Document PWA feature with testing instructions
- Add Git workflow: push after every task completion
- Document iPhone testing steps

AGENTS.md

@@ -1181,6 +1181,49 @@ CORS_ALLOWED_ORIGINS=http://localhost:3000,http://127.0.0.1:3000
 
 ---
 
+## Git Workflow
+
+**IMPORTANT: Push after EVERY task completion**
+
+When implementing features, push to Gitea after completing each individual task:
+
+```bash
+# After each task completion
+git add -A
+git commit -m "feat(scope): description"
+git push origin feature/branch-name
+```
+
+**Why:**
+- Prevents loss of work
+- Enables testing on multiple devices (e.g., iPhone testing requires network-accessible code)
+- Allows rollback if issues arise
+- Keeps Gitea in sync with local progress
+
+---
+
+## PWA Implementation (COMPLETED)
+
+**Branch:** `feature/pwa`
+
+### What was implemented:
+1. **manifest.json** - PWA configuration with icons, theme colors, display mode
+2. **App Icons** - 192x192, 512x512, Apple Touch (180x180), Maskable
+3. **Meta Tags** - viewport-fit: cover, theme-color, apple-web-app-capable
+4. **Mobile CSS** - Safe areas, touch targets (44x44px), standalone mode styles
+5. **InstallPrompt Component** - "Add to Home Screen" banner for iOS/Android
+6. **dev:host Script** - `npm run dev:host` for network testing
+7. **Network Config** - `.env.local` with API URL on 192.168.168.101.111
+
+### Testing PWA on iPhone:
+1. Start backend: `python manage.py runserver 0.0.0.0:8000`
+2. Start frontend: `npm run dev:host` (or `npm start` after build)
+3. Open Safari → http://192.168.101.111:3000
+4. Tap "Teilen" → "Zum Home Screen hinzufügen"
+5. App runs standalone without Safari UI
+
+---
+
 ## Security Notes
 
 - Rate limiting on auth endpoints (5/minute)