feat: Streak-Reminder – In-App-Nudge + lokale Tages-Erinnerung

- streak.js: Zustand aus last_practice_at (safe/at_risk/broken/none)
- Feed: Loss-Aversion-Bar "X-Tage-Serie – nur noch Y Std heute!" wenn die Serie heute abläuft
- Profil-Streak-Zeile zeigt Status (heute gesichert ✓ / noch X Std)
- Lokale Tages-Erinnerung via @capacitor/local-notifications (kein APNs nötig),
  geplant bei Login, abgebrochen sobald heute geübt – nativ; web no-op

Hinweis: nativ erst nach 'npx cap sync ios' + Rebuild aktiv.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -1 +1 @@
-{"name":"snakkimo","version":"1.0.0","type":"module","scripts":{"dev":"vite","build":"vite build","preview":"vite preview"},"dependencies":{"@capacitor/cli":"^8.4.0","@capacitor/core":"^8.4.0","@capacitor/ios":"^8.4.0","canvas-confetti":"^1.9.4","capacitor-secure-storage-plugin":"^0.13.0","react":"^19.0.0","react-dom":"^19.0.0"},"devDependencies":{"@types/react":"^19.0.0","@types/react-dom":"^19.0.0","@vitejs/plugin-react":"^4.3.4","vite":"^6.3.1"}}
+{"name":"snakkimo","version":"1.0.0","type":"module","scripts":{"dev":"vite","build":"vite build","preview":"vite preview"},"dependencies":{"@capacitor/cli":"^8.4.0","@capacitor/core":"^8.4.0","@capacitor/ios":"^8.4.0","@capacitor/local-notifications":"^8.2.0","canvas-confetti":"^1.9.4","capacitor-secure-storage-plugin":"^0.13.0","react":"^19.0.0","react-dom":"^19.0.0"},"devDependencies":{"@types/react":"^19.0.0","@types/react-dom":"^19.0.0","@vitejs/plugin-react":"^4.3.4","vite":"^6.3.1"}}