feat: Add Web Push notifications and multiple UX improvements

- Add PWA manifest and service worker for push notifications
- Implement VAPID key generation and push subscription management
- Add push notification API endpoints (/api/push/*)
- Add push_subscriptions table to database schema
- Update notification settings UI with push support and iOS hints
- Fix translation issue showing "{ task } created" - add missing keys
- Fix mobile sidebar visibility for iOS home screen app
- Change default task filter from "all" to "open" (excludes done tasks)
- Add "Open" filter option to show only todo + inProgress tasks

package.json

@@ -86,6 +86,7 @@
     "tw-animate-css": "^1.2.5",
     "vaul": "^1.1.2",
     "vite-plugin-pwa": "^1.2.0",
+    "web-push": "^3.6.7",
     "wouter": "^3.3.5",
     "ws": "^8.18.0",
     "zod": "^3.24.2",
@@ -106,6 +107,7 @@
     "@types/passport-local": "^1.0.38",
     "@types/react": "^18.3.11",
     "@types/react-dom": "^18.3.1",
+    "@types/web-push": "^3.6.4",
     "@types/ws": "^8.5.13",
     "@vitejs/plugin-react": "^4.3.2",
     "autoprefixer": "^10.4.20",