Add supplements, kettlebell, calendar, push notifications, and PWA support

- Supplement tracking: CRUD endpoints, /today, /logs, Supplements page
- Kettlebell workouts: session tracking, analytics endpoint, ActiveSession page
- Calendar module: events CRUD, calendar components
- Push notifications: VAPID keys, PushSubscription model, APScheduler reminders,
  service worker with push/notificationclick handlers, Profile notifications UI
- PWA: vite-plugin-pwa, manifest, icons, service worker generation
- Frontend: TypeScript types, API modules, ConfirmModal, toast notifications
- Auth fixes: password hashing, nutrition endpoint auth
- CLAUDE.md: project documentation and development guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -14,10 +14,12 @@
     "lucide-react": "^0.562.0",
     "motion": "^12.27.0",
     "react": "^19.2.0",
+    "react-day-picker": "^9.14.0",
     "react-dom": "^19.2.0",
     "react-markdown": "^10.1.0",
     "react-router-dom": "^7.12.0",
-    "recharts": "^3.6.0"
+    "recharts": "^3.6.0",
+    "sonner": "^2.0.7"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.1",
@@ -35,6 +37,7 @@
     "tailwind-merge": "^3.4.0",
     "tailwindcss": "^4.1.18",
     "typescript": "^5.9.3",
-    "vite": "^7.2.4"
+    "vite": "^7.2.4",
+    "vite-plugin-pwa": "^1.2.0"
   }
 }