add pwa

frontend/package.json

@@ -23,6 +23,7 @@
     "@types/node": "^24.12.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
+    "@types/workbox-window": "^4.3.4",
     "@vitejs/plugin-react": "^6.0.1",
     "eslint": "^9.39.4",
     "eslint-plugin-react-hooks": "^7.0.1",
@@ -30,6 +31,8 @@
     "globals": "^17.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.57.0",
-    "vite": "^8.0.1"
+    "vite": "^8.0.1",
+    "vite-plugin-pwa": "^1.2.0",
+    "workbox-window": "^7.4.0"
   }
 }