chore: update dependencies and enhance datetime picker styling

- Updated `multer` to version 2.1.0 and `@vitejs/plugin-react` to version 4.7.0 in package.json.
- Updated `vite` to version 6.4.1.
- Enhanced CSS for various themes to include `color-scheme` and `--picker-icon-filter` properties for better datetime picker integration.
- Refactored Calendar component to include styled datetime picker with icons for start and end time inputs.
- Improved timezone display for better user experience.

package.json

@@ -23,7 +23,7 @@
     "ioredis": "^5.10.0",
     "jsonwebtoken": "^9.0.0",
     "lucide-react": "^0.460.0",
-    "multer": "^2.0.2",
+    "multer": "^2.1.0",
     "nodemailer": "^8.0.1",
     "pg": "^8.18.0",
     "rate-limit-redis": "^4.3.1",
@@ -37,10 +37,10 @@
   "devDependencies": {
     "@types/react": "^18.3.0",
     "@types/react-dom": "^18.3.0",
-    "@vitejs/plugin-react": "^4.3.0",
+    "@vitejs/plugin-react": "^4.7.0",
     "autoprefixer": "^10.4.0",
     "postcss": "^8.4.0",
     "tailwindcss": "^3.4.0",
-    "vite": "^5.4.0"
+    "vite": "^6.4.1"
   }
 }