chore: replace dayjs with moment as date library

Moment.js provides more extensive date manipulation features compared to dayjs, which better suits our current requirements for complex date handling.

package.json

@@ -13,7 +13,7 @@
     "@reduxjs/toolkit": "^2.9.0",
     "@tailwindcss/vite": "^4.1.13",
     "axios": "^1.12.2",
-    "dayjs": "^1.11.18",
+    "moment": "^2.30.1",
     "react": "^19.1.1",
     "react-dom": "^19.1.1",
     "react-redux": "^9.2.0",