Updated Calendard

The calendar is now react-big-calendar.

package.json

@@ -40,6 +40,7 @@
     "bcryptjs": "^3.0.3",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "date-fns": "^4.4.0",
     "image-size": "^2.0.2",
     "jszip": "^3.10.1",
     "lucide-react": "^1.28.0",
@@ -49,6 +50,7 @@
     "next-auth": "^5.0.0-beta.32",
     "nodemailer": "^8.0.11",
     "react": "^19.2.8",
+    "react-big-calendar": "^1.20.0",
     "react-dom": "^19.2.8",
     "react-hook-form": "^7.84.0",
     "server-only": "^0.0.1",
@@ -64,6 +66,7 @@
     "@types/node": "^26.1.2",
     "@types/nodemailer": "^8.0.1",
     "@types/react": "^19.2.18",
+    "@types/react-big-calendar": "^1.16.3",
     "@types/react-dom": "^19.2.4",
     "@types/web-push": "^3.6.4",
     "dotenv": "^17.4.2",