feat: add lucide-react icons to QuickActions component

- Integrated lucide-react icons for QuickActions, replacing SVGs with Plus, LayoutGrid, Calendar, and Settings icons for improved UI consistency.
- Updated package.json and package-lock.json to include lucide-react dependency.
- Marked the Gravatar task as complete in TODO.md for better tracking of UI/UX improvements.

package.json

@@ -30,6 +30,7 @@
     "clsx": "^2.1.1",
     "date-fns": "^4.1.0",
     "emoji-regex": "^10.5.0",
+    "lucide-react": "^0.544.0",
     "next": "15.5.3",
     "next-auth": "^4.24.11",
     "prisma": "^6.16.1",