feat(notifications): add notification history page and API

This commit introduces the notification history feature, allowing users to view a log of their past notifications.

Key changes include:
- Added a "Notifications" link to the sidebar with a new icon.
- Defined API endpoints for fetching notification history and details.
- Added a "sent" status variant for displaying notification status.

Additionally, this commit includes related UI improvements:
- The user's full name is now dynamically displayed in the header, replacing the hardcoded placeholder.
- Table headers are now styled in uppercase for improved readability and consistency.

src/lib/api/endpoints.ts

@@ -50,4 +50,8 @@ export const API_ENDPOINTS = {
     DETAILS: (id: string) => `feedback/${id}`,
     DELETE: (id: string) => `feedback/${id}`,
   },
+  NOTIFICATIONS: {
+    HISTORY: "notifications",
+    DETAILS: (id: string) => `notifications/view/${id}`,
+  },
 } as const;