feat(notifications): add full notifications page with read/unread filtering

[Kaybee973]

Summary

This PR adds a dedicated notifications page that displays all user notifications with pagination, read/unread filtering, and bulk read functionality. It also introduces infinite scrolling for loading additional notifications and keeps the navigation bell count synchronized with notification state.

Motivation

The notification dropdown is limited to the five most recent notifications, making it difficult for users to review older updates. A dedicated notifications page provides a complete history, improves usability, and allows users to efficiently manage their notifications.

Changes

• Added a dedicated notifications page.
• Fetches paginated notifications from the notifications endpoint.
• Displays each notification with its message, timestamp, and read/unread status.
• Added All and Unread filter tabs.
• Implemented Mark all as read using a single API request.
• Added infinite scrolling to load additional notification pages.
• Updated the navigation notification badge to reflect unread count changes after notifications are marked as read.

Testing

• Verified all notifications are displayed with the correct message and timestamp.
• Confirmed the Unread filter displays only unread notifications.
• Verified Mark all as read updates both the notifications list and unread badge count.
• Tested infinite scrolling to ensure additional pages load correctly.
• Confirmed no regressions to the existing notification dropdown.

Acceptance Criteria

• ✅ All notifications displayed with the correct message and timestamp.
• ✅ "Mark all as read" updates all unread notifications and refreshes the UI.
• ✅ "Unread" filter shows only unread notifications.
• ✅ Infinite scrolling loads additional pages correctly.
• ✅ Navigation bell unread count stays synchronized.

Closes #43

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