# Task: Notifications System

## Objective

Implement a notification system to alert users of relevant interactions (replies, mentions, group activity).

## Steps

- [x] **Backend**:
  - [x] Create `Notification` model (user_id, type, title, message, link, is_read, created_at).
  - [x] Create `routers/notifications.py`.
  - [x] Implement `GET /notifications` (list my notifications).
  - [x] Implement `POST /notifications/{id}/read` (mark as read).
  - [x] Implement logic to trigger notifications (e.g., when a user receives a reply).
- [x] **Frontend**:
  - [x] Create `NotificationBell` component in the Navbar.
  - [x] Show unread count badge.
  - [x] Create `NotificationsPopover` or `NotificationsPage` to view list.
  - [x] Handle "Mark as Read" interaction.

## Acceptance Criteria

- User receives a notification when someone replies to their comment.
- User sees an unread count in the navbar.
- Clicking a notification navigates to the relevant content.