Notification links go to wrong page or don't work (new-member lands on home)

**What happens:** Notification links are inconsistent across notification types. Some don't work at all (tapping them does nothing or stays on the current page). Others go to the wrong destination. **Specific example:** the notification "{user} joined {group}" (new member in a group) links to the **home page** instead of the group. **Expected:** every notification should deep-link to the entity it's about: - New member in a group → the group's page (or its members list) - RSVP to an event → that event's page - New event in a group I follow → that event's page - Comment / reply → the thread / event the comment is on - Connection request / new connection → the other user's profile (or chat) - Profile-related → the relevant settings page No notification should land on the home page unless the notification itself is genuinely about home-page content. **Where:** notifications list (the bell icon dropdown and the dedicated notifications page, if there's one). Affects multiple notification types — please audit each notification template's link target. **Repro (for the new-group-member case):** 1. Have an account that's a member or admin of at least one group. 2. Have another user join that group (or trigger the same notification by any other path). 3. Open your notifications list. 4. Tap the "{user} joined {group}" notification. 5. **Actual:** lands on home page. 6. **Expected:** lands on the group's page (or members list). While auditing, please also check the other notification types listed above and report any that go to the wrong place or do nothing on tap.