Real-time Notifications

**Is your feature request related to a problem? Please describe.**
Currently, the users are not getting notified if there are updates to their ticket.

**Describe the solution you'd like**
Add a notification system to inform users of updates or changes to their tickets in real-time.

**Describe alternatives you've considered**
A bell icon can be added in the navbar.

The issue names no files, tests, or entry points to inspect. Start by mapping how ticket updates are handled and how the navbar is rendered; done requires an agreed notification design that informs users of ticket changes in real time.

Written by the indexing model from the issue text.