Emit Unread Notification Count Over WebSocket

[grantfox-oss]

Description:
WebSocket events broadcast new notifications but do not update users with current unread counts. Extend NotificationService and socket.server.ts to emit unread count changes on notification create/read actions.

[Meet-hybrid]

CAN I WORK ON THIS PLEASE?

[GBOYEE]

Hi! I'd like to work on this issue.

I have experience with this stack and can deliver a clean, tested solution. Please assign this to me and I'll submit a PR shortly.

My approach:

• Analyze the root cause
• Implement a fix following existing code patterns
• Add tests and documentation

Thanks!