Clicking a MacOS notification should do something

### Short summary

Clicking app notifications does not take you to app or the specific thread / session the notification applies to

### Affected version or release

_No response_

### Installation context

_No response_

### What happened?


### Steps to reproduce

1. Cause a notification to trigger (e.g. a session finishes work)
2. Click the notification

RESULT: Nothing

### Expected behavior

I expect it to take me to the app and focus on the thread the notification was triggered from.

### Additional context

_No response_

No file or test is named. First reproduce the issue on macOS by triggering a session-finished notification and clicking it, then trace the notification click handling and app navigation entry point. Done means the app opens or focuses and selects the thread or session that generated the notification.

Written by the indexing model from the issue text.