Clicking thread preview in main timeline should toggle the threads panel

### Your use case

Currently clicking a thread preview in the main timeline only opens or switches threads.


This request suggests to toggle threads:

Thread preview in main timeline click behaviour:
- Thread panel not open → open thread panel and show thread (current behaviour)
- Thread panel open with other thread → switch to thread in thread panel (current behaviour)
- Thread panel open with same thread → close thread panel (new)

Why would I want to do that? When I see a thread, I want to take a look and then close it to get rid of the threads panel and keeps things tidy.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_