introduce a way to full screen element web threads

### Your use case

#### What would you like to do?

Threads are only the right 3rd of my screen and cannot be made bigger than that

#### Why would you like to do it?

This dramatically reduces the usability of treads

#### How would you like to achieve it?

What I mean by boomer bod having trouble, scrolling up and down so much bc long messages are going off screen is difficult for my eyes.

### Have you considered any alternatives?

Not a problem on android element

### Additional context

I don't know how to use GitHub

_No response_