Fullscreen mode

### Your use case

#### What would you like to do?
A button to expand any caller's broadcast to the max width and height of viewport.

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

I am a low vision user and using my full monitor is crucial to feel comfortable, especially for PowerPoint and screen shares.

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

I would like the frontend styles to include a standard fullscreen icon that is standard on most media apps.

Then, the software would rely on native API to handle typical fullscreen actions. With Esc key or double tap being the "leave fullscreen" mode.

### Have you considered any alternatives?

I tried everything to expand full videos but the UI always requests itself to be present

### Additional context

_No response_