[Feature Request]: Scale live chat and playlist with window size.

### Guidelines

- [X] I have searched the [issue tracker](https://github.com/FreeTubeApp/FreeTube/issues) for a feature request that matches the one I want to file, without success.
- [X] I have searched the [documentation](https://docs.freetubeapp.io/) for information that matches the description of the feature request I want to file, without success.

### Problem Description

The `.watchVideoSidebar` currently has a set height of 500px and playlist list and live chat also have set heights.
This doesn't look very good on screens with more pixels such as 1440p or 4k.
Even on 1080p I consider it to be a lot of wasted space.

When the setting _Hide recommended Videos_ is **enabled** there will be a lot of empty space below the sidebar area.

### Proposed Solution

Scale the height of these components with the window size.

This allows more than 4 videos would be visible at a time when scrolling through the playlist.
This is especially helpful for larger playlists.

### Alternatives Considered

Only alternative I've considered is for live chat only and would be a mode that looks similar to twitch and other streaming sites.

### Issue Labels

ease of use improvement, visual improvement

### Additional Information

live chat on 1440p screen

Playlist on 1440p screen.