[Bug]: `Theme Settings > Expand side bar by default` causes visual issues on smaller desktop/tablet screens

### Guidelines

- [X] I have encountered this bug in the [latest release of FreeTube](https://github.com/FreeTubeApp/FreeTube/releases).
- [X] I have encountered this bug in the [official downloads of FreeTube](https://github.com/FreeTubeApp/FreeTube#official-downloads).
- [X] I have searched the issue tracker for [open](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aopen+is%3Aissue) and [closed](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aissue+is%3Aclosed) issues that are similar to the bug report I want to file, without success.
- [X] I have searched the [documentation](https://docs.freetubeapp.io/) for information that matches the description of the bug I want to file, without success.
- [X] This issue contains only one bug.

### Describe the bug

1. Enable `Settings > Theme Settings > Expand side bar by default`
2. Decrease window width to above our mobile break point (ex: 730px)
3. Notice that all content gets pushed down

https://github.com/user-attachments/assets/8441e6ae-d79d-48cc-b3c9-6ec6f3d4bee0

### Expected Behavior

Screen content should not be pushed down and should appear beside the side nav

### Issue Labels

visual bug

### FreeTube Version

0.22.0

### Operating System Version

Linux Mint 22

### Installation Method

Flathub

### Primary API used

Local API

### Last Known Working FreeTube Version (If Any)

_No response_

### Additional Information

_No response_

### Nightly Build

- [X] I have encountered this bug in the latest [nightly build](https://docs.freetubeapp.io/development/nightly-builds).