[Feature Request]: Improve sidebar collapse behavior

### Guidelines

- [x] I have [searched the issue tracker for open and closed issues](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aissue+sort%3Arelevance-desc) that are similar to the feature request 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.
- [x] This issue contains only one feature request.
- [x] I have read and agree to follow the [rules](https://docs.freetubeapp.io/community/rules/).

### Problem Description

A few days ago i randomly noticed in a bunch of other applications that when a sidebar is collapsed labels get hidden by default.

In Freetube we will always show the labels in collapsed and expanded state. I would argue that our current collapsed state looks like a sort of in between state. After enabling Hide Side Bar Labels it looks more like a real collapsed state compared to other applications.

### Proposed Solution

Only show the labels in expanded state and hide them in collapsed state. This removes the need for the Hide Side Bar Labels setting

### Alternatives Considered

None

### Issue Labels

improvement to existing feature

### FreeTube Version

v0.25.3-nightly-7762 Beta

### Operating System Version

Windows 11 IoT Enterprise LTSC

### Installation Method

.exe

### Upload screenshots or videos

_No response_

### Additional Information

_No response_

The issue does not name files or tests; start by locating the sidebar component and the Hide Side Bar Labels setting in the frontend. Compare expanded and collapsed states, then verify that collapsed labels are hidden and the setting is no longer needed without breaking sidebar navigation.

Written by the indexing model from the issue text.