Undocked playback controls disappear when scaled and inconsistencies

Issue type

UI bug

Bug description

It seems that there is no minimum width/height provided for the playback controls yet they are resizable when undocked. This means that their width and/or height can be scaled to 0 rendering them inaccessible as they are made invisible and cannot be redocked.

This is problematic as the only way to reset this is to go to View>Toolbars>Playback Controls and toggle and un-toggle the playback controls to reset them to a docked position.

Furthermore I found that while scaling the UI vertically the controls are aligned centrally yet when scaled horizontally they are justified from the left rather than centrally and the empty space around controls cannot be used to drag the playback control window around.

Steps to reproduce

1. Undock the playback controls in a score
2. Move cursor to edge of playback control window to make scale controls appear
3. Drag cursor until width and/or height is reduced to 0

Screenshots/Screen recordings

Controls disappearing

Alignment issue

MuseScore Version

MuseScore 4.0.2-230651553

Regression

I don't know

Operating system

Windows 10

Additional context

No response