[FEATURE] Ability to hide "close" buttons on panels

### Feature Description

An option/toggle in the interface settings to allow users to hide the 'close button' on panels/windows.

### Use Case

These buttons are usually hidden in the windows by the users of WM's such as Niri or Hyprland.

### Compositor(s)

All compositors

### If Other, please specify

_No response_

### Proposed Solution

Add a toggle under Settings > Interface to globally show/hide window controls (specifically the close button).

### Alternatives/Existing Solutions

_No response_

Start in the Settings > Interface entry point and trace how panel or window controls are rendered. Add a global toggle for the close button, then verify that enabling and disabling it consistently changes the controls on all panels and windows.

Written by the indexing model from the issue text.