[Bug] Unable to move the window by dragging the title bar on Linux

[ZhBF]

Describe the bug
On Linux, clicking and dragging the title bar (or the top panel area) does not move the application window. The window remains fixed in its initial position.

To Reproduce
Steps to reproduce the behavior:

1. Open the application on a Linux system.
2. Move the mouse cursor to the title bar / header area.
3. Click and hold the left mouse button to grab the window.
4. Attempt to drag the cursor to a new position.
5. Issue: The window does not follow the cursor and stays stuck in place.

Expected behavior
The window should be draggable and follow the mouse cursor when the title bar is clicked and dragged, consistent with standard OS window behavior.

Desktop (please complete the following information):

• OS: Debian 13 (trixie) x86_64
• Desktop Environment: KDE Plasma
• Windowing System: X11

[StudentWeis]

Can you fix this like Windows before?

[ZhBF]

feature/linux-window-dragging

This technically resolves the issue, but the implementation is quite inelegant and honestly,
I'm reluctant to merge it as-is. While manual mouse tracking works, it feels more like a
workaround than a proper solution. I think you can explore alternative approaches before merging.