Fix: Prevent text selection in WindowDragBar

[Naetiksoni08]

Closes #2953

Fix: Prevent Text Selection in WindowDragBar
What does this PR do?

This PR prevents text selection in the WindowDragBar by adding user-select: none;.
It enhances the user experience by ensuring that no unwanted text highlighting occurs when dragging the window.

Changes Made:

Added user-select: none; to WindowDragBar in styles.tsx to prevent unintended text selection.
This ensures a smoother UI experience by eliminating accidental text selection in the draggable area.

Note: I couldn't run the desktop app locally due to setup issues, so I request a maintainer to verify if this fixes the problem. Let me know if any further modifications are needed.

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