[Enhancement Request]: Change cursor to hand icon when hovering over tracks/clips

### Problem to be solved

The current cursor is sometimes hard to see and doesn't clearly signal that a track or clip is ready for interaction or dragging when hovering over the track header. Users currently have to click on the track to see the hand or right-click and then click Move Track Up or Move Track Down.

### Your idea

Implement a "hand" or "grab" cursor when the mouse hovers over an audio clip. This provides immediate visual feedback to the user.

### Prior art

_No response_

### Additional context

_No response_

The issue names no files, tests, or entry points. Start by locating the desktop UI code handling hover interaction for track headers and audio clips, then verify that hovering each target shows a hand or grab cursor and that the cursor remains clear for dragging.

Written by the indexing model from the issue text.