drag-and-drop: ensure correct drag image for panel tabs (Fixes #239048) #243853
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This pull request fixes #239048 where dragging the title of a tab in the lower panel would display incorrect text in the drag image. This issue was caused by the drag operation defaulting to the entire container, which could include unexpected text from adjacent UI elements.
Modified the drag-and-drop handler to prioritise using the .action-label element as the drag image when available, ensuring a more accurate and visually consistent drag representation. If no .action-label is found, the fallback is the entire container to maintain expected behaviour.
Added tests to verify that: