Allow dragging the docked Model Resolver dialog from its drag handle to
undock it into a floating window, with a live undock drop preview.
- Remember the dock container width and reuse it for the undock preview
- Restore the pre-dock floating size instead of falling back to defaults
- Restrict topbar drag while docked to the dedicated drag handle
- Update tests to cover the new docked drag lifecycle and preview markup
Dariusz L
643e198737