* Allow deleting downloaded speech models on desktop and mobile
Implement safe deletion of local speech models across desktop and
mobile platforms.
- Add a shared helper to coordinate STT service teardown, file deletion,
and voice settings cleanup.
- Prevent deleting speech models that are currently in use or starting.
- Update desktop and mobile settings UIs to expose the delete action.
* Track multiple pending model deletions and update action disabling
- Replace the single pending delete ID string state with a Set of IDs on desktop settings to track multiple concurrently deleting models.
- Switch the desktop delete action to use the standard themed Button component.
- Disable all row interactions on the mobile voice model list when any model action is busy.
- Add unit test coverage verifying that individual row delete button disabled states behave correctly.
Jinjing
Jinwoo HongandOrca