* Delete extra themes from the theme picker
Delete on an extra (user-installed) theme opens the shared faded confirmation dialog; confirming runs omarchy-theme-remove and selection lands on the theme before the deleted one. Stock themes and user overrides of them are not offered for deletion, apply/re-ask are blocked while a removal runs, and row refreshes queue so a deletion never leaves the list stale.
* Fail closed on theme deletion until stock themes are known
Keep Delete disabled until the stock listing finishes successfully, so a stock override cannot look deletable in the startup window. Also hold theme apply (and further delete asks) from removal exit until the refreshed rows load, so Enter cannot apply the just-deleted theme in the gap.