The target template left AppIcon.appiconset with an entry carrying no filename
— an empty slot. watchOS refuses to install an app without a valid icon, which
is why the Watch app's Install button kept coming back after ten seconds with
no error anywhere. Reuses the iOS 1024 icon, which is already alpha-free.
Both watch targets also called themselves "CalendarrWatch", which is what would
have appeared under the icon and in the complication gallery.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>