fix: migrate watch app to single-target app (Xcode 27+ compat) (#92477) (opens in new tab)

fix: migrate watch app to single-target app \(Xcode 27\+ compat\) \(\#92477\) \* fix: migrate watch app to single-target app \* fix: build watch screenshots generically \* docs\(ios\): clarify watch embed invariant \* docs\(ios\): clarify watch embed invariant --------- Co-authored-by: joshavant Co-authored-by: Peter Steinberger