- Lock only when the scene really backgrounds: transient inactive
states (system photo picker, app switcher) no longer swap in the
lock screen and break gallery selection on iOS.
- Cache biometric availability once per session off the main thread
instead of calling LAContext.canEvaluatePolicy in view bodies,
which froze the macOS lock screen, and auto-prompt biometrics on
iOS only.
- Keep UI tests as an opt-in target and guard both fixes in
verify.sh.
wt