Step 3 explains what MealQuest notifies about, shows the iOS install hint
and offers "Turn on notifications" and "Maybe later". Either one PATCHes
onboarding_completed and goes Home, ending the first-run redirect.
"Turn on notifications" first calls an injectable enableNotifications(),
a no-op answering "unavailable" until Feature 19 wires Web Push; nothing
asks for notification permission.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>