Moving the notification-permission request into OnboardingWelcomeScreen
(#151) means the system POST_NOTIFICATIONS dialog now pops when that
screen composes. On API 33+ (where it became a runtime permission) the
dialog backgrounded the activity mid-flow, so OnboardingFlowTest failed
with "No compose hierarchies found" on API 33/34/35/36/37 while API
29–32 stayed green.
Pre-grant the permission via a GrantPermissionRule so the dialog never
appears during the flow, guarded for API 33+ (the permission does not
exist below TIRAMISU, so grant nothing there to avoid erroring on older
devices). Adds the androidx.test:rules dependency that provides the rule.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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