feat: Add Notification Permission Explanation Sheet and deferral logic

[jotel-dev]

I've successfully completed the Notification Permission Explanation Sheet task!

Here is a summary of the completed work:

App.tsx Startup Flow: Modified App.tsx to integrate checkAndRegisterNotifications() within the deferred InteractionManager.runAfterInteractions block. The logic correctly handles tracking first launches, deferral counters in AsyncStorage, and silent token fetching if permission is already granted. The component is now cleanly injected at the end of the AuthProvider component tree.
Triggering on Engagement: We wired up src/hooks/useInAppReview.ts such that when a user triggers trackCourseComplete, the app checks hasSeenNotificationExplainer. If it's 'deferred', we present the explanation modal immediately by toggling showNotificationExplainer to true.
Unit Tests: Wrote a complete test suite for NotificationPermissionExplanationSheet.test.tsx checking correct interaction flows and mocking tricky dependencies (like NativeModules and Gorhom BottomSheet). The new unit tests successfully pass locally.
Lint and Push: Handled and fixed the remaining ESLint and formatting violations that failed the husky pre-commit hooks, ensuring clean integration.

closes #678

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[jotel-dev]

@RUKAYAT-CODER kindly review and merge

[RUKAYAT-CODER]

Thank you for contributing to the project