Rewrite Flow as a native Jetpack Compose app

[namecallfilter]

Summary

• Replace the Flutter/Dart implementation with a native Kotlin and Jetpack Compose Android app.
• Rebuild Twitch authentication, browsing, following, channel, player, navigation, settings, preferences, caching, and secure storage flows.
• Modernize the Android Gradle configuration, dependencies, manifests, themes, build tooling, and project documentation.
• Add unit and instrumentation coverage for data, authentication, navigation, UI behavior, layout parity, playback, and secure storage.

Testing

• Not run (change request content generated from the provided commit and diff).

[macroscopeapp]

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This review would cost an estimated $26.15, which exceeds your per-review limit of $10.00.

The top 3 files driving up this estimate:

File	Diff Size	Estimate
android/app/src/main/kotlin/com/namecallfilter/flow/ui/BrowseScreens.kt	54.68KB	$2.73
android/app/src/main/kotlin/com/namecallfilter/flow/ui/FlowApp.kt	51.91KB	$2.60
android/app/src/main/kotlin/com/namecallfilter/flow/ui/PlayerScreen.kt	47.02KB	$2.35

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