GenreViewModel: GenreUiState(genres = it) left isLoading=true (default),
so genres loaded but spinner never cleared. Added isLoading=false explicitly.
AppNavigation: replace BackHandler + navController.enableOnBackPressed with a
DisposableEffect that re-adds an OnBackPressedCallback each time NowPlaying
opens. Since callbacks are LIFO, a freshly-added callback always beats the
BackHandler NavHost registers internally, regardless of composition order.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
HoneyandClaude Sonnet 4.6
42c12cbd3a