fix(android): remove duplicate TrackActions snackbar wiring (DRY 3c)

ShellScaffold already collects TrackActionsViewModel.transientMessages
into its own SnackbarHost. Per-route, the shell's hiltViewModel<
TrackActionsViewModel>() and the screen's hiltViewModel<TrackActions
ViewModel>() resolve to the same NavBackStackEntry-scoped instance,
so any kebab action fires the snackbar twice today (once in the
screen's own SnackbarHost, once in the shell's).

Strip the per-screen wiring from the four shell-wrapped screens that
had it (Library, Search, AlbumDetail, PlaylistDetail): VM param,
SnackbarHostState, LaunchedEffect, and the Scaffold's snackbarHost.
The shell now owns the snackbar exclusively.

NowPlayingScreen is intentionally left untouched -- it's outside the
shell (full-screen route), so its own snackbar wiring is the only
surface that shows the message.

android/app/src/main/java/com/fabledsword/minstrel/library/ui/AlbumDetailScreen.kt

@@ -28,12 +28,9 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.SnackbarHost
-import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
@@ -62,7 +59,6 @@ import com.fabledsword.minstrel.shared.widgets.PullToRefreshScaffold
 import com.fabledsword.minstrel.shared.widgets.ServerImage
 import com.fabledsword.minstrel.shared.widgets.SkeletonTrackRow
 import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsButton
-import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsViewModel
 import com.fabledsword.minstrel.theme.FabledSwordFlatTokens
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -70,16 +66,9 @@ import com.fabledsword.minstrel.theme.FabledSwordFlatTokens
 fun AlbumDetailScreen(
     navController: NavHostController,
     viewModel: AlbumDetailViewModel = hiltViewModel(),
-    trackActionsViewModel: TrackActionsViewModel = hiltViewModel(),
     playerViewModel: com.fabledsword.minstrel.player.ui.PlayerViewModel = hiltViewModel(),
 ) {
     val state by viewModel.uiState.collectAsStateWithLifecycle()
-    val snackbarHostState = remember { SnackbarHostState() }
-    LaunchedEffect(Unit) {
-        trackActionsViewModel.transientMessages.collect { msg ->
-            snackbarHostState.showSnackbar(msg)
-        }
-    }
     Scaffold(
         modifier = Modifier.fillMaxSize(),
         topBar = {
@@ -92,7 +81,6 @@ fun AlbumDetailScreen(
                 },
             )
         },
-        snackbarHost = { SnackbarHost(snackbarHostState) },
     ) { inner ->
         PullToRefreshScaffold(
             onRefresh = { viewModel.refresh().join() },

android/app/src/main/java/com/fabledsword/minstrel/library/ui/LibraryScreen.kt

@@ -18,12 +18,9 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.PrimaryScrollableTabRow
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.SnackbarHost
-import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Tab
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.remember
@@ -52,7 +49,6 @@ import com.fabledsword.minstrel.shared.widgets.MinstrelTopAppBar
 import com.fabledsword.minstrel.shared.widgets.PullToRefreshScaffold
 import com.fabledsword.minstrel.shared.widgets.SkeletonAlbumTile
 import com.fabledsword.minstrel.shared.widgets.SkeletonArtistTile
-import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsViewModel
 
 /**
  * Library tab. Five-tab TabBar (Artists / Albums / History / Liked /
@@ -72,16 +68,9 @@ import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsViewMode
 fun LibraryScreen(
     navController: NavHostController,
     viewModel: LibraryViewModel = hiltViewModel(),
-    trackActionsViewModel: TrackActionsViewModel = hiltViewModel(),
 ) {
     var selectedTab by remember { mutableIntStateOf(0) }
     val tabs = LIBRARY_TABS
-    val snackbarHostState = remember { SnackbarHostState() }
-    LaunchedEffect(Unit) {
-        trackActionsViewModel.transientMessages.collect { msg ->
-            snackbarHostState.showSnackbar(msg)
-        }
-    }
 
     Scaffold(
         modifier = Modifier.fillMaxSize(),
@@ -115,7 +104,6 @@ fun LibraryScreen(
                 }
             }
         },
-        snackbarHost = { SnackbarHost(snackbarHostState) },
     ) { inner ->
         Box(modifier = Modifier.fillMaxSize().padding(inner)) {
             when (selectedTab) {

android/app/src/main/java/com/fabledsword/minstrel/playlists/ui/PlaylistDetailScreen.kt

@@ -28,8 +28,6 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.SnackbarHost
-import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
@@ -78,7 +76,6 @@ import com.fabledsword.minstrel.shared.widgets.PullToRefreshScaffold
 import com.fabledsword.minstrel.shared.widgets.SkeletonTrackRow
 import com.fabledsword.minstrel.shared.widgets.TrackCoverThumb
 import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsButton
-import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsViewModel
 import com.fabledsword.minstrel.theme.FabledSwordFlatTokens
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Job
@@ -241,16 +238,9 @@ class PlaylistDetailViewModel @Inject constructor(
 fun PlaylistDetailScreen(
     navController: NavHostController,
     viewModel: PlaylistDetailViewModel = hiltViewModel(),
-    trackActionsViewModel: TrackActionsViewModel = hiltViewModel(),
     playerViewModel: com.fabledsword.minstrel.player.ui.PlayerViewModel = hiltViewModel(),
 ) {
     val state by viewModel.uiState.collectAsState()
-    val snackbarHostState = remember { SnackbarHostState() }
-    LaunchedEffect(Unit) {
-        trackActionsViewModel.transientMessages.collect { msg ->
-            snackbarHostState.showSnackbar(msg)
-        }
-    }
     LaunchedEffect(Unit) {
         viewModel.deleted.collect { navController.popBackStack() }
     }
@@ -276,7 +266,6 @@ fun PlaylistDetailScreen(
                 },
             )
         },
-        snackbarHost = { SnackbarHost(snackbarHostState) },
     ) { inner ->
         PullToRefreshScaffold(
             onRefresh = { viewModel.refresh().join() },

android/app/src/main/java/com/fabledsword/minstrel/search/ui/SearchScreen.kt

@@ -25,8 +25,6 @@ import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.SnackbarHost
-import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextField
 import androidx.compose.material3.TextFieldDefaults
@@ -62,27 +60,19 @@ import com.fabledsword.minstrel.shared.widgets.LoadingCentered
 import com.fabledsword.minstrel.shared.widgets.MainAppBarActions
 import com.fabledsword.minstrel.shared.widgets.TrackCoverThumb
 import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsButton
-import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsViewModel
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun SearchScreen(
     navController: NavHostController,
     viewModel: SearchViewModel = hiltViewModel(),
-    trackActionsViewModel: TrackActionsViewModel = hiltViewModel(),
     playerViewModel: com.fabledsword.minstrel.player.ui.PlayerViewModel = hiltViewModel(),
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
     val playerState by playerViewModel.uiState.collectAsStateWithLifecycle()
     val playingTrackId = playerState.currentTrack?.id
     val focusRequester = remember { FocusRequester() }
-    val snackbarHostState = remember { SnackbarHostState() }
     LaunchedEffect(Unit) { focusRequester.requestFocus() }
-    LaunchedEffect(Unit) {
-        trackActionsViewModel.transientMessages.collect { msg ->
-            snackbarHostState.showSnackbar(msg)
-        }
-    }
 
     Scaffold(
         modifier = Modifier.fillMaxSize(),
@@ -113,7 +103,6 @@ fun SearchScreen(
                 },
             )
         },
-        snackbarHost = { SnackbarHost(snackbarHostState) },
     ) { inner ->
         Box(modifier = Modifier.fillMaxSize().padding(inner)) {
             ResultsPane(