fix(android): drop unused navController from ShellScaffold

CI on 5c2011e6 caught it: removing the MiniPlayer kebab also removed
the only consumer of ShellScaffold's navController parameter, which
detekt's UnusedParameter rule flagged. Per YAGNI, dropping the param
entirely instead of @Suppress'ing a dead carry; if a future banner
or shell-level affordance needs nav, plumb it back in at that point.

Touches the public signature so all 10+ call sites in MinstrelNavGraph
also lose the `navController = navController` argument.

android/app/src/main/java/com/fabledsword/minstrel/nav/MinstrelNavGraph.kt

@@ -70,56 +70,56 @@ private fun NavGraphBuilder.inShellTopLevel(
 ) {
     composable<Home> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 HomeScreen(navController = navController)
             }
         }
     }
     composable<Library> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 LibraryScreen(navController = navController)
             }
         }
     }
     composable<Search> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 SearchScreen(navController = navController)
             }
         }
     }
     composable<Discover> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 DiscoverScreen(navController = navController)
             }
         }
     }
     composable<Playlists> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 PlaylistsListScreen(navController = navController)
             }
         }
     }
     composable<Settings> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 SettingsScreen(navController = navController)
             }
         }
     }
     composable<Admin> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 AdminLandingScreen(navController = navController)
             }
         }
     }
     composable<Requests> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 RequestsScreen(navController = navController)
             }
         }
@@ -150,42 +150,42 @@ private fun NavGraphBuilder.inShellDetail(
 ) {
     composable<AlbumDetail> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 AlbumDetailScreen(navController = navController)
             }
         }
     }
     composable<ArtistDetail> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 ArtistDetailScreen(navController = navController)
             }
         }
     }
     composable<PlaylistDetail> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 PlaylistDetailScreen(navController = navController)
             }
         }
     }
     composable<AdminRequests> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 AdminRequestsScreen(navController = navController)
             }
         }
     }
     composable<AdminQuarantine> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 AdminQuarantineScreen(navController = navController)
             }
         }
     }
     composable<AdminUsers> {
         WithAnimatedScope {
-            ShellScaffold(navController = navController, onExpandPlayer = expandPlayer) {
+            ShellScaffold(onExpandPlayer = expandPlayer) {
                 AdminUsersScreen(navController = navController)
             }
         }

android/app/src/main/java/com/fabledsword/minstrel/shared/widgets/ShellScaffold.kt

@@ -12,7 +12,6 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.hilt.navigation.compose.hiltViewModel
-import androidx.navigation.NavHostController
 import com.fabledsword.minstrel.connectivity.ui.ConnectionErrorBanner
 import com.fabledsword.minstrel.player.ui.MiniPlayer
 import com.fabledsword.minstrel.player.ui.PlaybackErrorViewModel
@@ -38,14 +37,13 @@ import com.fabledsword.minstrel.shared.widgets.trackactions.TrackActionsViewMode
  * back-only AppBar.
  *
  * [onExpandPlayer] is the navigate-to-NowPlaying callback passed
- * through to MiniPlayer's tap-handler. [navController] is kept on
- * the signature for future shell-level navigation needs (banner taps
- * etc.); MiniPlayer itself no longer carries a kebab so doesn't need
- * nav callbacks any more.
+ * through to MiniPlayer's tap-handler. No NavHostController parameter
+ * because nothing inside the shell currently navigates - if a banner
+ * (UpdateBanner / VersionTooOldBanner / ConnectionErrorBanner) ever
+ * grows tap-to-navigate, plumb a NavHostController in at that point.
  */
 @Composable
 fun ShellScaffold(
-    navController: NavHostController,
     onExpandPlayer: () -> Unit,
     modifier: Modifier = Modifier,
     trackActionsViewModel: TrackActionsViewModel = hiltViewModel(),