fix(offline): move Shuffle all from Home to Library only

Operator: Shuffle-all belongs in the Library view, not the Home
app bar. Moved the shuffle IconButton to LibraryScreen's app bar
(same behavior — online server-random / offline cache-union via
shuffleSourceProvider); reverted Home's app bar to the original
MainAppBarActions-only and dropped the now-unused imports.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

flutter_client/lib/library/home_screen.dart

@@ -4,9 +4,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../api/errors.dart';
-import '../cache/shuffle_source.dart';
 import '../cache/tile_providers.dart';
-import '../player/player_provider.dart';
 import '../models/playlist.dart';
 import '../models/system_playlists_status.dart';
 import '../models/track.dart';
@@ -43,28 +41,7 @@ class HomeScreen extends ConsumerWidget {
         backgroundColor: fs.obsidian,
         elevation: 0,
         title: Text('Minstrel', style: TextStyle(color: fs.parchment)),
-        actions: [
+        actions: const [MainAppBarActions(currentRoute: '/home')],
-          IconButton(
-            key: const Key('shuffle_all_button'),
-            tooltip: 'Shuffle all',
-            icon: Icon(Icons.shuffle, color: fs.parchment),
-            onPressed: () async {
-              final messenger = ScaffoldMessenger.of(context);
-              final refs =
-                  await ref.read(shuffleSourceProvider).tracks();
-              if (refs.isEmpty) {
-                messenger.showSnackBar(const SnackBar(
-                  content: Text('Nothing to shuffle yet'),
-                ));
-                return;
-              }
-              await ref
-                  .read(playerActionsProvider)
-                  .playTracks(refs, shuffle: true);
-            },
-          ),
-          const MainAppBarActions(currentRoute: '/home'),
-        ],
       ),
       body: SafeArea(
         child: index.when(

flutter_client/lib/library/library_screen.dart

@@ -15,6 +15,7 @@ import '../cache/cache_first.dart';
 import '../cache/connectivity_provider.dart';
 import '../cache/db.dart';
 import '../cache/metadata_prefetcher.dart';
+import '../cache/shuffle_source.dart';
 import '../cache/tile_providers.dart';
 import '../library/library_providers.dart' show dioProvider;
 import '../models/album.dart';
@@ -377,7 +378,27 @@ class _LibraryScreenState extends ConsumerState<LibraryScreen>
         backgroundColor: fs.obsidian,
         elevation: 0,
         title: Text('Library', style: TextStyle(color: fs.parchment)),
-        actions: const [MainAppBarActions(currentRoute: '/library')],
+        actions: [
+          IconButton(
+            key: const Key('shuffle_all_button'),
+            tooltip: 'Shuffle all',
+            icon: Icon(Icons.shuffle, color: fs.parchment),
+            onPressed: () async {
+              final messenger = ScaffoldMessenger.of(context);
+              final refs = await ref.read(shuffleSourceProvider).tracks();
+              if (refs.isEmpty) {
+                messenger.showSnackBar(const SnackBar(
+                  content: Text('Nothing to shuffle yet'),
+                ));
+                return;
+              }
+              await ref
+                  .read(playerActionsProvider)
+                  .playTracks(refs, shuffle: true);
+            },
+          ),
+          const MainAppBarActions(currentRoute: '/library'),
+        ],
         bottom: TabBar(
           controller: _ctrl,
           isScrollable: true,