fix(ui): update tutorial copy and library play button

test/design_system_test.dart

@@ -581,6 +581,42 @@ void main() {
       await tester.tap(find.byType(InkWell));
       expect(taps, 1);
     });
+
+    testWidgets('grid play action keeps a compact visual and 48dp hit box', (
+      tester,
+    ) async {
+      var taps = 0;
+      await tester.pumpWidget(
+        host(
+          Align(
+            child: TrackGridPlayButton(
+              tooltip: 'Play Song by Artist',
+              onPressed: () => taps++,
+            ),
+          ),
+        ),
+      );
+
+      final action = find.byType(TrackGridPlayButton);
+      final button = find.descendant(
+        of: action,
+        matching: find.byType(IconButton),
+      );
+      final visual = find.descendant(
+        of: action,
+        matching: find.byType(Container),
+      );
+
+      expect(tester.getSize(button), const Size.square(48));
+      expect(
+        tester.getSize(visual),
+        const Size.square(TrackGridPlayButton.visualDiameter),
+      );
+      expect(tester.getBottomRight(visual), tester.getBottomRight(button));
+
+      await tester.tap(button);
+      expect(taps, 1);
+    });
   });
 
   group('selection bar', () {

test/tutorial_copy_test.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:spotiflac_android/l10n/app_localizations.dart';
+
+void main() {
+  group('setup and tutorial copy', () {
+    test('uses the current app name and extension-based workflow', () {
+      for (final locale in AppLocalizations.supportedLocales) {
+        final strings = lookupAppLocalizations(locale);
+        final setupTagline = strings.setupDownloadInFlac.toLowerCase();
+        final firstTip = strings.tutorialWelcomeTip1.toLowerCase();
+
+        expect(
+          strings.tutorialWelcomeTitle,
+          contains('SpotiFLAC Mobile'),
+          reason: 'Unexpected app name for $locale',
+        );
+        expect(
+          setupTagline,
+          isNot(contains('spotify')),
+          reason: 'Provider-specific setup tagline for $locale',
+        );
+        expect(
+          firstTip,
+          isNot(anyOf(contains('spotify'), contains('deezer'))),
+          reason: 'Provider-specific tutorial tip for $locale',
+        );
+      }
+    });
+
+    test('English and Indonesian describe the current feature set', () {
+      final english = lookupAppLocalizations(const Locale('en'));
+      final indonesian = lookupAppLocalizations(const Locale('id'));
+
+      expect(english.tutorialWelcomeDesc, contains('extensions'));
+      expect(english.tutorialLibraryTip2, contains('built-in player'));
+      expect(indonesian.tutorialWelcomeDesc, contains('extension'));
+      expect(indonesian.tutorialLibraryTip2, contains('pemutar bawaan'));
+    });
+  });
+}