fix(mornye): respect glass clarity and accessibility limits

test/appearance_settings_test.dart

@@ -4,6 +4,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
 import 'package:spotiflac_android/models/theme_settings.dart';
+import 'package:spotiflac_android/providers/runtime_profile_provider.dart';
 import 'package:spotiflac_android/providers/theme_provider.dart';
 import 'package:spotiflac_android/screens/settings/appearance_settings_page.dart';
 import 'package:spotiflac_android/theme/dynamic_color_wrapper.dart';
@@ -58,8 +59,9 @@ void main() {
 
   Future<void> openSettings(
     WidgetTester tester,
-    SharedPreferences prefs,
-  ) async {
+    SharedPreferences prefs, {
+    bool lowEnd = false,
+  }) async {
     tester.view.physicalSize = const Size(390, 1000);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.reset);
@@ -69,6 +71,8 @@ void main() {
           initialThemeSettingsProvider.overrideWithValue(
             loadBootstrapThemeSettings(prefs),
           ),
+          // Low-end Android without forced blur renders flat, opaque glass.
+          if (lowEnd) lowEndDeviceProvider.overrideWithValue(true),
         ],
         child: DynamicColorWrapper(
           builder: (light, dark, mode) => MaterialApp(
@@ -123,6 +127,82 @@ void main() {
       expect(tester.takeException(), isNull);
     });
 
+    testWidgets('glass clarity waits for blur on flat devices ($mode)', (
+      tester,
+    ) async {
+      SharedPreferences.setMockInitialValues({
+        kThemeStyleKey: 'mornye',
+        kThemeModeKey: mode.name,
+      });
+      final prefs = await SharedPreferences.getInstance();
+      await openSettings(tester, prefs, lowEnd: true);
+      final slider = find.byKey(const ValueKey('mornye-glass-clarity'));
+      final hint = find.byKey(
+        const ValueKey('mornye-glass-clarity-unavailable'),
+      );
+      await tester.ensureVisible(slider);
+      await tester.pumpAndSettle();
+      expect(tester.widget<Slider>(slider).onChanged, isNull);
+      expect(
+        tester.widget<Text>(hint).data,
+        'Glass is opaque on this device. Turn on '
+        '“Always use blur effects” to adjust clarity.',
+      );
+      await tester.drag(slider, const Offset(160, 0));
+      await tester.pumpAndSettle();
+      expect(tester.widget<Slider>(slider).value, kDefaultMornyeGlassClarity);
+      expect(prefs.getDouble(kMornyeGlassClarityKey), isNull);
+
+      final forceBlur = find.text('Always use blur effects');
+      await tester.scrollUntilVisible(
+        forceBlur,
+        200,
+        scrollable: find.byType(Scrollable).first,
+      );
+      await tester.tap(forceBlur);
+      await tester.pumpAndSettle();
+      // The lazily built slider scrolled away; bring it back.
+      await tester.scrollUntilVisible(
+        slider,
+        -200,
+        scrollable: find.byType(Scrollable).first,
+      );
+      await tester.pumpAndSettle();
+      expect(hint, findsNothing);
+      expect(tester.widget<Slider>(slider).onChanged, isNotNull);
+      await tester.drag(slider, const Offset(160, 0));
+      await tester.pumpAndSettle();
+      expect(prefs.getDouble(kMornyeGlassClarityKey), 1);
+      expect(tester.takeException(), isNull);
+    });
+
+    testWidgets('glass clarity explains high contrast ($mode)', (tester) async {
+      tester.platformDispatcher.accessibilityFeaturesTestValue =
+          const FakeAccessibilityFeatures(highContrast: true);
+      addTearDown(
+        tester.platformDispatcher.clearAccessibilityFeaturesTestValue,
+      );
+      SharedPreferences.setMockInitialValues({
+        kThemeStyleKey: 'mornye',
+        kThemeModeKey: mode.name,
+      });
+      final prefs = await SharedPreferences.getInstance();
+      await openSettings(tester, prefs);
+      final slider = find.byKey(const ValueKey('mornye-glass-clarity'));
+      await tester.ensureVisible(slider);
+      await tester.pumpAndSettle();
+      expect(tester.widget<Slider>(slider).onChanged, isNull);
+      expect(
+        tester
+            .widget<Text>(
+              find.byKey(const ValueKey('mornye-glass-clarity-unavailable')),
+            )
+            .data,
+        'Glass stays opaque while the system’s high contrast setting is on.',
+      );
+      expect(tester.takeException(), isNull);
+    });
+
     testWidgets('Mornye accent updates live and survives restart ($mode)', (
       tester,
     ) async {