fix: Android 11 storage permission denied issue

CHANGELOG.md

@@ -13,6 +13,9 @@
 - **Search on Enter Only**: Removed auto-search debounce, now only searches when pressing Enter key (saves API calls)
 
 ### Fixed
+- **Android 11 Storage Permission**: Fixed "Permission denied" error on Android 11 (API 30) devices
+  - Added `MANAGE_EXTERNAL_STORAGE` permission for Android 11-12
+  - Shows explanation dialog before opening system settings
 - **Download Cancel**: Fixed cancelled downloads still completing in background and appearing in history. Cancelled files are now properly deleted.
 - **Search Keyboard Dismiss**: Fixed keyboard randomly dismissing and navigating back when starting to search
 - **Back Button During Search**: Back button now properly dismisses keyboard first before clearing search

android/app/src/main/AndroidManifest.xml

@@ -4,9 +4,11 @@
     <!-- Permissions -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" 
-        android:maxSdkVersion="28" />
+        android:maxSdkVersion="29" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" 
         android:maxSdkVersion="32" />
+    <!-- For Android 11+ (API 30-32) - full storage access -->
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />

lib/screens/setup_screen.dart

@@ -87,10 +87,43 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
         PermissionStatus status;
         
         if (_androidSdkVersion >= 33) {
+          // Android 13+: Use audio permission
           status = await Permission.audio.request();
         } else if (_androidSdkVersion >= 30) {
-          status = await Permission.manageExternalStorage.request();
+          // Android 11-12: Need MANAGE_EXTERNAL_STORAGE
+          // This opens system settings, not a dialog
+          status = await Permission.manageExternalStorage.status;
+          if (!status.isGranted) {
+            // Show explanation dialog first
+            if (mounted) {
+              final shouldOpen = await showDialog<bool>(
+                context: context,
+                builder: (context) => AlertDialog(
+                  title: const Text('Storage Access Required'),
+                  content: const Text(
+                    'Android 11+ requires "All files access" permission to save music files.\n\n'
+                    'Please enable "Allow access to manage all files" in the next screen.',
+                  ),
+                  actions: [
+                    TextButton(
+                      onPressed: () => Navigator.pop(context, false),
+                      child: const Text('Cancel'),
+                    ),
+                    FilledButton(
+                      onPressed: () => Navigator.pop(context, true),
+                      child: const Text('Open Settings'),
+                    ),
+                  ],
+                ),
+              );
+              
+              if (shouldOpen == true) {
+                status = await Permission.manageExternalStorage.request();
+              }
+            }
+          }
         } else {
+          // Android 10 and below: Use legacy storage permission
           status = await Permission.storage.request();
         }