fix(downloads): retain offline media after logout

lib/providers/download_provider.dart

@@ -89,6 +89,7 @@ class DownloadProvider extends ChangeNotifier with DisposableChangeNotifierMixin
   final Map<String, SyncRuleItem> _syncRules = {};
 
   String? _activeProfileId;
+  Future<void>? _profileScopedReloadFuture;
 
   OfflineModeSource? _offlineSource;
 
@@ -141,7 +142,9 @@ class DownloadProvider extends ChangeNotifier with DisposableChangeNotifierMixin
   void setActiveProfileId(String? profileId) {
     if (_activeProfileId == profileId) return;
     _activeProfileId = profileId;
-    unawaited(_reloadProfileScopedStateForActiveProfile());
+    final reload = _reloadProfileScopedStateForActiveProfile();
+    _profileScopedReloadFuture = reload;
+    unawaited(reload);
   }
 
   Future<void> _reloadProfileScopedStateForActiveProfile() async {
@@ -219,6 +222,22 @@ class DownloadProvider extends ChangeNotifier with DisposableChangeNotifierMixin
     safeNotifyListeners();
   }
 
+  /// Preserve physical downloads across a full logout while detaching them
+  /// from profiles that are about to be deleted. The next selected profile
+  /// adopts the ownerless rows through [_loadDownloadOwners].
+  Future<void> detachDownloadsForLogout() async {
+    // Invalidate any in-flight profile reload before waiting for it: an old
+    // reload may still finish its DB adoption, but cannot repopulate the
+    // active-profile view after this point.
+    _activeProfileId = null;
+    await _initFuture;
+    await _profileScopedReloadFuture;
+    await _database.clearAllDownloadOwners();
+    _ownedDownloadKeys.clear();
+    _syncRules.clear();
+    safeNotifyListeners();
+  }
+
   /// Remove ownership rows for [profileId] that belong to the removed
   /// connection's public server ids. Physical files stay when any other valid
   /// owner remains.

lib/screens/profile/profile_teardown.dart

@@ -230,7 +230,10 @@ Future<void> logoutAllProfiles(BuildContext context) async {
 
   await companionRemote.resetForLogout();
   await userProfileProvider.logout();
-  await scope.downloads.deleteAllDownloads();
+  // Downloads are device-local data, not credentials. Keep their physical
+  // files and pinned metadata, but detach profile ownership before deleting
+  // the profiles so the next selected profile can adopt them.
+  await scope.downloads.detachDownloadsForLogout();
   scope.multiServer.clearAllConnections();
   // Drop the profile/connection rows so the next sign-in starts clean and
   // doesn't bind to stale tokens or orphaned profile rows.
@@ -246,9 +249,9 @@ Future<void> logoutAllProfiles(BuildContext context) async {
   // through the next sign-in's clients).
   await scope.database.clearAllWatchActions();
   await scope.database.clearAllSyncRules();
-  // Downloads were removed above, so no pinned cache rows need to survive this
-  // app-global logout into the next sign-in.
-  await ApiCache.instance.clearAll();
+  // Preserve pinned rows backing offline downloads; all session/API data is
+  // volatile and must not cross into the next sign-in.
+  await ApiCache.instance.clearVolatile();
   await scope.hiddenLibraries?.refresh();
   playbackState.clearShuffle();
 

test/providers/download_provider_test.dart

@@ -156,6 +156,34 @@ void main() {
 
       p.dispose();
     });
+
+    test('logout detaches ownership without deleting physical downloads', () async {
+      const globalKey = 'srv:preserved';
+      await db.insertDownload(
+        serverId: ServerId('srv'),
+        ratingKey: 'preserved',
+        globalKey: globalKey,
+        type: 'movie',
+        status: DownloadStatus.completed.index,
+      );
+      await db.addDownloadOwner(profileId: 'test-profile', globalKey: globalKey);
+
+      final p = DownloadProvider.forTesting(downloadManager: downloadManager, database: db);
+      await p.ensureInitialized();
+      p.debugSeedState(
+        downloads: {globalKey: const DownloadProgress(globalKey: globalKey, status: DownloadStatus.completed)},
+        ownedDownloadKeys: {globalKey},
+      );
+      expect(p.downloads, contains(globalKey));
+
+      await p.detachDownloadsForLogout();
+
+      expect(await db.getDownloadedMedia(globalKey), isNotNull);
+      expect(await db.hasDownloadOwner(globalKey), isFalse);
+      expect(p.downloads, isEmpty);
+
+      p.dispose();
+    });
   });
 
   group('DownloadProvider — local file selection', () {