diff --git a/analysis_options.yaml b/analysis_options.yaml
index 5da7251..2fb84c4 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -10,6 +10,7 @@
 analyzer:
   errors:
     dangling_library_doc_comments: ignore
+    deprecated_member_use: ignore
 include: package:flutter_lints/flutter.yaml
 
 linter:
diff --git a/lib/main.dart b/lib/main.dart
index 4b31c27..15ee050 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -201,7 +201,7 @@ class ZapstoreHome extends StatelessWidget {
 }
 
 final appInitializationProvider = FutureProvider<void>((ref) async {
-  final dir = await getApplicationDocumentsDirectory();
+  final dir = await getApplicationSupportDirectory();
   final dbPath = path.join(dir.path, 'zapstore.db');
 
   // Clear storage if requested from a clear all operation
diff --git a/lib/screens/profile_screen.dart b/lib/screens/profile_screen.dart
index c390959..0a04536 100644
--- a/lib/screens/profile_screen.dart
+++ b/lib/screens/profile_screen.dart
@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:convert';
 
 import 'package:async_button_builder/async_button_builder.dart';
+import 'package:auto_size_text/auto_size_text.dart';
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -1379,12 +1380,14 @@ class _DataManagementSection extends ConsumerWidget {
                   color: Theme.of(context).colorScheme.error,
                 ),
               ),
-              title: Text(
+              title: AutoSizeText(
                 'Clear local storage',
                 style: TextStyle(
                   color: Theme.of(context).colorScheme.error,
                   fontWeight: FontWeight.w600,
                 ),
+                maxLines: 1,
+                minFontSize: 12,
               ),
               contentPadding: EdgeInsets.zero,
               onTap: () => _showClearAllDataDialog(context, ref),
@@ -1403,7 +1406,7 @@ class _DataManagementSection extends ConsumerWidget {
           children: [
             Icon(Icons.warning, color: Theme.of(context).colorScheme.error),
             const SizedBox(width: 8),
-            const Text('Clear local storage'),
+            Flexible(child: const Text('Clear local storage')),
           ],
         ),
         content: const Text(
@@ -1477,80 +1480,111 @@ class _SavedAppsHeading extends ConsumerWidget {
       return const SizedBox.shrink();
     }
 
-    final savedAppsAsync = ref.watch(bookmarksProvider);
-
-    return savedAppsAsync.when(
-      loading: () => const SizedBox.shrink(),
-      error: (_, __) => const SizedBox.shrink(),
-      data: (addressableIds) {
-        if (addressableIds.isEmpty) {
-          return const SizedBox.shrink();
-        }
-
-        final identifiers = addressableIds
-            .map((id) {
-              final parts = id.split(':');
-              return parts.length >= 3 ? parts[2] : null;
-            })
-            .whereType<String>()
-            .toSet();
-
-        if (identifiers.isEmpty) {
-          return const SizedBox.shrink();
-        }
-
-        return Padding(
-          padding: const EdgeInsets.symmetric(horizontal: 16.0),
-          child: Text('Saved Apps', style: context.textTheme.headlineSmall),
-        );
-      },
+    // Always show heading when signed in
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 16.0),
+      child: Text('Saved Apps', style: context.textTheme.headlineSmall),
     );
   }
 }
 
-class _SavedAppsSection extends HookConsumerWidget {
+class _SavedAppsSection extends ConsumerWidget {
   const _SavedAppsSection();
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final signedInPubkey = ref.watch(Signer.activePubkeyProvider);
-    final hasLoadedOnce = useState(false);
-
-    if (signedInPubkey == null) {
-      return const SizedBox.shrink();
-    }
+    if (signedInPubkey == null) return const SizedBox.shrink();
 
     final savedAppsAsync = ref.watch(bookmarksProvider);
 
-    return savedAppsAsync.when(
-      loading: () => _savedAppsLoadingCard(context),
-      error: (_, __) => const SizedBox.shrink(),
-      data: (addressableIds) {
-        if (addressableIds.isEmpty) {
-          return const SizedBox.shrink();
-        }
+    // Keep previous value during refresh, if available.
+    final addressableIds = savedAppsAsync.valueOrNull;
 
-        final identifiers = addressableIds
-            .map((id) {
-              final parts = id.split(':');
-              return parts.length >= 3 ? parts[2] : null;
-            })
-            .whereType<String>()
-            .toSet();
+    // Show loading only on first load (when no value exists yet).
+    if (addressableIds == null) {
+      return _savedAppsLoadingCard(context);
+    }
 
-        if (identifiers.isEmpty) {
-          return const SizedBox.shrink();
-        }
+    final identifiers = _toIdentifiers(addressableIds);
+    return _SavedAppsList(identifiers: identifiers);
+  }
 
-        return _SavedAppsList(
-          identifiers: identifiers,
-          hasLoadedOnce: hasLoadedOnce,
-        );
-      },
+  Set<String> _toIdentifiers(Set<String> addressableIds) {
+    return addressableIds
+        .map((id) => id.split(':'))
+        .where((parts) => parts.length >= 3)
+        .map((parts) => parts[2])
+        .toSet();
+  }
+
+  Widget _savedAppsLoadingCard(BuildContext context) => Card(
+    child: Padding(
+      padding: const EdgeInsets.all(16),
+      child: Center(
+        child: CircularProgressIndicator(
+          color: Theme.of(context).colorScheme.primary,
+        ),
+      ),
+    ),
+  );
+}
+
+class _SavedAppsList extends ConsumerWidget {
+  const _SavedAppsList({required this.identifiers});
+
+  final Set<String> identifiers;
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    // No bookmarks saved - show empty state without querying
+    if (identifiers.isEmpty) {
+      return _emptyState(context);
+    }
+
+    final savedAppsState = ref.watch(
+      query<App>(
+        tags: {'#d': identifiers},
+        and: (app) => {app.latestRelease.query()},
+        source: const LocalSource(),
+        subscriptionPrefix: 'profile-saved-apps',
+      ),
+    );
+
+    final isLoading = savedAppsState is StorageLoading;
+
+    final savedApps = savedAppsState.models.toList()
+      ..sort(
+        (a, b) => (a.name ?? a.identifier).toLowerCase().compareTo(
+          (b.name ?? b.identifier).toLowerCase(),
+        ),
+      );
+
+    // Show spinner only when we truly have nothing to render yet
+    // If we're refreshing but still have models, keep showing the list
+    if (isLoading && savedApps.isEmpty) {
+      return _loadingCard(context);
+    }
+
+    if (savedApps.isEmpty) {
+      return _emptyState(context);
+    }
+
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            for (final app in savedApps)
+              AppCard(app: app, showUpdateArrow: false, showDescription: false),
+          ],
+        ),
+      ),
     );
   }
 
-  Widget _savedAppsLoadingCard(BuildContext context) {
+  Widget _loadingCard(BuildContext context) {
     return Card(
       child: Padding(
         padding: const EdgeInsets.all(16),
@@ -1562,75 +1596,15 @@ class _SavedAppsSection extends HookConsumerWidget {
       ),
     );
   }
-}
 
-class _SavedAppsList extends ConsumerWidget {
-  const _SavedAppsList({
-    required this.identifiers,
-    required this.hasLoadedOnce,
-  });
-
-  final Set<String> identifiers;
-  final ValueNotifier<bool> hasLoadedOnce;
-
-  @override
-  Widget build(BuildContext context, WidgetRef ref) {
-    final savedAppsState = ref.watch(
-      query<App>(
-        tags: {'#d': identifiers},
-        and: (app) => {app.latestRelease.query()},
-        source: const LocalSource(),
-        subscriptionPrefix: 'profile-saved-apps',
-      ),
-    );
-
-    final savedApps = savedAppsState.models.toList()
-      ..sort(
-        (a, b) => (a.name ?? a.identifier).toLowerCase().compareTo(
-          (b.name ?? b.identifier).toLowerCase(),
-        ),
-      );
-
-    // Check if we have loaded at least once - defer state update to after build
-    if (savedApps.isNotEmpty && !hasLoadedOnce.value) {
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        hasLoadedOnce.value = true;
-      });
-    }
-
-    // Show loading state only if we haven't loaded any apps yet
-    if (savedApps.isEmpty && !hasLoadedOnce.value) {
-      return Card(
-        child: Padding(
-          padding: const EdgeInsets.all(16),
-          child: Center(
-            child: CircularProgressIndicator(
-              color: Theme.of(context).colorScheme.primary,
-            ),
-          ),
-        ),
-      );
-    }
-
-    // Hide if no apps after loading
-    if (savedApps.isEmpty) {
-      return const SizedBox.shrink();
-    }
-
-    return Card(
-      child: Padding(
-        padding: const EdgeInsets.all(16),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: savedApps
-              .map(
-                (app) => AppCard(
-                  app: app,
-                  showUpdateArrow: false,
-                  showDescription: false,
-                ),
-              )
-              .toList(),
+  Widget _emptyState(BuildContext context) {
+    final theme = Theme.of(context);
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 16),
+      child: Text(
+        'No saved apps yet',
+        style: theme.textTheme.bodyMedium?.copyWith(
+          color: theme.colorScheme.onSurface.withValues(alpha: 0.5),
         ),
       ),
     );
diff --git a/lib/screens/search_screen.dart b/lib/screens/search_screen.dart
index 3592314..de21796 100644
--- a/lib/screens/search_screen.dart
+++ b/lib/screens/search_screen.dart
@@ -172,7 +172,7 @@ class _SearchResultsSection extends HookConsumerWidget {
         // Force the search to hit the default relay group (relay.zapstore.dev)
         // so a connection appears in Debug Info when searching.
         source: const RemoteSource(relays: 'AppCatalog', stream: false),
-        subscriptionPrefix: 'search-results',
+        subscriptionPrefix: 'app-search-results',
       ),
     );
 
diff --git a/lib/screens/updates_screen.dart b/lib/screens/updates_screen.dart
index 1c8e3f6..584c3cd 100644
--- a/lib/screens/updates_screen.dart
+++ b/lib/screens/updates_screen.dart
@@ -40,9 +40,9 @@ class _ConnectionStatusIndicator extends ConsumerWidget {
     final poolState = ref.watch(poolStateProvider);
     final subscriptions = poolState?.subscriptions ?? {};
 
-    // Filter to only "updates" subscription
+    // Filter to only "app-updates" subscription
     final updatesSubs = subscriptions.entries
-        .where((e) => e.key.startsWith('updates'))
+        .where((e) => e.key.startsWith('app-updates'))
         .map((e) => e.value);
 
     // Check relay status for updates subscription only
diff --git a/lib/screens/user_screen.dart b/lib/screens/user_screen.dart
index ff1d154..ebd15d8 100644
--- a/lib/screens/user_screen.dart
+++ b/lib/screens/user_screen.dart
@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:go_router/go_router.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
@@ -49,7 +50,7 @@ class UserScreen extends HookConsumerWidget {
           ),
         },
         source: const LocalAndRemoteSource(relays: 'AppCatalog', stream: false),
-        subscriptionPrefix: 'user-apps',
+        subscriptionPrefix: 'app-user-apps',
       ),
     );
 
@@ -382,34 +383,50 @@ class _NpubRow extends StatelessWidget {
     final abbreviatedNpub =
         '${npub.substring(0, 12)}...${npub.substring(npub.length - 8)}';
 
-    return GestureDetector(
-      onTap: () => launchUrl(
-        Uri.parse('https://npub.world/$npub'),
-        mode: LaunchMode.externalApplication,
-      ),
-      child: Row(
-        mainAxisSize: MainAxisSize.min,
-        children: [
-          Icon(
-            Icons.key,
-            size: 16,
-            color: Theme.of(context).colorScheme.onSurfaceVariant,
-          ),
-          const SizedBox(width: 4),
-          Text(
-            abbreviatedNpub,
-            style: Theme.of(context).textTheme.bodySmall?.copyWith(
-              color: Theme.of(context).colorScheme.onSurface,
-            ),
-          ),
-          const SizedBox(width: 4),
-          Icon(
-            Icons.open_in_new,
+    return Row(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        GestureDetector(
+          onTap: () {
+            Clipboard.setData(ClipboardData(text: npub));
+          },
+          child: Icon(
+            Icons.copy,
             size: 12,
             color: Theme.of(context).colorScheme.onSurfaceVariant,
           ),
-        ],
-      ),
+        ),
+        const SizedBox(width: 4),
+        GestureDetector(
+          onTap: () => launchUrl(
+            Uri.parse('https://npub.world/$npub'),
+            mode: LaunchMode.externalApplication,
+          ),
+          child: Row(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Icon(
+                Icons.key,
+                size: 16,
+                color: Theme.of(context).colorScheme.onSurfaceVariant,
+              ),
+              const SizedBox(width: 4),
+              Text(
+                abbreviatedNpub,
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: Theme.of(context).colorScheme.onSurface,
+                ),
+              ),
+              const SizedBox(width: 4),
+              Icon(
+                Icons.open_in_new,
+                size: 12,
+                color: Theme.of(context).colorScheme.onSurfaceVariant,
+              ),
+            ],
+          ),
+        ),
+      ],
     );
   }
 }
diff --git a/lib/services/app_restart_service.dart b/lib/services/app_restart_service.dart
index f9a5179..03ab726 100644
--- a/lib/services/app_restart_service.dart
+++ b/lib/services/app_restart_service.dart
@@ -9,7 +9,7 @@ const _markerFileName = '.clear_on_restart';
 /// Checks if storage should be cleared on this launch, and clears the marker.
 /// Call this BEFORE initializing storage.
 Future<void> maybeClearStorage(String dbPath) async {
-  final dir = await getApplicationDocumentsDirectory();
+  final dir = await getApplicationSupportDirectory();
   final marker = File('${dir.path}/$_markerFileName');
   if (await marker.exists()) {
     final dbFile = File(dbPath);
@@ -22,7 +22,7 @@ Future<void> maybeClearStorage(String dbPath) async {
 
 /// Sets a marker file and triggers a native app restart.
 Future<void> restartApp() async {
-  final dir = await getApplicationDocumentsDirectory();
+  final dir = await getApplicationSupportDirectory();
   final marker = File('${dir.path}/$_markerFileName');
   await marker.create();
   await _channel.invokeMethod('restart');
diff --git a/lib/services/background_update_service.dart b/lib/services/background_update_service.dart
index f09b9a7..4df6719 100644
--- a/lib/services/background_update_service.dart
+++ b/lib/services/background_update_service.dart
@@ -1,7 +1,9 @@
-import 'dart:io' show Directory, Platform;
+import 'dart:io' show Directory, File, Platform;
+import 'dart:ui' as ui;
 
-import 'package:background_downloader/background_downloader.dart';
+import 'package:background_downloader/background_downloader.dart' hide Request;
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:flutter/widgets.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:models/models.dart';
 import 'package:path/path.dart' as path;
@@ -9,7 +11,7 @@ import 'package:path_provider/path_provider.dart';
 import 'package:permission_handler/permission_handler.dart';
 import 'package:purplebase/purplebase.dart';
 import 'package:workmanager/workmanager.dart';
-import 'package:zapstore/services/package_manager/android_package_manager.dart';
+import 'package:zapstore/services/package_manager/background_package_manager.dart';
 import 'package:zapstore/services/package_manager/dummy_package_manager.dart';
 import 'package:zapstore/services/package_manager/package_manager.dart';
 import 'package:zapstore/utils/extensions.dart';
@@ -42,6 +44,8 @@ const kAppCatalogRelaysKey = 'appCatalogRelays';
 /// This MUST be a top-level function (not a class method).
 @pragma('vm:entry-point')
 void callbackDispatcher() {
+  WidgetsFlutterBinding.ensureInitialized();
+  ui.DartPluginRegistrant.ensureInitialized();
   Workmanager().executeTask((task, inputData) async {
     switch (task) {
       case kBackgroundUpdateTaskName:
@@ -81,11 +85,8 @@ Future<bool> _performWeeklyCleanup() async {
         try {
           // Delete the file if it exists
           final filePath = await task.filePath();
-          final file = Directory(filePath).parent.listSync().firstWhere(
-            (f) => f.path.endsWith(task.filename),
-            orElse: () => Directory(''),
-          );
-          if (file.path.isNotEmpty) {
+          final file = File(filePath);
+          if (await file.exists()) {
             await file.delete();
           }
         } catch (_) {}
@@ -105,14 +106,14 @@ Future<bool> _performWeeklyCleanup() async {
       );
 
       if (await downloadDir.exists()) {
-        final files = downloadDir.listSync();
+        final entities = downloadDir.listSync();
         final cutoff = DateTime.now().subtract(_staleDownloadThreshold);
 
-        for (final file in files) {
-          if (file is! Directory) {
-            final stat = await file.stat();
+        for (final entity in entities) {
+          if (entity is File) {
+            final stat = await entity.stat();
             if (stat.modified.isBefore(cutoff)) {
-              await file.delete();
+              await entity.delete();
             }
           }
         }
@@ -145,7 +146,7 @@ Future<bool> _checkForUpdatesInBackground(Set<String>? appCatalogRelays) async {
         storageNotifierProvider.overrideWith(PurplebaseStorageNotifier.new),
         packageManagerProvider.overrideWith(
           (ref) => Platform.isAndroid
-              ? AndroidPackageManager(ref)
+              ? BackgroundPackageManager(ref)
               : DummyPackageManager(ref),
         ),
       ],
@@ -153,7 +154,7 @@ Future<bool> _checkForUpdatesInBackground(Set<String>? appCatalogRelays) async {
 
     try {
       // Initialize Purplebase with same DB path as main app
-      final dir = await getApplicationDocumentsDirectory();
+      final dir = await getApplicationSupportDirectory();
       final dbPath = path.join(dir.path, 'zapstore.db');
 
       await container.read(
@@ -188,18 +189,40 @@ Future<bool> _checkForUpdatesInBackground(Set<String>? appCatalogRelays) async {
         source: const RemoteSource(relays: 'AppCatalog', stream: false),
       );
 
-      // Load releases for all apps in a single query
+      // Load releases and their metadata/assets (required for hasUpdate)
       if (apps.isNotEmpty) {
-        final addressableIds = apps
-            .map((app) => app.event.addressableId)
-            .toSet();
-        await storage.query(
-          RequestFilter<Release>(tags: {'#a': addressableIds}).toRequest(),
-          source: const LocalAndRemoteSource(
-            relays: 'AppCatalog',
-            stream: false,
-          ),
-        );
+        final releaseFilters = apps
+            .map((app) => app.latestRelease.req?.filters.firstOrNull)
+            .nonNulls
+            .toList();
+        if (releaseFilters.isNotEmpty) {
+          final List<Release> releases = await storage.query(
+            Request<Release>(releaseFilters),
+            source: const RemoteSource(relays: 'AppCatalog', stream: false),
+          );
+
+          final metadataFilters = releases
+              .map((r) => r.latestMetadata.req?.filters.firstOrNull)
+              .nonNulls
+              .toList();
+          if (metadataFilters.isNotEmpty) {
+            await storage.query(
+              Request<FileMetadata>(metadataFilters),
+              source: const RemoteSource(relays: 'AppCatalog', stream: false),
+            );
+          }
+
+          final assetFilters = releases
+              .map((r) => r.latestAsset.req?.filters.firstOrNull)
+              .nonNulls
+              .toList();
+          if (assetFilters.isNotEmpty) {
+            await storage.query(
+              Request<SoftwareAsset>(assetFilters),
+              source: const RemoteSource(relays: 'AppCatalog', stream: false),
+            );
+          }
+        }
       }
 
       // Re-query apps from local to ensure relationships are loaded
@@ -255,6 +278,7 @@ Future<void> _showUpdateNotification(
     android: initializationSettingsAndroid,
   );
   await flutterLocalNotificationsPlugin.initialize(initializationSettings);
+  await _ensureUpdateNotificationChannel(flutterLocalNotificationsPlugin);
 
   // Build notification content
   final title = updateCount == 1
@@ -366,23 +390,7 @@ class BackgroundUpdateService {
         // Navigation is handled by the app's normal launch flow
       },
     );
-
-    // Create notification channel on Android
-    final androidPlugin = flutterLocalNotificationsPlugin
-        .resolvePlatformSpecificImplementation<
-          AndroidFlutterLocalNotificationsPlugin
-        >();
-
-    if (androidPlugin != null) {
-      await androidPlugin.createNotificationChannel(
-        const AndroidNotificationChannel(
-          kUpdateNotificationChannelId,
-          kUpdateNotificationChannelName,
-          description: kUpdateNotificationChannelDescription,
-          importance: Importance.defaultImportance,
-        ),
-      );
-    }
+    await _ensureUpdateNotificationChannel(flutterLocalNotificationsPlugin);
   }
 
   /// Cancel background update checks
@@ -405,6 +413,26 @@ class BackgroundUpdateService {
   }
 }
 
+Future<void> _ensureUpdateNotificationChannel(
+  FlutterLocalNotificationsPlugin plugin,
+) async {
+  final androidPlugin = plugin
+      .resolvePlatformSpecificImplementation<
+        AndroidFlutterLocalNotificationsPlugin
+      >();
+
+  if (androidPlugin != null) {
+    await androidPlugin.createNotificationChannel(
+      const AndroidNotificationChannel(
+        kUpdateNotificationChannelId,
+        kUpdateNotificationChannelName,
+        description: kUpdateNotificationChannelDescription,
+        importance: Importance.defaultImportance,
+      ),
+    );
+  }
+}
+
 /// Provider for the background update service
 final backgroundUpdateServiceProvider = Provider<BackgroundUpdateService>(
   BackgroundUpdateService.new,
diff --git a/lib/services/package_manager/android_package_manager.dart b/lib/services/package_manager/android_package_manager.dart
index 0e4b350..e8c345e 100644
--- a/lib/services/package_manager/android_package_manager.dart
+++ b/lib/services/package_manager/android_package_manager.dart
@@ -4,6 +4,7 @@ import 'dart:io';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:models/models.dart';
+import 'package:zapstore/services/package_manager/installed_packages_snapshot.dart';
 import 'package:zapstore/services/package_manager/package_manager.dart';
 
 /// Install status values from native side.
@@ -600,6 +601,7 @@ final class AndroidPackageManager extends PackageManager {
       }
 
       state = state.copyWith(installed: {...packages, ...preserved});
+      await InstalledPackagesSnapshot.save(state.installed);
 
       // Clear operations for apps where the installed version matches the target version
       // This catches installs that succeeded but we missed the event
diff --git a/lib/services/package_manager/background_package_manager.dart b/lib/services/package_manager/background_package_manager.dart
new file mode 100644
index 0000000..e72e275
--- /dev/null
+++ b/lib/services/package_manager/background_package_manager.dart
@@ -0,0 +1,53 @@
+import 'package:models/models.dart';
+import 'package:zapstore/services/package_manager/installed_packages_snapshot.dart';
+import 'package:zapstore/services/package_manager/package_manager.dart';
+
+/// Background-safe PackageManager that avoids EventChannel usage.
+final class BackgroundPackageManager extends PackageManager {
+  BackgroundPackageManager(super.ref);
+
+  // Zapstore currently targets arm64 APKs for background checks.
+  @override
+  String get platform => 'android-arm64-v8a';
+
+  @override
+  String get packageExtension => '.apk';
+
+  @override
+  bool get supportsSilentInstall => false;
+
+  @override
+  Future<void> install(
+    String appId,
+    String filePath, {
+    required String expectedHash,
+    required int expectedSize,
+    required FileMetadata target,
+  }) {
+    throw UnsupportedError('Install not supported in background');
+  }
+
+  @override
+  Future<void> uninstall(String appId) {
+    throw UnsupportedError('Uninstall not supported in background');
+  }
+
+  @override
+  Future<void> launchApp(String appId) {
+    throw UnsupportedError('Launch not supported in background');
+  }
+
+  @override
+  Future<void> requestPermission() {
+    throw UnsupportedError('Permission not supported in background');
+  }
+
+  @override
+  Future<bool> hasPermission() async => false;
+
+  @override
+  Future<void> syncInstalledPackages() async {
+    final installed = await InstalledPackagesSnapshot.load();
+    state = state.copyWith(installed: installed);
+  }
+}
diff --git a/lib/services/package_manager/installed_packages_snapshot.dart b/lib/services/package_manager/installed_packages_snapshot.dart
new file mode 100644
index 0000000..043af6f
--- /dev/null
+++ b/lib/services/package_manager/installed_packages_snapshot.dart
@@ -0,0 +1,90 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
+import 'package:zapstore/services/package_manager/package_manager.dart';
+
+class InstalledPackagesSnapshot {
+  static const _fileName = 'installed_packages_snapshot.json';
+
+  static Future<File> _file() async {
+    final dir = await getApplicationSupportDirectory();
+    return File(path.join(dir.path, _fileName));
+  }
+
+  static Future<void> save(Map<String, PackageInfo> installed) async {
+    try {
+      final file = await _file();
+      final tmp = File('${file.path}.tmp');
+      final list = installed.values
+          .map(
+            (p) => <String, dynamic>{
+              'appId': p.appId,
+              'name': p.name,
+              'version': p.version,
+              'versionCode': p.versionCode,
+              'signatureHash': p.signatureHash,
+              'canInstallSilently': p.canInstallSilently,
+            },
+          )
+          .toList(growable: false);
+      final payload = jsonEncode({
+        'v': 1,
+        'savedAt': DateTime.now().millisecondsSinceEpoch,
+        'installed': list,
+      });
+      await tmp.writeAsString(payload, flush: true);
+      if (await file.exists()) {
+        await file.delete();
+      }
+      await tmp.rename(file.path);
+    } catch (e) {
+      // Best-effort snapshot only.
+      if (kDebugMode) {
+        debugPrint('[InstalledPackagesSnapshot] Save failed: $e');
+      }
+    }
+  }
+
+  static Future<Map<String, PackageInfo>> load() async {
+    try {
+      final file = await _file();
+      if (!await file.exists()) return {};
+
+      final raw = await file.readAsString();
+      final decoded = jsonDecode(raw);
+      if (decoded is! Map) return {};
+      final version = decoded['v'];
+      if (version != null && version is! int && kDebugMode) {
+        debugPrint('[InstalledPackagesSnapshot] Unknown schema: $version');
+      }
+      final installed = decoded['installed'];
+      if (installed is! List) return {};
+
+      final result = <String, PackageInfo>{};
+      for (final item in installed) {
+        if (item is! Map) continue;
+        final map = Map<String, dynamic>.from(item);
+        final appId = map['appId'] as String?;
+        if (appId == null || appId.isEmpty) continue;
+        result[appId] = PackageInfo(
+          appId: appId,
+          name: map['name'] as String?,
+          version: (map['version'] as String?) ?? '0.0.0',
+          versionCode: map['versionCode'] as int?,
+          signatureHash: (map['signatureHash'] as String?) ?? '',
+          installTime: null,
+          canInstallSilently: (map['canInstallSilently'] as bool?) ?? false,
+        );
+      }
+      return result;
+    } catch (e) {
+      if (kDebugMode) {
+        debugPrint('[InstalledPackagesSnapshot] Load failed: $e');
+      }
+      return {};
+    }
+  }
+}
diff --git a/lib/services/updates_service.dart b/lib/services/updates_service.dart
index 1a5942b..1d6ac14 100644
--- a/lib/services/updates_service.dart
+++ b/lib/services/updates_service.dart
@@ -104,7 +104,7 @@ class CategorizedAppsNotifier extends Notifier<CategorizedApps> {
           ),
         },
         source: const LocalAndRemoteSource(relays: 'AppCatalog', stream: true),
-        subscriptionPrefix: 'updates',
+        subscriptionPrefix: 'app-updates',
       ),
     );
 
diff --git a/lib/widgets/app_detail_widgets.dart b/lib/widgets/app_detail_widgets.dart
index 6025c8b..22855f1 100644
--- a/lib/widgets/app_detail_widgets.dart
+++ b/lib/widgets/app_detail_widgets.dart
@@ -735,7 +735,7 @@ class DebugVersionsSection extends HookConsumerWidget {
         tags: app.event.addressableIdTagMap,
         and: (release) => {release.latestMetadata.query(), release.latestAsset.query()},
         source: LocalAndRemoteSource(relays: 'AppCatalog', stream: false),
-        subscriptionPrefix: 'debug-releases',
+        subscriptionPrefix: 'app-debug-releases',
       ),
     );
 
diff --git a/lib/widgets/app_stack_container.dart b/lib/widgets/app_stack_container.dart
index 5b642dd..c5acd40 100644
--- a/lib/widgets/app_stack_container.dart
+++ b/lib/widgets/app_stack_container.dart
@@ -31,11 +31,7 @@ String? _extractIdentifier(String addressableId) {
 List<String> _getPreviewIdentifiers(AppStack stack) {
   final rawTags = _getRawAppTagValues(stack).toList()
     ..shuffle(Random(stack.id.hashCode));
-  return rawTags
-      .take(3)
-      .map(_extractIdentifier)
-      .whereType<String>()
-      .toList();
+  return rawTags.take(3).map(_extractIdentifier).whereType<String>().toList();
 }
 
 /// Sort app stacks: franzap/following first, then by recency
@@ -67,10 +63,12 @@ List<AppStack> _sortStacks(
     others.sort((a, b) => b.event.createdAt.compareTo(a.event.createdAt));
     return [...followed, ...others];
   } else {
-    final franzapStacks =
-        stacks.where((s) => s.pubkey == kFranzapPubkey).toList();
-    final otherStacks =
-        stacks.where((s) => s.pubkey != kFranzapPubkey).toList();
+    final franzapStacks = stacks
+        .where((s) => s.pubkey == kFranzapPubkey)
+        .toList();
+    final otherStacks = stacks
+        .where((s) => s.pubkey != kFranzapPubkey)
+        .toList();
 
     franzapStacks.shuffle(random);
     otherStacks.sort((a, b) => b.event.createdAt.compareTo(a.event.createdAt));
@@ -198,8 +196,10 @@ class AppStackContainer extends HookConsumerWidget {
             scrollController.position.maxScrollExtent - 200) {
           // Load more if we haven't shown all stacks yet
           if (visibleCount.value < sortedStacks.length) {
-            visibleCount.value = (visibleCount.value + _kBatchSize)
-                .clamp(0, sortedStacks.length);
+            visibleCount.value = (visibleCount.value + _kBatchSize).clamp(
+              0,
+              sortedStacks.length,
+            );
           }
         }
       }
@@ -231,9 +231,13 @@ class AppStackContainer extends HookConsumerWidget {
                     if (col * 2 < displayedStacks.length)
                       _StackCard(
                         stack: displayedStacks[col * 2],
-                        author: authorsMap[displayedStacks[col * 2].event.pubkey],
-                        isAuthorLoading: isAuthorLoading(displayedStacks[col * 2].event.pubkey),
-                        previewIdentifiers: stackPreviewIds[displayedStacks[col * 2].id] ?? [],
+                        author:
+                            authorsMap[displayedStacks[col * 2].event.pubkey],
+                        isAuthorLoading: isAuthorLoading(
+                          displayedStacks[col * 2].event.pubkey,
+                        ),
+                        previewIdentifiers:
+                            stackPreviewIds[displayedStacks[col * 2].id] ?? [],
                         appsMap: appsMap,
                       ),
                     // Bottom item
@@ -241,9 +245,16 @@ class AppStackContainer extends HookConsumerWidget {
                       const SizedBox(height: 10),
                       _StackCard(
                         stack: displayedStacks[col * 2 + 1],
-                        author: authorsMap[displayedStacks[col * 2 + 1].event.pubkey],
-                        isAuthorLoading: isAuthorLoading(displayedStacks[col * 2 + 1].event.pubkey),
-                        previewIdentifiers: stackPreviewIds[displayedStacks[col * 2 + 1].id] ?? [],
+                        author:
+                            authorsMap[displayedStacks[col * 2 + 1]
+                                .event
+                                .pubkey],
+                        isAuthorLoading: isAuthorLoading(
+                          displayedStacks[col * 2 + 1].event.pubkey,
+                        ),
+                        previewIdentifiers:
+                            stackPreviewIds[displayedStacks[col * 2 + 1].id] ??
+                            [],
                         appsMap: appsMap,
                       ),
                     ],
@@ -450,9 +461,7 @@ class _AppIconsRow extends StatelessWidget {
                 aspectRatio: 1,
                 child: Container(
                   decoration: BoxDecoration(
-                    color: Theme.of(context)
-                        .colorScheme
-                        .surfaceContainerHighest
+                    color: Theme.of(context).colorScheme.surfaceContainerHighest
                         .withValues(alpha: 0.8),
                     borderRadius: BorderRadius.circular(10),
                   ),
@@ -481,10 +490,9 @@ class _AppIconsRow extends StatelessWidget {
               aspectRatio: 1,
               child: Container(
                 decoration: BoxDecoration(
-                  color: Theme.of(context)
-                      .colorScheme
-                      .surfaceContainerHighest
-                      .withValues(alpha: 0.5),
+                  color: Theme.of(
+                    context,
+                  ).colorScheme.surfaceContainerHighest.withValues(alpha: 0.5),
                   borderRadius: BorderRadius.circular(10),
                 ),
               ),
@@ -520,10 +528,14 @@ class _AppIconTile extends StatelessWidget {
                     fit: BoxFit.cover,
                     fadeInDuration: const Duration(milliseconds: 200),
                     placeholder: (_, __) => Container(
-                      color: Theme.of(context).colorScheme.surfaceContainerHighest,
+                      color: Theme.of(
+                        context,
+                      ).colorScheme.surfaceContainerHighest,
                     ),
                     errorWidget: (_, __, ___) => Container(
-                      color: Theme.of(context).colorScheme.surfaceContainerHighest,
+                      color: Theme.of(
+                        context,
+                      ).colorScheme.surfaceContainerHighest,
                       child: const Icon(
                         Icons.broken_image_outlined,
                         size: 16,
@@ -532,7 +544,9 @@ class _AppIconTile extends StatelessWidget {
                     ),
                   )
                 : Container(
-                    color: Theme.of(context).colorScheme.surfaceContainerHighest,
+                    color: Theme.of(
+                      context,
+                    ).colorScheme.surfaceContainerHighest,
                     child: const Icon(
                       Icons.apps_outlined,
                       size: 16,
diff --git a/lib/widgets/latest_releases_container.dart b/lib/widgets/latest_releases_container.dart
index d9dd42c..968824f 100644
--- a/lib/widgets/latest_releases_container.dart
+++ b/lib/widgets/latest_releases_container.dart
@@ -321,7 +321,7 @@ class LatestReleasesNotifier extends StateNotifier<LatestReleasesState> {
         },
         // NOTE: It must stream=true
         source: const LocalAndRemoteSource(relays: 'AppCatalog', stream: true),
-        subscriptionPrefix: 'latest',
+        subscriptionPrefix: 'app-latest',
       ),
       (previous, next) async {
         // Always mirror storage state and ensure olderApps don't duplicate the live head
@@ -446,9 +446,9 @@ class _LatestReleasesStatusDot extends ConsumerWidget {
     final poolState = ref.watch(poolStateProvider);
     final subscriptions = poolState?.subscriptions ?? {};
 
-    // Filter to only "latest" subscription
+    // Filter to only "app-latest" subscription
     final latestSubs = subscriptions.entries
-        .where((e) => e.key.startsWith('latest'))
+        .where((e) => e.key.startsWith('app-latest'))
         .map((e) => e.value);
 
     // Check relay status for latest subscription
diff --git a/pubspec.lock b/pubspec.lock
index 607adb5..96efb8a 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -581,26 +581,26 @@ packages:
     dependency: transitive
     description:
       name: leak_tracker
-      sha256: "6bb818ecbdffe216e81182c2f0714a2e62b593f4a4f13098713ff1685dfb6ab0"
+      sha256: "33e2e26bdd85a0112ec15400c8cbffea70d0f9c3407491f672a2fad47915e2de"
       url: "https://pub.dev"
     source: hosted
-    version: "10.0.9"
+    version: "11.0.2"
   leak_tracker_flutter_testing:
     dependency: transitive
     description:
       name: leak_tracker_flutter_testing
-      sha256: f8b613e7e6a13ec79cfdc0e97638fddb3ab848452eff057653abd3edba760573
+      sha256: "1dbc140bb5a23c75ea9c4811222756104fbcd1a27173f0c34ca01e16bea473c1"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.9"
+    version: "3.0.10"
   leak_tracker_testing:
     dependency: transitive
     description:
       name: leak_tracker_testing
-      sha256: "6ba465d5d76e67ddf503e1161d1f4a6bc42306f9d66ca1e8f079a47290fb06d3"
+      sha256: "8d5a2d49f4a66b49744b23b018848400d23e54caf9463f4eb20df3eb8acb2eb1"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.1"
+    version: "3.0.2"
   lints:
     dependency: transitive
     description:
@@ -653,10 +653,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: e3641ec5d63ebf0d9b41bd43201a66e3fc79a65db5f61fc181f04cd27aab950c
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
       url: "https://pub.dev"
     source: hosted
-    version: "1.16.0"
+    version: "1.17.0"
   mime:
     dependency: transitive
     description:
@@ -1141,10 +1141,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: fb31f383e2ee25fbbfe06b40fe21e1e458d14080e3c67e7ba0acfde4df4e0bbd
+      sha256: ab2726c1a94d3176a45960b6234466ec367179b87dd74f1611adb1f3b5fb9d55
       url: "https://pub.dev"
     source: hosted
-    version: "0.7.4"
+    version: "0.7.7"
   timezone:
     dependency: transitive
     description:
@@ -1261,10 +1261,10 @@ packages:
     dependency: transitive
     description:
       name: vector_math
-      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      sha256: d530bd74fea330e6e364cda7a85019c434070188383e1cd8d9777ee586914c5b
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.4"
+    version: "2.2.0"
   vm_service:
     dependency: transitive
     description:
diff --git a/spec/guidelines/ARCHITECTURE.md b/spec/guidelines/ARCHITECTURE.md
index 5af9916..031bebe 100644
--- a/spec/guidelines/ARCHITECTURE.md
+++ b/spec/guidelines/ARCHITECTURE.md
@@ -95,4 +95,8 @@ onPressed: () async {
 }
 ```
 
+### Subscription prefix naming
+
+All queries using the `AppCatalog` relay group MUST prefix their `subscriptionPrefix` with `app-`. This is used in the backend.
+
 For detailed API, see models/purplebase READMEs in pub cache.