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/android/app/src/main/kotlin/dev/zapstore/alpha/plugins/AndroidPackageManagerPlugin.kt b/android/app/src/main/kotlin/dev/zapstore/alpha/plugins/AndroidPackageManagerPlugin.kt
index 8196927..986cb66 100644
--- a/android/app/src/main/kotlin/dev/zapstore/alpha/plugins/AndroidPackageManagerPlugin.kt
+++ b/android/app/src/main/kotlin/dev/zapstore/alpha/plugins/AndroidPackageManagerPlugin.kt
@@ -25,6 +25,9 @@ import io.flutter.plugin.common.MethodChannel.Result
 import java.io.File
 import java.io.FileInputStream
 import java.security.MessageDigest
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
 
 private const val TAG = "AndroidPackageManager"
 
@@ -37,6 +40,9 @@ private const val VERIFY_WATCHDOG_MS = 10_000L
 private const val INSTALL_WATCHDOG_MS = 10_000L
 private const val MAX_INSTALL_WATCHDOG_MS = 120_000L
 
+/** Buffer size for file operations - 64KB for optimal throughput on large APKs */
+private const val COPY_BUFFER_SIZE = 65536
+
 /**
  * Install status values emitted via EventChannel.
  * These form a simple state machine with no hanging states.
@@ -45,6 +51,7 @@ object InstallStatus {
     const val STARTED = "started"
     const val VERIFYING = "verifying"
     const val PENDING_USER_ACTION = "pendingUserAction"
+    const val INSTALLING = "installing"  // User accepted, system is now installing
     const val ALREADY_IN_PROGRESS = "alreadyInProgress"
     const val SUCCESS = "success"
     const val FAILED = "failed"
@@ -93,7 +100,16 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
     private val watchdogDeadlineMs = mutableMapOf<String, Long>()
 
     /** Track verification threads so we can "ping" and avoid false timeouts */
-    private val verificationThreads = mutableMapOf<String, Thread>()
+    private val verificationThreads = ConcurrentHashMap<String, Thread>()
+
+    /** Track sessions that are pending user action (so we can detect when user accepts) */
+    private val sessionsPendingUserAction = mutableSetOf<Int>()
+
+    /** Track sessions that have emitted INSTALLING status (to avoid duplicates) */
+    private val sessionsInstalling = mutableSetOf<Int>()
+
+    /** Session callback to detect progress after user confirms install */
+    private var sessionCallback: PackageInstaller.SessionCallback? = null
     
     private var eventSink: EventChannel.EventSink? = null
     
@@ -101,7 +117,7 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
         private var instance: AndroidPackageManagerPlugin? = null
         
         /** Map sessionId to packageName for reverse lookup in broadcasts */
-        private val sessionToPackage = mutableMapOf<Int, String>()
+        private val sessionToPackage = ConcurrentHashMap<Int, String>()
         
         /** Pending user action intents - stored for re-launch when app returns to foreground */
         private val pendingUserActionIntents = mutableMapOf<String, Intent>()
@@ -135,6 +151,9 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
             if (status == InstallStatus.PENDING_USER_ACTION && confirmIntent != null) {
                 pendingUserActionIntents[pkg] = confirmIntent
                 
+                // Track this session as pending user action so SessionCallback can detect acceptance
+                instance?.sessionsPendingUserAction?.add(sessionId)
+                
                 // Auto-launch dialog if app is in foreground
                 if (isAppInForeground) {
                     launchConfirmDialog(pkg, confirmIntent)
@@ -145,6 +164,8 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
             if (status in listOf(InstallStatus.SUCCESS, InstallStatus.FAILED, InstallStatus.CANCELLED)) {
                 sessionToPackage.remove(sessionId)
                 pendingUserActionIntents.remove(pkg)
+                instance?.sessionsPendingUserAction?.remove(sessionId)
+                instance?.sessionsInstalling?.remove(sessionId)
                 
                 if (status != InstallStatus.SUCCESS) {
                     abandonSession(sessionId)
@@ -177,12 +198,27 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
         
         private fun launchConfirmDialog(packageName: String, intent: Intent) {
             val ctx = appContext ?: return
-            try {
-                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_SINGLE_TOP)
-                ctx.startActivity(intent)
-                Log.d(TAG, "Launched confirmation dialog for $packageName")
-            } catch (e: Exception) {
-                Log.w(TAG, "Failed to launch confirmation dialog for $packageName", e)
+            val inst = instance
+            
+            // Post with delay to ensure the system is ready to show the dialog.
+            // Without this, the dialog may not appear when the broadcast arrives
+            // immediately after session.commit() while the app is still processing.
+            val launcher: () -> Unit = {
+                try {
+                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_SINGLE_TOP)
+                    ctx.startActivity(intent)
+                    Log.d(TAG, "Launched confirmation dialog for $packageName")
+                } catch (e: Exception) {
+                    Log.w(TAG, "Failed to launch confirmation dialog for $packageName", e)
+                }
+                Unit
+            }
+            
+            if (inst != null) {
+                inst.mainHandler.postDelayed(launcher, 100)
+            } else {
+                // Fallback if instance not available
+                Handler(Looper.getMainLooper()).postDelayed(launcher, 100)
             }
         }
         
@@ -218,6 +254,9 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
             ProcessLifecycleOwner.get().lifecycle.addObserver(this)
         }
         
+        // Register session callback to detect when user accepts install dialog
+        registerSessionCallback()
+        
         cleanupStaleSessions()
         Log.d(TAG, "AndroidPackageManagerPlugin initialized")
     }
@@ -226,6 +265,7 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
         mainHandler.post {
             ProcessLifecycleOwner.get().lifecycle.removeObserver(this)
         }
+        unregisterSessionCallback()
         methodChannel.setMethodCallHandler(null)
         eventChannel.setStreamHandler(null)
         eventSink = null
@@ -257,6 +297,57 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
         Log.d(TAG, "App backgrounded")
     }
     
+    // ═══════════════════════════════════════════════════════════════════════════════
+    // SESSION CALLBACK (Detect when user accepts install dialog)
+    // ═══════════════════════════════════════════════════════════════════════════════
+    
+    private fun registerSessionCallback() {
+        sessionCallback = object : PackageInstaller.SessionCallback() {
+            override fun onCreated(sessionId: Int) {}
+            override fun onBadgingChanged(sessionId: Int) {}
+            override fun onActiveChanged(sessionId: Int, active: Boolean) {}
+            
+            override fun onProgressChanged(sessionId: Int, progress: Float) {
+                // When we see progress on a session that was pending user action,
+                // it means the user accepted and the system is now installing.
+                val pkg = sessionToPackage[sessionId] ?: return
+                
+                // Only emit INSTALLING once per session
+                if (sessionId in sessionsPendingUserAction && sessionId !in sessionsInstalling) {
+                    sessionsInstalling.add(sessionId)
+                    sessionsPendingUserAction.remove(sessionId)
+                    Log.d(TAG, "User accepted install for $pkg (progress=$progress)")
+                    onInstallResult(
+                        sessionId = sessionId,
+                        status = InstallStatus.INSTALLING,
+                        packageName = pkg,
+                        message = "Installing..."
+                    )
+                }
+            }
+            
+            override fun onFinished(sessionId: Int, success: Boolean) {
+                // Clean up tracking
+                sessionsPendingUserAction.remove(sessionId)
+                sessionsInstalling.remove(sessionId)
+            }
+        }
+        
+        context.packageManager.packageInstaller.registerSessionCallback(sessionCallback!!, mainHandler)
+        Log.d(TAG, "Registered session callback")
+    }
+    
+    private fun unregisterSessionCallback() {
+        sessionCallback?.let {
+            try {
+                context.packageManager.packageInstaller.unregisterSessionCallback(it)
+            } catch (e: Exception) {
+                Log.w(TAG, "Failed to unregister session callback", e)
+            }
+        }
+        sessionCallback = null
+    }
+    
     // ═══════════════════════════════════════════════════════════════════════════════
     // EVENT CHANNEL STREAM HANDLER
     // ═══════════════════════════════════════════════════════════════════════════════
@@ -389,7 +480,7 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
                 // Start watchdog for verify stage
                 scheduleWatchdog(appId, VERIFY_WATCHDOG_MS)
             }
-            InstallStatus.STARTED, InstallStatus.PENDING_USER_ACTION -> {
+            InstallStatus.STARTED, InstallStatus.PENDING_USER_ACTION, InstallStatus.INSTALLING -> {
                 // Start/refresh watchdog for install stage
                 scheduleWatchdog(appId, INSTALL_WATCHDOG_MS)
             }
@@ -486,83 +577,95 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
             abandonExistingSession(packageName)
         }
         
-        if (expectedHash != null && expectedSize != null) {
-            // Emit verifying status before starting hash check
-            emitInstallStatus(packageName, InstallStatus.VERIFYING)
-            result.success(mapOf("started" to true, "verifying" to true))
-            
-            val t = Thread {
-                val verification = verifyApk(file, expectedHash, expectedSize)
-                mainHandler.post {
-                    if (verification.isSuccess) {
-                        startInstallSession(file, packageName, result = null) // Result already sent
-                    } else {
-                        emitInstallStatus(
-                            packageName, 
-                            InstallStatus.FAILED, 
-                            verification.errorTitle,
-                            verification.errorCode,
-                            verification.errorDescription
-                        )
-                    }
-                    verificationThreads.remove(packageName)
-                }
-            }
-            verificationThreads[packageName] = t
-            t.start()
-        } else {
-            startInstallSession(file, packageName, result)
+        // Check for install restrictions on main thread before starting background work
+        val userManager = context.getSystemService(UserManager::class.java)
+        val installBlocked = userManager.hasUserRestriction(UserManager.DISALLOW_INSTALL_APPS) ||
+            userManager.hasUserRestriction(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES) ||
+            userManager.hasUserRestriction(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY)
+        
+        if (installBlocked) {
+            emitInstallStatus(packageName, InstallStatus.FAILED, "Installation blocked by device policy", ErrorCode.BLOCKED)
+            result.success(mapOf("started" to false, "error" to "Blocked by policy", "errorCode" to ErrorCode.BLOCKED))
+            return
         }
+        
+        // Emit verifying status - all install work happens on background thread
+        emitInstallStatus(packageName, InstallStatus.VERIFYING)
+        result.success(mapOf("started" to true, "verifying" to true))
+        
+        // All heavy I/O work runs on background thread to prevent ANRs
+        val t = Thread {
+            verifyAndInstall(file, packageName, expectedHash, expectedSize)
+            verificationThreads.remove(packageName)
+        }
+        verificationThreads[packageName] = t
+        t.start()
     }
     
-    private fun startInstallSession(apkFile: File, packageName: String, result: Result?) {
+    /**
+     * Single-pass verify and install - runs entirely on background thread.
+     * 
+     * This method:
+     * 1. Validates APK format (ZIP magic bytes)
+     * 2. Creates install session
+     * 3. Streams file ONCE - computing hash AND copying to session simultaneously
+     * 4. Reports progress during copy
+     * 5. Commits session on success, cleans up on failure
+     * 
+     * Benefits:
+     * - 50% less I/O (file read once instead of twice)
+     * - No ANRs (runs off main thread)
+     * - Better UX with progress reporting
+     * - Proper resource cleanup on all error paths
+     */
+    private fun verifyAndInstall(
+        apkFile: File,
+        packageName: String,
+        expectedHash: String?,
+        expectedSize: Long?
+    ) {
+        // Step 1: Validate APK format before doing any heavy work
+        if (!isValidApkFormat(apkFile)) {
+            apkFile.delete()
+            mainHandler.post {
+                emitInstallStatus(
+                    packageName,
+                    InstallStatus.FAILED,
+                    "Invalid APK file",
+                    ErrorCode.INVALID_FILE,
+                    "The downloaded file is not a valid APK format."
+                )
+            }
+            return
+        }
+        
+        val packageInstaller = context.packageManager.packageInstaller
+        var sessionId = -1
+        var session: PackageInstaller.Session? = null
+        
         try {
-            val userManager = context.getSystemService(UserManager::class.java)
-            val installBlocked = userManager.hasUserRestriction(UserManager.DISALLOW_INSTALL_APPS) ||
-                userManager.hasUserRestriction(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES) ||
-                userManager.hasUserRestriction(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY)
-            
-            if (installBlocked) {
-                emitInstallStatus(packageName, InstallStatus.FAILED, "Installation blocked by device policy", ErrorCode.BLOCKED)
-                result?.success(mapOf("started" to false, "error" to "Blocked by policy", "errorCode" to ErrorCode.BLOCKED))
-                return
-            }
-            
-            val packageInstaller = context.packageManager.packageInstaller
-            val pkgInfo = context.packageManager.getPackageArchiveInfo(apkFile.absolutePath, 0)
-            if (pkgInfo == null) {
-                emitInstallStatus(packageName, InstallStatus.FAILED, "Invalid APK file", ErrorCode.INVALID_FILE)
-                result?.success(mapOf("started" to false, "error" to "Invalid APK", "errorCode" to ErrorCode.INVALID_FILE))
-                return
-            }
-            
-            // CRITICAL: Use the passed packageName for tracking, not the APK's internal package name
-            // This ensures Dart's operation key matches the events we emit
-            // The APK's packageName should match, but we log a warning if not
-            val trackingPackageName = packageName
-            if (pkgInfo.packageName != packageName) {
-                Log.w(TAG, "Package name mismatch: tracking='$packageName', APK contains='${pkgInfo.packageName}'. Using tracking name for events.")
-            }
-            
+            // Step 2: Check if this is an update
             val isUpdate = try {
-                context.packageManager.getPackageInfo(pkgInfo.packageName, 0)
+                context.packageManager.getPackageInfo(packageName, 0)
                 true
             } catch (_: PackageManager.NameNotFoundException) { false }
             
-            abandonExistingSession(trackingPackageName)
+            // Step 3: Abandon any existing session and create new one
+            abandonExistingSession(packageName)
             
             val sessionParams = PackageInstaller.SessionParams(
                 PackageInstaller.SessionParams.MODE_FULL_INSTALL
             ).apply {
-                // Set app package name for proper installer tracking
-                setAppPackageName(pkgInfo.packageName)
+                // Use the passed packageName directly - no getPackageArchiveInfo() needed
+                // Android validates the APK during commit anyway
+                setAppPackageName(packageName)
                 
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
                     setRequireUserAction(PackageInstaller.SessionParams.USER_ACTION_NOT_REQUIRED)
-                    // Explicitly set ourselves as the installer for update ownership
                     setInstallerPackageName(context.packageName)
                 }
-                setInstallLocation(pkgInfo.installLocation)
+                // Use AUTO install location - safe default without parsing APK
+                setInstallLocation(android.content.pm.PackageInfo.INSTALL_LOCATION_AUTO)
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                     setPackageSource(PackageInstaller.PACKAGE_SOURCE_STORE)
                 }
@@ -571,24 +674,82 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
                 }
             }
             
-            val sessionId = packageInstaller.createSession(sessionParams)
-            val session = packageInstaller.openSession(sessionId)
-            // Use tracking name so events match Dart's operation key
-            sessionToPackage[sessionId] = trackingPackageName
+            sessionId = packageInstaller.createSession(sessionParams)
+            session = packageInstaller.openSession(sessionId)
+            sessionToPackage[sessionId] = packageName
+            
+            // Step 4: Single-pass verify + copy with progress reporting
+            val digest = if (expectedHash != null) MessageDigest.getInstance("SHA-256") else null
             
             FileInputStream(apkFile).use { fis ->
                 val fileSize = Os.fstat(fis.fd).st_size
-                val sessionStream = session.openWrite(apkFile.name, 0, fileSize)
-                fis.copyTo(sessionStream)
-                fis.close()
-                session.fsync(sessionStream)
-                sessionStream.close()
+                
+                session.openWrite(apkFile.name, 0, fileSize).use { sessionStream ->
+                    val buffer = ByteArray(COPY_BUFFER_SIZE)
+                    var bytesCopied = 0L
+                    var lastProgressPercent = -1
+                    var bytesRead: Int
+                    
+                    while (fis.read(buffer).also { bytesRead = it } != -1) {
+                        // Hash the chunk if verification is needed
+                        digest?.update(buffer, 0, bytesRead)
+                        
+                        // Copy to session
+                        sessionStream.write(buffer, 0, bytesRead)
+                        bytesCopied += bytesRead
+                        
+                        // Report progress (throttled to whole percentage changes)
+                        if (fileSize > 0) {
+                            val progressPercent = ((bytesCopied * 100) / fileSize).toInt()
+                            if (progressPercent != lastProgressPercent && progressPercent % 5 == 0) {
+                                lastProgressPercent = progressPercent
+                                Log.d(TAG, "Copy progress for $packageName: $progressPercent%")
+                            }
+                        }
+                    }
+                    
+                    session.fsync(sessionStream)
+                }
             }
             
+            // Step 5: Verify hash if expected
+            if (digest != null && expectedHash != null) {
+                val actualHash = digest.digest().joinToString("") { "%02x".format(it) }
+                if (!actualHash.equals(expectedHash, ignoreCase = true)) {
+                    // Hash mismatch - clean up and fail
+                    session.close()
+                    packageInstaller.abandonSession(sessionId)
+                    sessionToPackage.remove(sessionId)
+                    
+                    mainHandler.post {
+                        emitInstallStatus(
+                            packageName,
+                            InstallStatus.FAILED,
+                            "Hash verification failed",
+                            ErrorCode.HASH_MISMATCH,
+                            "The downloaded file hash does not match.\n\nExpected: $expectedHash\nActual: $actualHash"
+                        )
+                    }
+                    return
+                }
+            }
+            
+            // Step 6: Emit STARTED *before* commit to avoid race with SUCCESS broadcast
+            // For silent installs, the SUCCESS broadcast can arrive immediately after commit.
+            // We use a CountDownLatch to ensure STARTED is processed on main thread before
+            // we call commit(), which could trigger an immediate broadcast.
+            val startedLatch = CountDownLatch(1)
+            mainHandler.post {
+                emitInstallStatus(packageName, InstallStatus.STARTED)
+                startedLatch.countDown()
+            }
+            // Wait for STARTED to be emitted (timeout prevents deadlock if main thread is blocked)
+            startedLatch.await(1, TimeUnit.SECONDS)
+            
+            // Step 7: Commit the session - this triggers the install broadcast
             val intent = Intent(context.applicationContext, InstallResultReceiver::class.java).apply {
                 putExtra("sessionId", sessionId)
-                // Use tracking name so events match Dart's operation key
-                putExtra("packageName", trackingPackageName)
+                putExtra("packageName", packageName)
                 putExtra("isUpdate", isUpdate)
             }
             val pendingIntent = PendingIntent.getBroadcast(
@@ -598,16 +759,40 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
             
             session.commit(pendingIntent.intentSender)
             session.close()
-            
-            emitInstallStatus(trackingPackageName, InstallStatus.STARTED)
-            result?.success(mapOf("started" to true, "sessionId" to sessionId, "packageName" to trackingPackageName))
+            session = null  // Prevent double-close in finally
             
         } catch (e: SecurityException) {
-            emitInstallStatus(packageName, InstallStatus.FAILED, "Permission denied: ${e.message}", ErrorCode.PERMISSION_DENIED)
-            result?.success(mapOf("started" to false, "error" to "Permission denied", "errorCode" to ErrorCode.PERMISSION_DENIED))
+            // Clean up session on error
+            session?.close()
+            if (sessionId >= 0) {
+                try { packageInstaller.abandonSession(sessionId) } catch (_: Exception) {}
+                sessionToPackage.remove(sessionId)
+            }
+            
+            mainHandler.post {
+                emitInstallStatus(
+                    packageName,
+                    InstallStatus.FAILED,
+                    "Permission denied: ${e.message}",
+                    ErrorCode.PERMISSION_DENIED
+                )
+            }
         } catch (e: Exception) {
-            emitInstallStatus(packageName, InstallStatus.FAILED, e.message ?: "Installation failed", ErrorCode.INSTALL_FAILED)
-            result?.success(mapOf("started" to false, "error" to e.message, "errorCode" to ErrorCode.INSTALL_FAILED))
+            // Clean up session on error
+            session?.close()
+            if (sessionId >= 0) {
+                try { packageInstaller.abandonSession(sessionId) } catch (_: Exception) {}
+                sessionToPackage.remove(sessionId)
+            }
+            
+            mainHandler.post {
+                emitInstallStatus(
+                    packageName,
+                    InstallStatus.FAILED,
+                    e.message ?: "Installation failed",
+                    ErrorCode.INSTALL_FAILED
+                )
+            }
         }
     }
     
@@ -648,48 +833,13 @@ class AndroidPackageManagerPlugin : FlutterPlugin, MethodCallHandler,
     }
     
     // ═══════════════════════════════════════════════════════════════════════════════
-    // APK VERIFICATION
+    // APK VALIDATION
     // ═══════════════════════════════════════════════════════════════════════════════
     
-    private data class VerificationResult(
-        val isSuccess: Boolean, 
-        val errorTitle: String = "",
-        val errorDescription: String? = null,
-        val errorCode: String? = null
-    )
-    
-    private fun verifyApk(file: File, expectedHash: String, expectedSize: Long): VerificationResult {
-        if (!isValidApkFormat(file)) {
-            file.delete()
-            return VerificationResult(
-                false, 
-                "Invalid APK file",
-                "The downloaded file is not a valid APK format.",
-                ErrorCode.INVALID_FILE
-            )
-        }
-        
-        val digest = MessageDigest.getInstance("SHA-256")
-        FileInputStream(file).use { fis ->
-            val buffer = ByteArray(8192)
-            var bytesRead: Int
-            while (fis.read(buffer).also { bytesRead = it } != -1) {
-                digest.update(buffer, 0, bytesRead)
-            }
-        }
-        val actualHash = digest.digest().joinToString("") { "%02x".format(it) }
-        
-        if (actualHash.lowercase() != expectedHash.lowercase()) {
-            return VerificationResult(
-                false, 
-                "Hash verification failed",
-                "The downloaded file hash does not match.\n\nExpected: $expectedHash\nActual: $actualHash",
-                ErrorCode.HASH_MISMATCH
-            )
-        }
-        return VerificationResult(true)
-    }
-    
+    /**
+     * Quick APK format check - validates ZIP magic bytes.
+     * This is a lightweight check that doesn't load the APK into memory.
+     */
     private fun isValidApkFormat(file: File): Boolean {
         return try {
             FileInputStream(file).use { fis ->
diff --git a/lib/main.dart b/lib/main.dart
index 4b31c27..cf0cf6c 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -12,6 +12,7 @@ import 'package:purplebase/purplebase.dart';
 import 'package:amber_signer/amber_signer.dart';
 import 'package:zapstore/services/app_restart_service.dart';
 import 'package:zapstore/services/background_update_service.dart';
+import 'package:zapstore/services/secure_storage_service.dart';
 import 'package:zapstore/router.dart';
 import 'package:zapstore/services/package_manager/package_manager.dart';
 import 'package:zapstore/theme.dart';
@@ -201,7 +202,7 @@ 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
@@ -218,7 +219,8 @@ final appInitializationProvider = FutureProvider<void>((ref) async {
         ),
         defaultRelays: {
           'default': {'wss://relay.zapstore.dev'},
-          'bootstrap': {'wss://purplepag.es', 'wss://relay.zapstore.dev'},
+          'bootstrap': {'wss://relay.zapstore.dev'},
+          // TODO: add 'wss://purplepag.es' back when it's fixed
           'AppCatalog': {'wss://relay.zapstore.dev'},
           'social': {
             'wss://relay.damus.io',
@@ -245,7 +247,10 @@ final appInitializationProvider = FutureProvider<void>((ref) async {
 });
 
 // AmberSigner provider for Nostr authentication
-final amberSignerProvider = Provider<AmberSigner>(AmberSigner.new);
+// Uses SecureStoragePubkeyPersistence to survive database clears
+final amberSignerProvider = Provider<AmberSigner>(
+  (ref) => AmberSigner(ref, persistence: SecureStoragePubkeyPersistence()),
+);
 
 Future<void> _attemptAutoSignIn(Ref ref) async {
   try {
diff --git a/lib/router.dart b/lib/router.dart
index dcf9be8..8099d5a 100644
--- a/lib/router.dart
+++ b/lib/router.dart
@@ -9,6 +9,7 @@ import 'package:zapstore/screens/user_screen.dart';
 import 'package:zapstore/screens/search_screen.dart';
 import 'package:zapstore/screens/updates_screen.dart';
 import 'package:zapstore/screens/profile_screen.dart';
+import 'package:zapstore/services/package_manager/package_manager.dart';
 
 /// Root paths for each navigation branch (used for back navigation handling)
 const kBranchRoots = ['/search', '/updates', '/profile'];
@@ -128,4 +129,25 @@ final routerProvider = Provider<GoRouter>((ref) {
       ),
     ],
   );
+
+  // Listen for route changes to trigger actions
+  void onRouteChange() {
+    final currentPath = router.routerDelegate.currentConfiguration.uri.path;
+    final isUpdatesRoute = currentPath.startsWith('/updates');
+    final wasUpdatesRoute = previousPath?.startsWith('/updates') ?? false;
+
+    // Sync installed packages when navigating TO the updates branch
+    if (isUpdatesRoute && !wasUpdatesRoute) {
+      unawaited(
+        ref.read(packageManagerProvider.notifier).syncInstalledPackages(),
+      );
+    }
+
+    previousPath = currentPath;
+  }
+
+  router.routerDelegate.addListener(onRouteChange);
+  ref.onDispose(() => router.routerDelegate.removeListener(onRouteChange));
+
+  return router;
 });
diff --git a/lib/screens/profile_screen.dart b/lib/screens/profile_screen.dart
index c390959..f9bf4b7 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';
@@ -22,9 +23,7 @@ import 'package:zapstore/theme.dart';
 import 'package:zapstore/services/notification_service.dart';
 import 'package:zapstore/widgets/common/note_parser.dart';
 import 'package:zapstore/widgets/nwc_widgets.dart';
-
-// Note: Relay debugging features have been removed as they depend on internal APIs
-// that are no longer public in purplebase 0.3.3+
+import 'package:zapstore/widgets/relay_management_card.dart';
 
 /// Profile screen for authentication and app settings
 class ProfileScreen extends ConsumerWidget {
@@ -63,6 +62,11 @@ class ProfileScreen extends ConsumerWidget {
 
           const SizedBox(height: 16),
 
+          // App Catalog Relay Management Section
+          const RelayManagementCard(),
+
+          const SizedBox(height: 16),
+
           // Data Management Section
           const _DataManagementSection(),
 
@@ -1379,12 +1383,14 @@ 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),
@@ -1403,12 +1409,12 @@ 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(
-          'Clears all cached data (except NWC secret) and restarts the app. '
-          'You will be signed out.',
+          'Clears all cached data and restarts the app. '
+          'Your sign-in and wallet connection will be preserved.',
         ),
         actions: [
           TextButton(
@@ -1477,80 +1483,111 @@ 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 +1599,15 @@ 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 f82f2a6..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
@@ -61,7 +61,7 @@ class _ConnectionStatusIndicator extends ConsumerWidget {
 
     final statusColor = hasActiveConnection ? Colors.green : Colors.grey;
     final statusText = hasActiveConnection
-        ? 'Connected · Checking for updates'
+        ? 'Connected · Streaming updates'
         : 'Offline';
 
     return Container(
@@ -147,16 +147,7 @@ class _UpdatesContent extends HookConsumerWidget {
         .map((entry) => entry.key)
         .toSet();
 
-    if (activeAppIds.isEmpty) {
-      return _UpdatesListBody(
-        automaticUpdates: automaticUpdates,
-        manualUpdates: manualUpdates,
-        installingApps: const [],
-        upToDateApps: upToDateApps,
-        uncatalogedApps: uncatalogedApps,
-      );
-    }
-
+    // Always use the same widget type to preserve scroll position
     return _UpdatesListBodyWithInstallingAppIds(
       installingAppIds: activeAppIds,
       automaticUpdates: automaticUpdates,
@@ -184,27 +175,32 @@ class _UpdatesListBodyWithInstallingAppIds extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final installingAppsState = ref.watch(
-      query<App>(
-        tags: {'#d': installingAppIds},
-        and: (app) => {app.latestRelease.query()},
-        source: const LocalAndRemoteSource(relays: 'AppCatalog'),
-        subscriptionPrefix: 'installing-apps',
-      ),
-    );
-
     final updateAppIds = {
       ...automaticUpdates.map((a) => a.identifier),
       ...manualUpdates.map((a) => a.identifier),
     };
 
-    final installingApps = installingAppsState.models
-        .where(
-          (app) =>
-              installingAppIds.contains(app.identifier) &&
-              !updateAppIds.contains(app.identifier),
-        )
-        .toList();
+    // Only query for installing apps if there are active operations
+    final List<App> installingApps;
+    if (installingAppIds.isEmpty) {
+      installingApps = const [];
+    } else {
+      final installingAppsState = ref.watch(
+        query<App>(
+          tags: {'#d': installingAppIds},
+          and: (app) => {app.latestRelease.query()},
+          source: const LocalAndRemoteSource(relays: 'AppCatalog'),
+          subscriptionPrefix: 'installing-apps',
+        ),
+      );
+      installingApps = installingAppsState.models
+          .where(
+            (app) =>
+                installingAppIds.contains(app.identifier) &&
+                !updateAppIds.contains(app.identifier),
+          )
+          .toList();
+    }
 
     return _UpdatesListBody(
       automaticUpdates: automaticUpdates,
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 17315f3..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.
@@ -14,6 +15,7 @@ enum InstallStatus {
   started,
   verifying,
   pendingUserAction,
+  installing, // User accepted, system is now installing
   alreadyInProgress,
   success,
   failed,
@@ -26,6 +28,7 @@ extension InstallStatusX on InstallStatus {
       'started' => InstallStatus.started,
       'verifying' => InstallStatus.verifying,
       'pendingUserAction' => InstallStatus.pendingUserAction,
+      'installing' => InstallStatus.installing,
       'alreadyInProgress' => InstallStatus.alreadyInProgress,
       'success' => InstallStatus.success,
       'failed' => InstallStatus.failed,
@@ -170,6 +173,17 @@ final class AndroidPackageManager extends PackageManager {
         }
         break;
 
+      case InstallStatus.installing:
+        // User accepted the install dialog, system is now installing.
+        // Transition to Installing with isSilent=true to show "Installing..."
+        if (filePath != null) {
+          setOperation(
+            appId,
+            Installing(target: target, filePath: filePath, isSilent: true),
+          );
+        }
+        break;
+
       case InstallStatus.alreadyInProgress:
         // Real pending dialog exists - Kotlin will also send pendingUserAction event
         // which transitions to Installing. Nothing to do here.
@@ -587,6 +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/package_manager/package_manager.dart b/lib/services/package_manager/package_manager.dart
index 171737a..9b32f8f 100644
--- a/lib/services/package_manager/package_manager.dart
+++ b/lib/services/package_manager/package_manager.dart
@@ -731,25 +731,46 @@ abstract class PackageManager extends StateNotifier<PackageManagerState> {
   }
 
   void _processQueuedDownload() {
-    var activeDownloads = countOperations<Downloading>();
+    final activeDownloads = countOperations<Downloading>();
     if (activeDownloads >= maxConcurrentDownloads) return;
 
-    // Start downloads until we fill all available slots
+    // Collect queued items first to avoid iterating while modifying state
+    final queuedItems = <String, DownloadQueued>{};
     for (final entry in state.operations.entries) {
-      if (activeDownloads >= maxConcurrentDownloads) break;
-
       if (entry.value is DownloadQueued) {
-        final queued = entry.value as DownloadQueued;
-        final downloadUrl = queued.target.urls.firstOrNull;
-        if (downloadUrl != null) {
+        queuedItems[entry.key] = entry.value as DownloadQueued;
+      }
+    }
+
+    if (queuedItems.isEmpty) return;
+
+    // Start downloads until we fill all available slots
+    var started = 0;
+    for (final entry in queuedItems.entries) {
+      if (activeDownloads + started >= maxConcurrentDownloads) break;
+
+      final queued = entry.value;
+      final downloadUrl = queued.target.urls.firstOrNull;
+      if (downloadUrl != null) {
+        unawaited(
           _startDownloadTask(
             entry.key,
             queued.target,
             downloadUrl,
             displayName: queued.displayName,
-          );
-          activeDownloads++;
-        }
+          ),
+        );
+        started++;
+      } else {
+        // No URL - fail the operation so it doesn't stay queued forever
+        setOperation(
+          entry.key,
+          OperationFailed(
+            target: queued.target,
+            type: FailureType.downloadFailed,
+            message: 'No download URL available',
+          ),
+        );
       }
     }
   }
diff --git a/lib/services/secure_storage_service.dart b/lib/services/secure_storage_service.dart
index 7af1ae1..25e5496 100644
--- a/lib/services/secure_storage_service.dart
+++ b/lib/services/secure_storage_service.dart
@@ -1,3 +1,4 @@
+import 'package:amber_signer/amber_signer.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 
@@ -34,8 +35,27 @@ class SecureStorageService {
     final value = await _storage.read(key: _nwcKey);
     return value?.isNotEmpty == true;
   }
+}
 
-  /// Check if the install permission dialog has been shown
+/// Persists the AmberSigner pubkey in flutter_secure_storage.
+/// This survives app data clears (database deletion) and is encrypted.
+class SecureStoragePubkeyPersistence implements AmberPubkeyPersistence {
+  static const _key = 'amber_pubkey';
+
+  @override
+  Future<void> persistPubkey(String pubkey) async {
+    await SecureStorageService._storage.write(key: _key, value: pubkey);
+  }
+
+  @override
+  Future<String?> loadPubkey() async {
+    return SecureStorageService._storage.read(key: _key);
+  }
+
+  @override
+  Future<void> clearPubkey() async {
+    await SecureStorageService._storage.delete(key: _key);
+  }
 }
 
 final secureStorageServiceProvider = Provider<SecureStorageService>(
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/install_button.dart b/lib/widgets/install_button.dart
index b3782b6..bf17b02 100644
--- a/lib/widgets/install_button.dart
+++ b/lib/widgets/install_button.dart
@@ -106,7 +106,7 @@ class InstallButton extends ConsumerWidget {
       return switch (operation) {
         DownloadQueued() => _buildSimpleButton(
           context,
-          'Queued',
+          'Queued for download',
           null,
           fontSize: fontSize,
           showSpinner: true,
@@ -146,12 +146,12 @@ class InstallButton extends ConsumerWidget {
           isWarning: true,
         ),
 
-        ReadyToInstall() => _buildAsyncButton(
+        ReadyToInstall() => _buildSimpleButton(
           context,
-          ref,
-          text: isInstalled ? 'Update' : 'Install',
-          onPressed: () => _triggerInstall(ref),
+          'Queued for ${isInstalled ? 'update' : 'install'}',
+          null, // Not tappable - system advances automatically
           fontSize: fontSize,
+          showSpinner: true,
         ),
 
         Installing(:final isSilent) => _buildSimpleButton(
@@ -539,11 +539,6 @@ class InstallButton extends ConsumerWidget {
     pm.resumeDownload(app.identifier);
   }
 
-  Future<void> _triggerInstall(WidgetRef ref) async {
-    final pm = ref.read(packageManagerProvider.notifier);
-    await pm.triggerInstall(app.identifier);
-  }
-
   Future<void> _retryInstall(WidgetRef ref) async {
     final pm = ref.read(packageManagerProvider.notifier);
     await pm.retryInstall(app.identifier);
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/lib/widgets/relay_management_card.dart b/lib/widgets/relay_management_card.dart
new file mode 100644
index 0000000..d2c1d0d
--- /dev/null
+++ b/lib/widgets/relay_management_card.dart
@@ -0,0 +1,592 @@
+import 'package:collection/collection.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_hooks/flutter_hooks.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:models/models.dart';
+import 'package:purplebase/purplebase.dart';
+import 'package:zapstore/services/app_restart_service.dart';
+import 'package:zapstore/services/notification_service.dart';
+import 'package:zapstore/theme.dart';
+import 'package:zapstore/utils/extensions.dart';
+
+/// Provider for the user's app catalog relay list.
+final _appCatalogRelayListProvider =
+    Provider<StorageState<AppCatalogRelayList>?>((ref) {
+  final pubkey = ref.watch(Signer.activePubkeyProvider);
+
+  if (pubkey == null) {
+    return null;
+  }
+
+  return ref.watch(
+    query<AppCatalogRelayList>(
+      authors: {pubkey},
+      limit: 1,
+      source: const LocalAndRemoteSource(
+        relays: 'bootstrap',
+        stream: false,
+      ),
+      subscriptionPrefix: 'user-appcatalog-relays',
+    ),
+  );
+});
+
+/// App Catalog Relay Management Card - manages app catalog relays (kind 10067)
+/// These are relays for discovering apps, NOT social relays like Damus/Primal.
+///
+/// Changes are accumulated in memory and applied with "Apply Changes" which
+/// publishes the relay list and restarts the app with a fresh database.
+class RelayManagementCard extends HookConsumerWidget {
+  const RelayManagementCard({super.key});
+
+  static const _kDefaultRelay = 'wss://relay.zapstore.dev';
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final signedInPubkey = ref.watch(Signer.activePubkeyProvider);
+
+    // Only show when user is signed in
+    if (signedInPubkey == null) {
+      return const SizedBox.shrink();
+    }
+
+    final relayUrlController = useTextEditingController();
+    final hasText = useState(false);
+    final isApplying = useState(false);
+
+    // Watch pool state for relay connection status
+    final poolState = ref.watch(poolStateProvider);
+
+    // Watch remote relay list
+    final relayListState = ref.watch(_appCatalogRelayListProvider);
+    final existingRelayList = relayListState?.models.firstOrNull;
+    final savedRelays = (existingRelayList?.readRelays ?? <String>{}).toList()
+      ..sort();
+
+    // If no relays saved, show default relay
+    final effectiveSavedRelays =
+        savedRelays.isEmpty ? [_kDefaultRelay] : savedRelays;
+
+    // Local pending state - initialized from effective saved relays
+    final pendingRelays = useState<List<String>?>(null);
+
+    // Initialize pending from effective saved when first loaded
+    useEffect(() {
+      if (pendingRelays.value == null && relayListState is StorageData) {
+        pendingRelays.value = effectiveSavedRelays;
+      }
+      return null;
+    }, [relayListState]);
+
+    // Current display relays (pending if modified, else effective saved)
+    final displayRelays = pendingRelays.value ?? effectiveSavedRelays;
+    final hasChanges =
+        pendingRelays.value != null &&
+        !const ListEquality<String>().equals(
+          pendingRelays.value,
+          effectiveSavedRelays,
+        );
+
+    // Listen to text changes to enable/disable add button
+    useEffect(() {
+      void listener() {
+        hasText.value = relayUrlController.text.trim().isNotEmpty;
+      }
+
+      relayUrlController.addListener(listener);
+      return () => relayUrlController.removeListener(listener);
+    }, [relayUrlController]);
+
+    void addRelay(String relayUrl) {
+      // Validate and normalize URL
+      final normalizedUrl = _validateAndNormalizeRelayUrl(relayUrl);
+      if (normalizedUrl == null) {
+        context.showError(
+          'Invalid relay URL',
+          description: 'Must be a valid WebSocket URL (ws:// or wss://)',
+        );
+        return;
+      }
+
+      // Check for duplicates
+      final currentRelays = pendingRelays.value ?? savedRelays;
+      if (_isDuplicateRelay(normalizedUrl, currentRelays.toSet())) {
+        context.showError(
+          'Relay already exists',
+          description: 'This relay is already in your list.',
+        );
+        return;
+      }
+
+      pendingRelays.value = [...currentRelays, normalizedUrl]..sort();
+      relayUrlController.clear();
+    }
+
+    void removeRelay(String relayUrl) {
+      final currentRelays = pendingRelays.value ?? savedRelays;
+      final newRelays = currentRelays.where((r) => r != relayUrl).toList();
+      // App catalog relays can never be empty - show error if trying to remove last
+      if (newRelays.isEmpty) {
+        context.showError(
+          'Cannot remove last relay',
+          description: 'App catalog relays cannot be empty. '
+              'Add another relay before removing this one.',
+        );
+        return;
+      }
+      pendingRelays.value = newRelays;
+    }
+
+    Future<void> applyChanges() async {
+      final confirmed = await showDialog<bool>(
+        context: context,
+        builder: (context) => AlertDialog(
+          title: Row(
+            children: [
+              Icon(Icons.dns, color: Theme.of(context).colorScheme.primary),
+              const SizedBox(width: 8),
+              const Text('Apply Relay Changes'),
+            ],
+          ),
+          content: const Text(
+            'Changing app catalog relays will clear cached app data and restart the app. '
+            'Your sign-in and wallet connection will be preserved.',
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(context, false),
+              child: const Text('Cancel'),
+            ),
+            FilledButton(
+              onPressed: () => Navigator.pop(context, true),
+              child: const Text('Apply Changes'),
+            ),
+          ],
+        ),
+      );
+
+      if (confirmed != true || !context.mounted) return;
+
+      isApplying.value = true;
+      var loadingDialogShown = false;
+
+      try {
+        final signer = ref.read(Signer.activeSignerProvider);
+        if (signer == null) {
+          isApplying.value = false;
+          if (context.mounted) {
+            context.showError('Sign in required');
+          }
+          return;
+        }
+
+        // Create and sign the relay list (use displayRelays which reflects user's intent)
+        final partialRelayList = PartialAppCatalogRelayList();
+        for (final relay in displayRelays) {
+          partialRelayList.addReadRelay(relay);
+        }
+        final signedRelayList = await partialRelayList.signWith(signer);
+
+        // Publish to bootstrap relays
+        await ref.storage.publish({
+          signedRelayList,
+        }, source: const RemoteSource(relays: 'bootstrap'));
+
+        // Show loading dialog
+        if (context.mounted) {
+          loadingDialogShown = true;
+          showDialog(
+            context: context,
+            barrierDismissible: false,
+            builder: (dialogContext) => const AlertDialog(
+              content: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  CircularProgressIndicator(
+                    color: AppColors.darkSkeletonHighlight,
+                    backgroundColor: AppColors.darkSkeletonBase,
+                  ),
+                  SizedBox(height: 16),
+                  Text('Restarting...'),
+                ],
+              ),
+            ),
+          );
+        }
+
+        // Restart app with database clear
+        await restartApp();
+      } catch (e) {
+        isApplying.value = false;
+        if (context.mounted) {
+          if (loadingDialogShown) {
+            Navigator.of(context, rootNavigator: true).pop();
+          }
+          context.showError(
+            'Failed to apply relay changes',
+            description: '$e',
+            actions: [('Retry', () => applyChanges())],
+          );
+        }
+      }
+    }
+
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            // Header
+            Row(
+              children: [
+                Icon(Icons.dns, color: Theme.of(context).colorScheme.primary),
+                const SizedBox(width: 8),
+                Expanded(
+                  child: Text(
+                    'App Catalog Relays',
+                    style: Theme.of(context).textTheme.titleMedium,
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 8),
+
+            // Info text
+            Container(
+              padding: const EdgeInsets.all(12),
+              decoration: BoxDecoration(
+                color: Theme.of(context).colorScheme.surfaceContainerHighest,
+                borderRadius: BorderRadius.circular(8),
+              ),
+              child: Row(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Padding(
+                    padding: const EdgeInsets.only(top: 2),
+                    child: Icon(
+                      Icons.info_outline,
+                      size: 16,
+                      color: Theme.of(context).colorScheme.primary,
+                    ),
+                  ),
+                  const SizedBox(width: 10),
+                  Expanded(
+                    child: Text(
+                      'These relays are used to discover apps, not for social content.',
+                      style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                        color: Theme.of(
+                          context,
+                        ).colorScheme.onSurface.withValues(alpha: 0.7),
+                      ),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            const SizedBox(height: 16),
+
+            // Current relays list
+            if (displayRelays.isEmpty)
+              Padding(
+                padding: const EdgeInsets.only(bottom: 8),
+                child: Text(
+                  'Using default catalog relays. Add a relay to override.',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: Theme.of(
+                      context,
+                    ).colorScheme.onSurface.withValues(alpha: 0.55),
+                  ),
+                ),
+              )
+            else
+              ConstrainedBox(
+                constraints: const BoxConstraints(maxHeight: 200),
+                child: ListView.separated(
+                  shrinkWrap: true,
+                  physics: displayRelays.length > 4
+                      ? const BouncingScrollPhysics()
+                      : const NeverScrollableScrollPhysics(),
+                  itemCount: displayRelays.length,
+                  separatorBuilder: (_, __) => const SizedBox(height: 6),
+                  itemBuilder: (context, index) {
+                    final relayUrl = displayRelays[index];
+
+                    // Get relay connection status from pool state
+                    final statusColor =
+                        _getRelayStatusColor(poolState, relayUrl);
+
+                    return Container(
+                      width: double.infinity,
+                      padding: const EdgeInsets.symmetric(
+                        horizontal: 12,
+                        vertical: 8,
+                      ),
+                      decoration: BoxDecoration(
+                        color: Theme.of(context)
+                            .colorScheme
+                            .surfaceContainerHighest
+                            .withValues(alpha: 0.3),
+                        borderRadius: BorderRadius.circular(8),
+                        border: Border.all(
+                          color: Theme.of(
+                            context,
+                          ).colorScheme.outline.withValues(alpha: 0.2),
+                        ),
+                      ),
+                      child: Row(
+                        crossAxisAlignment: CrossAxisAlignment.center,
+                        children: [
+                          // Status dot
+                          Container(
+                            width: 10,
+                            height: 10,
+                            margin: const EdgeInsets.only(left: 4, right: 4),
+                            decoration: BoxDecoration(
+                              shape: BoxShape.circle,
+                              color: statusColor,
+                              boxShadow: statusColor != Colors.grey
+                                  ? [
+                                      BoxShadow(
+                                        color:
+                                            statusColor.withValues(alpha: 0.4),
+                                        blurRadius: 4,
+                                        spreadRadius: 1,
+                                      ),
+                                    ]
+                                  : null,
+                            ),
+                          ),
+                          const SizedBox(width: 8),
+                          Expanded(
+                            child: Text(
+                              relayUrl,
+                              style: const TextStyle(
+                                fontSize: 13,
+                                fontFamily: 'monospace',
+                                fontWeight: FontWeight.w500,
+                              ),
+                            ),
+                          ),
+                          SizedBox(
+                            width: 24,
+                            height: 24,
+                            child: IconButton(
+                              icon: Icon(
+                                Icons.close,
+                                size: 18,
+                                color: Theme.of(context).colorScheme.error,
+                              ),
+                              padding: EdgeInsets.zero,
+                              constraints: const BoxConstraints.tightFor(
+                                width: 24,
+                                height: 24,
+                              ),
+                              onPressed: isApplying.value
+                                  ? null
+                                  : () => removeRelay(relayUrl),
+                              tooltip: 'Remove relay',
+                            ),
+                          ),
+                        ],
+                      ),
+                    );
+                  },
+                ),
+              ),
+
+            const SizedBox(height: 8),
+
+            // Add relay input
+            Row(
+              children: [
+                Expanded(
+                  child: TextField(
+                    controller: relayUrlController,
+                    enabled: !isApplying.value,
+                    decoration: InputDecoration(
+                      hintText: 'wss://relay.example.com',
+                      hintStyle: TextStyle(
+                        fontSize: 12,
+                        color: Theme.of(
+                          context,
+                        ).colorScheme.onSurface.withValues(alpha: 0.4),
+                      ),
+                      contentPadding: const EdgeInsets.symmetric(
+                        horizontal: 12,
+                        vertical: 10,
+                      ),
+                      border: OutlineInputBorder(
+                        borderRadius: BorderRadius.circular(8),
+                      ),
+                      isDense: true,
+                    ),
+                    style: const TextStyle(
+                      fontSize: 13,
+                      fontFamily: 'monospace',
+                    ),
+                    onSubmitted: isApplying.value
+                        ? null
+                        : (value) {
+                            if (value.trim().isNotEmpty) {
+                              addRelay(value.trim());
+                            }
+                          },
+                  ),
+                ),
+                const SizedBox(width: 8),
+                IconButton(
+                  onPressed: isApplying.value || !hasText.value
+                      ? null
+                      : () {
+                          final url = relayUrlController.text.trim();
+                          if (url.isNotEmpty) {
+                            addRelay(url);
+                          }
+                        },
+                  icon: const Icon(Icons.add),
+                  tooltip: 'Add relay',
+                  style: IconButton.styleFrom(
+                    backgroundColor: isApplying.value || !hasText.value
+                        ? Theme.of(context)
+                            .colorScheme
+                            .surfaceContainerHighest
+                            .withValues(alpha: 0.3)
+                        : Theme.of(context).colorScheme.primaryContainer,
+                    foregroundColor: isApplying.value || !hasText.value
+                        ? Theme.of(
+                            context,
+                          ).colorScheme.onSurface.withValues(alpha: 0.4)
+                        : Theme.of(context).colorScheme.onPrimaryContainer,
+                  ),
+                ),
+              ],
+            ),
+
+            // Apply Changes button (only shown when there are changes)
+            if (hasChanges) ...[
+              const SizedBox(height: 16),
+              SizedBox(
+                width: double.infinity,
+                child: FilledButton.icon(
+                  onPressed: isApplying.value ? null : applyChanges,
+                  icon: isApplying.value
+                      ? const SizedBox(
+                          width: 16,
+                          height: 16,
+                          child: CircularProgressIndicator(
+                            strokeWidth: 2,
+                            color: Colors.white,
+                          ),
+                        )
+                      : const Icon(Icons.refresh),
+                  label: Text(
+                    isApplying.value ? 'Applying...' : 'Apply Changes',
+                  ),
+                ),
+              ),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+
+  /// Validates and normalizes a relay URL.
+  /// Uses wss:// unless ws:// is explicitly specified.
+  /// If no protocol is provided, wss:// is assumed.
+  /// Normalizes default ports (443 for wss, 80 for ws) by omitting them.
+  static String? _validateAndNormalizeRelayUrl(String input) {
+    var url = input.trim();
+
+    // Add wss:// if no protocol specified
+    if (!url.startsWith('ws://') && !url.startsWith('wss://')) {
+      url = 'wss://$url';
+    }
+
+    final uri = Uri.tryParse(url);
+    if (uri == null || uri.host.isEmpty) return null;
+
+    // Use wss:// unless ws:// is explicitly specified
+    final scheme = uri.scheme == 'ws' ? 'ws' : 'wss';
+    final path = uri.path.endsWith('/')
+        ? uri.path.substring(0, uri.path.length - 1)
+        : uri.path;
+
+    // Normalize default ports: omit 443 for wss and 80 for ws
+    final isDefaultPort = (scheme == 'wss' && uri.port == 443) ||
+        (scheme == 'ws' && uri.port == 80);
+    final normalizedPort =
+        uri.hasPort && !isDefaultPort ? uri.port : null;
+
+    return Uri(
+      scheme: scheme,
+      host: uri.host.toLowerCase(),
+      port: normalizedPort,
+      path: path.isEmpty ? null : path,
+    ).toString();
+  }
+
+  /// Checks if a relay URL already exists in the set (case-insensitive).
+  static bool _isDuplicateRelay(
+    String normalizedUrl,
+    Set<String> existingRelays,
+  ) {
+    final newLower = normalizedUrl.toLowerCase();
+    for (final existing in existingRelays) {
+      if (existing.toLowerCase() == newLower) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /// Gets the best connection status color for a relay from pool state.
+  /// Returns green for streaming/loading, yellow for connecting/waiting,
+  /// red for failed, grey for disconnected/not found.
+  static Color _getRelayStatusColor(PoolState? poolState, String relayUrl) {
+    if (poolState == null) return Colors.grey;
+
+    final subscriptions = poolState.subscriptions;
+    final relayLower = relayUrl.toLowerCase();
+
+    RelaySubPhase? bestPhase;
+
+    for (final sub in subscriptions.values) {
+      for (final entry in sub.relays.entries) {
+        if (entry.key.toLowerCase() == relayLower) {
+          final phase = entry.value.phase;
+          // Prioritize: streaming > loading > connecting > waiting > others
+          if (bestPhase == null ||
+              _phasePriority(phase) > _phasePriority(bestPhase)) {
+            bestPhase = phase;
+          }
+        }
+      }
+    }
+
+    if (bestPhase == null) return Colors.grey;
+
+    return switch (bestPhase) {
+      RelaySubPhase.streaming => Colors.green,
+      RelaySubPhase.loading => Colors.green,
+      RelaySubPhase.connecting => Colors.amber,
+      RelaySubPhase.waiting => Colors.amber,
+      RelaySubPhase.failed => Colors.red,
+      RelaySubPhase.disconnected => Colors.grey,
+      RelaySubPhase.closed => Colors.grey,
+    };
+  }
+
+  static int _phasePriority(RelaySubPhase phase) {
+    return switch (phase) {
+      RelaySubPhase.streaming => 6,
+      RelaySubPhase.loading => 5,
+      RelaySubPhase.connecting => 4,
+      RelaySubPhase.waiting => 3,
+      RelaySubPhase.failed => 2,
+      RelaySubPhase.disconnected => 1,
+      RelaySubPhase.closed => 0,
+    };
+  }
+}
diff --git a/pubspec.lock b/pubspec.lock
index 607adb5..41adf14 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -5,8 +5,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: "4d065ba"
-      resolved-ref: "4d065badcef18ea397dff40c46fcce114ecca12a"
+      ref: "6cbedbe"
+      resolved-ref: "6cbedbe6ae58a952c564979002258840921b041b"
       url: "https://github.com/purplebase/amber_signer"
     source: git
     version: "0.2.0"
@@ -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/pubspec.yaml b/pubspec.yaml
index 453f415..cda80bc 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -71,7 +71,7 @@ dependency_overrides:
     # path: ../amber_signer
     git:
       url: https://github.com/purplebase/amber_signer
-      ref: 4d065ba
+      ref: 6cbedbe
 
 dev_dependencies:
   flutter_test:
diff --git a/spec/features/FEAT-001-package-manager.md b/spec/features/FEAT-001-package-manager.md
deleted file mode 100644
index 83b8b81..0000000
--- a/spec/features/FEAT-001-package-manager.md
+++ /dev/null
@@ -1,122 +0,0 @@
-# FEAT-001 — Package Manager
-
-## Goal
-
-Single source of truth for installed packages and active install operations.
-Manages the complete lifecycle: download → verify → install, with pause/resume/cancel support.
-
-## Non-Goals
-
-- Managing non-APK file types
-- Auto-updating without user awareness
-- Installing from sources other than Nostr-published releases
-
-## User-Visible Behavior
-
-### Download Phase
-
-- User taps "Install" → download begins, progress shown
-- User can pause/resume/cancel active downloads
-- Multiple downloads queue automatically (max 3 concurrent)
-- "Update All" queues all updates immediately with visual feedback
-
-### Verification Phase
-
-- After download completes, hash verification runs
-- Verification state is visible (not hidden)
-- Hash mismatch blocks install with clear error
-
-### Permission Phase
-
-- If "Install unknown apps" permission not granted, user is prompted
-- Permission state is explicit in UI
-- Once granted, all waiting installs advance automatically
-
-### Install Phase
-
-- Native Android install dialog shown
-- One install dialog at a time (serialized)
-- If user dismisses dialog, install shows "Tap to retry" state
-- Success updates installed list immediately (no stale UI)
-
-### Failure States
-
-- Download failed → clear error, can retry
-- Hash mismatch → error, cannot proceed
-- Certificate mismatch → offer "Uninstall and reinstall" option
-- Permission denied → guidance to enable in Settings
-
-## State Machine
-
-Operations follow this sealed class hierarchy (`install_operation.dart`):
-
-```
-DownloadQueued → Downloading ↔ DownloadPaused
-                      ↓
-                 Verifying
-                      ↓
-              AwaitingPermission (if needed)
-                      ↓
-               ReadyToInstall
-                      ↓
-                Installing → AwaitingUserAction (if dismissed)
-                      ↓
-             [cleared] or OperationFailed
-```
-
-State transitions are unidirectional except Downloading ↔ DownloadPaused.
-
-## Edge Cases
-
-- Network drops mid-download → download pauses or fails gracefully, can retry
-- App backgrounded during install → install completes, UI updates on return
-- 404 from origin server → automatic CDN fallback before failing
-- Stale operations (>7 days) → garbage collected on app restart
-- Android package DB race condition → state updated from target metadata, not sync
-
-## Invariants
-
-These are non-negotiable. Violations mean the implementation is broken.
-
-1. **UI never blocks** — `install()` returns immediately; events drive state via EventChannel
-2. **One install dialog at a time** — Android PackageInstaller limitation, enforced by serialization
-3. **Hash verification before install** — Native side verifies before install session opens
-4. **Permission flow is explicit** — `AwaitingPermission` state exists for UI feedback
-5. **Downloaded files are cleaned up** — Deleted after success or dismissal
-6. **No polling** — All state changes via callbacks/events, never periodic checks
-
-## Integration Boundaries
-
-```
-┌─────────────────────────────────────────────────────────────┐
-│ PackageManager (Dart)                                       │
-│   - State machine owner                                     │
-│   - Download management (background_downloader)             │
-│   - Orchestrates flow                                       │
-└─────────────────────────┬───────────────────────────────────┘
-                          │ MethodChannel / EventChannel
-┌─────────────────────────▼───────────────────────────────────┐
-│ AndroidPackageManagerPlugin (Kotlin)                        │
-│   - Hash verification                                       │
-│   - PackageInstaller session                                │
-│   - Permission checks                                       │
-│   - Emits: verifying/started/success/failed/cancelled       │
-└─────────────────────────────────────────────────────────────┘
-```
-
-## Acceptance Criteria
-
-- [ ] User can download, pause, resume, cancel downloads
-- [ ] User can install apps with proper verification
-- [ ] Multiple downloads queue correctly (max 3 concurrent)
-- [ ] Install failures show actionable error messages
-- [ ] Certificate mismatch offers force-update option
-- [ ] UI remains responsive throughout all operations
-- [ ] No operations block the UI thread
-
-## Files
-
-- `lib/services/package_manager/package_manager.dart` — Base class, state machine
-- `lib/services/package_manager/install_operation.dart` — State definitions
-- `lib/services/package_manager/android_package_manager.dart` — Android implementation
-- `android/.../AndroidPackageManagerPlugin.kt` — Native side
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.