Use the new notification sound. (#4572)

* Use the new notification sound.

* Add a banner informing the user of the new notification sound.

ElementX/Sources/Application/AppCoordinator.swift

@@ -437,6 +437,11 @@ class AppCoordinator: AppCoordinatorProtocol, AuthenticationFlowCoordinatorDeleg
             await userSession.clientProxy.expireSyncSessions()
         }
         
+        if oldVersion < Version(25, 10, 0) {
+            MXLog.info("Migrating to version 25.10.0, showing new sound banner to existing user.")
+            appSettings.hasSeenNewSoundBanner = false
+        }
+        
         userSessionMigrationsOldVersion = nil
     }
     

ElementX/Sources/Application/Settings/AppSettings.swift

@@ -29,6 +29,7 @@ final class AppSettings {
     private enum UserDefaultsKeys: String {
         case lastVersionLaunched
         case seenInvites
+        case hasSeenNewSoundBanner
         case appLockNumberOfPINAttempts
         case appLockNumberOfBiometricAttempts
         case timelineStyle
@@ -161,6 +162,10 @@ final class AppSettings {
     @UserPreference(key: UserDefaultsKeys.seenInvites, defaultValue: [], storageType: .userDefaults(store))
     var seenInvites: Set<String>
     
+    /// Defaults to `true` for new users, and we use a migration to set it to `false` for existing users.
+    @UserPreference(key: UserDefaultsKeys.hasSeenNewSoundBanner, defaultValue: true, storageType: .userDefaults(store))
+    var hasSeenNewSoundBanner
+    
     /// The initial set of account providers shown to the user in the authentication flow.
     ///
     /// Account provider is the friendly term for the server name. It should not contain an `https` prefix and should