Introduce a local mechanism for managing the app's badge count

ElementX/Sources/Services/Notification/Manager/NotificationManager.swift

@@ -158,6 +158,22 @@ final class NotificationManager: NSObject, NotificationManagerProtocol {
         notificationCenter.removeDeliveredNotifications(withIdentifiers: notificationsIdentifiers)
     }
     
+    func updateAppBadgeCount() async {
+        guard let userSession, appSettings.roomListNotificationCountEnabled else { return }
+        
+        let badgeCount = Int(userSession.clientProxy.totalUnreadNotifications)
+        
+        appSettings.lastKnownBadgeCount = badgeCount
+        
+        MXLog.debug("Updating app badge count to \(badgeCount)")
+        
+        do {
+            try await notificationCenter.setBadgeCount(badgeCount)
+        } catch {
+            MXLog.error("Failed updating the app badge count with error: \(error)")
+        }
+    }
+    
     private func removeReceivedWhileOfflineNotification() {
         notificationCenter.removeDeliveredNotifications(withIdentifiers: [NotificationServiceExtensionActor.receivedWhileOfflineNotificationID])
     }

ElementX/Sources/Services/Notification/Manager/NotificationManagerProtocol.swift

@@ -36,4 +36,6 @@ protocol NotificationManagerProtocol: AnyObject {
     func removeDeliveredMessageNotifications(for roomID: String) async
     
     func removeDeliveredNotificationsForFullyReadRooms(_ rooms: [RoomSummary]) async
+    
+    func updateAppBadgeCount() async
 }

ElementX/Sources/Services/Notification/Manager/UserNotificationCenterProtocol.swift

@@ -15,6 +15,7 @@ protocol UserNotificationCenterProtocol: AnyObject {
     func requestAuthorization(options: UNAuthorizationOptions) async throws -> Bool
     func deliveredNotifications() async -> [UNNotification]
     func removeDeliveredNotifications(withIdentifiers identifiers: [String])
+    func setBadgeCount(_ newBadgeCount: Int) async throws
     func setNotificationCategories(_ categories: Set<UNNotificationCategory>)
     func authorizationStatus() async -> UNAuthorizationStatus
     func notificationSettings() async -> UNNotificationSettings