feat: 接入消息未读数、全部已读与首页红点角标同步。

固定消息中心为首页入口，并在推送到达、已读后刷新桌面角标。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkanTests/PushNotificationTests.swift

@@ -158,6 +158,28 @@ final class PushNotificationTests: XCTestCase {
         XCTAssertEqual(router.destinations, [.task])
     }
 
+    func testRemoteNotificationNotifiesUnreadMessageStateChange() async {
+        let manager = makeManager()
+        let unreadChanged = expectation(
+            forNotification: NotificationName.unreadMessageCountDidChange,
+            object: nil
+        )
+
+        manager.handleRemoteNotification(["route": "message_center"])
+
+        await fulfillment(of: [unreadChanged], timeout: 1)
+    }
+
+    func testApplicationIconBadgeUsesLatestNonnegativeCount() async {
+        let badgeSetter = ApplicationIconBadgeSetterMock()
+        let manager = makeManager(badgeSetter: badgeSetter)
+
+        await manager.updateApplicationIconBadgeCount(12)
+        await manager.updateApplicationIconBadgeCount(-2)
+
+        XCTAssertEqual(badgeSetter.counts, [12, 0])
+    }
+
     func testRouteCoordinatorWaitsForLoginAndDeduplicatesColdStartResponse() {
         let coordinator = PushRouteCoordinator(appStore: appStore)
         let window = UIWindow(frame: UIScreen.main.bounds)
@@ -189,7 +211,8 @@ final class PushNotificationTests: XCTestCase {
     private func makeManager(
         sdk: PushSDKMock? = nil,
         api: PushRegistrationAPIMock? = nil,
-        router: PushRouterMock? = nil
+        router: PushRouterMock? = nil,
+        badgeSetter: ApplicationIconBadgeSetterMock? = nil
     ) -> PushNotificationManager {
         let resolvedSDK: PushSDKMock
         if let sdk {
@@ -217,7 +240,8 @@ final class PushNotificationTests: XCTestCase {
             api: resolvedAPI,
             appStore: appStore,
             defaults: defaults,
-            router: resolvedRouter
+            router: resolvedRouter,
+            applicationIconBadgeSetter: badgeSetter ?? ApplicationIconBadgeSetterMock()
         )
     }
 
@@ -233,6 +257,16 @@ final class PushNotificationTests: XCTestCase {
     }
 }
 
+/// 记录 App 桌面图标角标更新的测试替身。
+@MainActor
+private final class ApplicationIconBadgeSetterMock: ApplicationIconBadgeSetting {
+    private(set) var counts: [Int] = []
+
+    func setBadgeCount(_ count: Int) async {
+        counts.append(count)
+    }
+}
+
 /// 可控的极光 SDK 测试替身，记录初始化与通知授权行为。
 @MainActor
 private final class PushSDKMock: PushSDKProviding {