Fix home navigation bar visibility and hide scan tab title.

Home uses a custom top bar, so TabNavigationController now syncs system nav bar visibility with the stack top; remove the scan tab text label to show icon only.

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

suixinkan_iosTests/MainScanTabItemTests.swift

@@ -35,7 +35,7 @@ final class MainScanTabItemTests: XCTestCase {
         controller.loadViewIfNeeded()
 
         let scanItem = try XCTUnwrap(controller.viewControllers?[2].tabBarItem)
-        XCTAssertEqual(scanItem.title, "扫码")
+        XCTAssertNil(scanItem.title)
         XCTAssertEqual(scanItem.accessibilityIdentifier, "main.scan")
         XCTAssertEqual(scanItem.accessibilityLabel, "扫码核销")
         XCTAssertNotNil(scanItem.image)

suixinkan_iosTests/NavigationRouterTests.swift

@@ -27,6 +27,20 @@ final class AppNavigatorTests: XCTestCase {
         XCTAssertTrue(homeStack.viewControllers.last is PaymentCollectionViewController)
     }
 
+    /// 测试首页隐藏系统导航栏，push 子页面后显示，返回首页后重新隐藏。
+    func testHomeNavigationBarVisibilityFollowsTopViewController() {
+        let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))
+        let navigationController = TabNavigationController(tab: .home, services: services)
+
+        XCTAssertTrue(navigationController.isNavigationBarHidden)
+
+        navigationController.push(route: .home(.paymentCollection), animated: false)
+        XCTAssertFalse(navigationController.isNavigationBarHidden)
+
+        navigationController.popToRootViewController(animated: false)
+        XCTAssertTrue(navigationController.isNavigationBarHidden)
+    }
+
     /// 测试 tabRoot 会切换到指定 Tab、清空旧栈并打开目标页。
     func testTabRootSelectsTabResetsStackAndPushesRoute() {
         let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))