补充 Auth/Tasks/ScenicPermission/Live 单元测试，并完善 UI Test 登录与会话稳定性。

移除 LoginViewModel 硬编码账号，扩展登录流程测试覆盖；调整 ZLoginSmokeUITests 执行顺序与路由直达逻辑，避免清空 Keychain 影响其它用例。

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

suixinkanUITests/Support/LoginFlow.swift

@@ -18,6 +18,8 @@ enum LoginFlow {
     ) {
         guard app.isOnLoginScreen else { return }
 
+        app.application.activate()
+        app.waitForGlobalLoadingToDisappear()
         fillLoginForm(app: app, credentials: credentials)
         submitLogin(app: app)
         handleAccountSelectionIfNeeded(app: app, credentials: credentials)
@@ -34,17 +36,21 @@ enum LoginFlow {
     /// 填写登录表单并勾选协议。
     static func fillLoginForm(app: SuixinkanApp, credentials: UITestCredentials) {
         let usernameField = app.application.textFields["login.username"]
-        XCTAssertTrue(usernameField.waitForExistence(timeout: 8))
-        usernameField.tap()
-        usernameField.clearAndType(credentials.phone)
+        XCTAssertTrue(usernameField.waitForExistence(timeout: 12))
+
+        let currentPhone = usernameField.value as? String
+        if currentPhone != credentials.phone {
+            tapWhenReady(usernameField)
+            usernameField.clearAndType(credentials.phone)
+        }
 
         let passwordField = preferredPasswordField(in: app.application)
         XCTAssertTrue(passwordField.waitForExistence(timeout: 4))
-        passwordField.tap()
+        tapWhenReady(passwordField)
         passwordField.clearAndType(credentials.password)
 
         let privacyToggle = app.application.buttons["login.privacy"]
-        if privacyToggle.exists {
+        if privacyToggle.exists, privacyToggle.isHittable {
             privacyToggle.tap()
         }
     }
@@ -53,7 +59,7 @@ enum LoginFlow {
     static func submitLogin(app: SuixinkanApp) {
         let submitButton = app.application.buttons["login.submit"]
         XCTAssertTrue(submitButton.waitForExistence(timeout: 4))
-        submitButton.tap()
+        tapWhenReady(submitButton)
         app.waitForGlobalLoadingToDisappear()
     }
 
@@ -86,12 +92,26 @@ enum LoginFlow {
         }
         return app.textFields["login.password"]
     }
+
+    /// 等待元素可点后点击，不可点时退化为坐标点击。
+    private static func tapWhenReady(_ element: XCUIElement) {
+        let deadline = Date().addingTimeInterval(8)
+        while Date() < deadline {
+            if element.isHittable {
+                element.tap()
+                return
+            }
+            RunLoop.current.run(until: Date().addingTimeInterval(0.2))
+        }
+
+        element.coordinate(withNormalizedOffset: CGVector(dx: 0.5, dy: 0.5)).tap()
+    }
 }
 
 private extension XCUIElement {
     /// 清空并重新输入文本。
     func clearAndType(_ text: String) {
-        guard let currentValue = value as? String else {
+        guard let currentValue = value as? String, !currentValue.isEmpty else {
             typeText(text)
             return
         }