Migrate from iOS 17 Observation to iOS 16-compatible Combine architecture.

Lower deployment target to iOS 16, replace @Observable with ObservableObject, add navigation and UI compatibility shims, and include login smoke UI tests.

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

suixinkan/Features/ScenicSettlement/ViewModels/ScenicSettlementViewModels.swift

@@ -6,24 +6,23 @@
 //
 
 import Foundation
-import Observation
+import Combine
 import SwiftUI
 
 @MainActor
-@Observable
 /// 景区结算申请 ViewModel，管理可申请景区、多选、金额备注和提交。
-final class ScenicSettlementViewModel {
-    var existingScenics: [BusinessScope] = []
-    var options: [ScenicSettlementOption] = []
-    var amountText = ""
-    var remarkText = ""
-    var isLoading = false
-    var isSubmitting = false
-    var loadFailed = false
-    var loadFailureReason: String?
-    var message: String?
+final class ScenicSettlementViewModel: ObservableObject {
+    @Published var existingScenics: [BusinessScope] = []
+    @Published var options: [ScenicSettlementOption] = []
+    @Published var amountText = ""
+    @Published var remarkText = ""
+    @Published var isLoading = false
+    @Published var isSubmitting = false
+    @Published var loadFailed = false
+    @Published var loadFailureReason: String?
+    @Published var message: String?
 
-    private var selectedIds = Set<Int>()
+    @Published private var selectedIds = Set<Int>()
 
     /// 已选择景区数量。
     var selectedCount: Int {
@@ -176,16 +175,15 @@ enum ScenicSettlementAmountValidation: Equatable {
 }
 
 @MainActor
-@Observable
 /// 景区结算审核 ViewModel，聚合景区申请和权限申请审核记录。
-final class ScenicSettlementReviewViewModel {
-    var scenicApplications: [ScenicApplicationPendingResponse] = []
-    var roleApplications: [RoleApplyPendingResponse] = []
-    var isLoading = false
-    var message: String?
-    var loadFailedAll = false
-    var scenicLoadFailed = false
-    var roleLoadFailed = false
+final class ScenicSettlementReviewViewModel: ObservableObject {
+    @Published var scenicApplications: [ScenicApplicationPendingResponse] = []
+    @Published var roleApplications: [RoleApplyPendingResponse] = []
+    @Published var isLoading = false
+    @Published var message: String?
+    @Published var loadFailedAll = false
+    @Published var scenicLoadFailed = false
+    @Published var roleLoadFailed = false
 
     /// 待审核记录数量。
     var pendingCount: Int {