从 iOS 17 Observation 迁移至 iOS 16 兼容的 Combine 架构

将最低部署版本降至 iOS 16，以 ObservableObject 替换 @Observable，新增导航与 UI 兼容层，并补充登录冒烟 UI 测试。

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

suixinkan/Features/WithdrawalAudit/ViewModels/WithdrawalAuditViewModel.swift

@@ -6,7 +6,7 @@
 //
 
 import Foundation
-import Observation
+import Combine
 
 /// 提现审核筛选项，按提现记录的状态文案聚合审核视角。
 enum WithdrawalAuditFilter: String, CaseIterable, Identifiable {
@@ -27,20 +27,19 @@ enum WithdrawalAuditFilter: String, CaseIterable, Identifiable {
 }
 
 @MainActor
-@Observable
 /// 提现审核 ViewModel，负责提现记录分页、状态筛选和失败状态清理。
-final class WithdrawalAuditViewModel {
-    var records: [WalletWithdrawRecord] = []
-    var selectedFilter: WithdrawalAuditFilter = .all
-    var isLoading = false
-    var isLoadingMore = false
-    var loadFailed = false
-    var loadFailureReason: String?
-    var errorMessage: String?
+final class WithdrawalAuditViewModel: ObservableObject {
+    @Published var records: [WalletWithdrawRecord] = []
+    @Published var selectedFilter: WithdrawalAuditFilter = .all
+    @Published var isLoading = false
+    @Published var isLoadingMore = false
+    @Published var loadFailed = false
+    @Published var loadFailureReason: String?
+    @Published var errorMessage: String?
 
     private let pageSize = 10
-    private var page = 1
-    private var total = 0
+    @Published private var page = 1
+    @Published private var total = 0
 
     /// 当前筛选下的提现记录。
     var filteredRecords: [WalletWithdrawRecord] {

suixinkan/Features/WithdrawalAudit/Views/WithdrawalAuditView.swift

@@ -9,9 +9,9 @@ import SwiftUI
 
 /// 提现审核列表页，以审核视角展示钱包提现记录和处理进度。
 struct WithdrawalAuditView: View {
-    @Environment(WalletAPI.self) private var walletAPI
-    @Environment(ToastCenter.self) private var toastCenter
-    @State private var viewModel = WithdrawalAuditViewModel()
+    @Environment(\.walletAPI) private var walletAPI
+    @EnvironmentObject private var toastCenter: ToastCenter
+    @StateObject private var viewModel = WithdrawalAuditViewModel()
     @State private var selectedRecord: WalletWithdrawRecord?
 
     var body: some View {
@@ -37,7 +37,7 @@ struct WithdrawalAuditView: View {
                 WithdrawalAuditDetailView(record: record)
             }
         }
-        .onChange(of: viewModel.errorMessage) { _, message in
+        .onChange(of: viewModel.errorMessage) { message in
             guard let message else { return }
             toastCenter.show(message)
             viewModel.errorMessage = nil
@@ -82,7 +82,7 @@ struct WithdrawalAuditView: View {
                 .background(.white, in: RoundedRectangle(cornerRadius: 12))
         } else if viewModel.loadFailed && viewModel.records.isEmpty {
             VStack(spacing: AppMetrics.Spacing.small) {
-                ContentUnavailableView(
+                AppContentUnavailableView(
                     "提现审核记录加载失败",
                     systemImage: "exclamationmark.triangle",
                     description: Text(viewModel.loadFailureReason ?? "请检查网络后重试")
@@ -100,7 +100,7 @@ struct WithdrawalAuditView: View {
             .frame(maxWidth: .infinity, minHeight: 220)
             .background(.white, in: RoundedRectangle(cornerRadius: 12))
         } else if viewModel.filteredRecords.isEmpty {
-            ContentUnavailableView("暂无提现审核记录", systemImage: "tray", description: Text("可切换筛选条件或下拉刷新"))
+            AppContentUnavailableView("暂无提现审核记录", systemImage: "tray", description: Text("可切换筛选条件或下拉刷新"))
                 .frame(maxWidth: .infinity, minHeight: 220)
                 .background(.white, in: RoundedRectangle(cornerRadius: 12))
         } else {