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/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 {