Add Lottie global loading overlay and fix stuck loading states.

Replace per-VC activity indicators with a ref-counted GlobalLoadingManager, and resolve duplicate show/hide calls on Profile, Statistics, and Home tabs.

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

suixinkan/Base/BaseViewController.swift

@@ -9,9 +9,6 @@ import UIKit
 /// 业务 ViewController 基类，提供统一的 UI 搭建流程与通用 UI 能力。
 class BaseViewController: UIViewController {
 
-    private var loadingOverlay: UIView?
-    private var loadingIndicator: UIActivityIndicatorView?
-
     // MARK: - Lifecycle
 
     override func viewDidLoad() {
@@ -47,36 +44,14 @@ class BaseViewController: UIViewController {
 
     // MARK: - Loading
 
+    @MainActor
     func showLoading() {
-        if loadingOverlay == nil {
-            let overlay = UIView()
-            overlay.backgroundColor = UIColor.black.withAlphaComponent(0.1)
-
-            let indicator = UIActivityIndicatorView(style: .large)
-            indicator.hidesWhenStopped = true
-
-            view.addSubview(overlay)
-            overlay.addSubview(indicator)
-
-            overlay.snp.makeConstraints { make in
-                make.edges.equalToSuperview()
-            }
-            indicator.snp.makeConstraints { make in
-                make.center.equalToSuperview()
-            }
-
-            loadingOverlay = overlay
-            loadingIndicator = indicator
-        }
-
-        loadingOverlay?.isHidden = false
-        loadingIndicator?.startAnimating()
-        view.bringSubviewToFront(loadingOverlay!)
+        GlobalLoadingManager.shared.show()
     }
 
+    @MainActor
     func hideLoading() {
-        loadingIndicator?.stopAnimating()
-        loadingOverlay?.isHidden = true
+        GlobalLoadingManager.shared.hide()
     }
 
     // MARK: - Toast / Alert
@@ -156,7 +131,7 @@ class BaseViewController: UIViewController {
     }
 
     @objc private func handleSessionDidExpireNotification() {
-        hideLoading()
+        GlobalLoadingManager.shared.hideAll()
         onSessionDidExpire()
     }
 }