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/UI/Home/HomeViewController.swift

@@ -122,8 +122,9 @@ final class HomeViewController: BaseViewController {
 
     private func initializeHome() async {
         showLoading()
-        defer { hideLoading() }
         await viewModel.initialize(api: homeAPI)
+        hideLoading()
+
         applyViewModel()
         await evaluateDialogsWithDelay()
         await viewModel.refreshLocationInfo()