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/Features/Profile/ViewModels/ProfileViewModel.swift

@@ -117,7 +117,6 @@ final class ProfileViewModel {
             realNameInfo = nil
             bankCardInfo = nil
         }
-        notifyStateChange()
     }
 
     func beginEditing() {

suixinkan/Features/Statistics/ViewModels/StatisticsViewModel.swift

@@ -73,7 +73,6 @@ final class StatisticsViewModel {
 
         do {
             statistics = try await fetchSummary(range: range, api: api)
-            notifyStateChange()
         } catch is CancellationError {
             return
         } catch {