feat(ui): replace loading indicators with Apple-style LoadingSpinner

- Add LoadingSpinner component with small/medium/large sizes using system gray color
- Add LoadingPlaceholder for skeleton loading states
- Add LoadingSheet for full-screen blocking overlays
- Replace ThemedSpinner/ThemedSpinnerCompact across all views
- Remove deprecated loading components from AnimatedComponents.swift
- Delete LoadingTextGenerator.swift
- Fix PhotoImportView layout to fill full width

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

SportsTime/Features/Progress/Views/PhotoImportView.swift

@@ -23,7 +23,7 @@ struct PhotoImportView: View {
 
     var body: some View {
         NavigationStack {
-            VStack(spacing: 0) {
+            Group {
                 if viewModel.isProcessing {
                     processingView
                 } else if viewModel.processedPhotos.isEmpty {
@@ -32,6 +32,7 @@ struct PhotoImportView: View {
                     resultsView
                 }
             }
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
             .themedBackground()
             .navigationTitle("Import from Photos")
             .navigationBarTitleDisplayMode(.inline)
@@ -161,15 +162,17 @@ struct PhotoImportView: View {
         VStack(spacing: Theme.Spacing.lg) {
             Spacer()
 
-            ThemedSpinner(size: 50, lineWidth: 4)
+            LoadingSpinner(size: .large)
 
-            Text("Processing photos...")
-                .font(.body)
-                .foregroundStyle(Theme.textSecondary(colorScheme))
+            VStack(spacing: Theme.Spacing.xs) {
+                Text("Processing Photos")
+                    .font(.headline)
+                    .foregroundStyle(Theme.textPrimary(colorScheme))
 
-            Text("\(viewModel.processedCount) of \(viewModel.totalCount) photos")
-                .font(.subheadline)
-                .foregroundStyle(Theme.textMuted(colorScheme))
+                Text("\(viewModel.processedCount) of \(viewModel.totalCount)")
+                    .font(.subheadline)
+                    .foregroundStyle(Theme.textSecondary(colorScheme))
+            }
 
             Spacer()
         }