feat(debug): add bulk share image export and stadium visit tools

Adds debug-only DebugShareExporter that bulk-exports ~298 shareable
image variations (achievement cards, progress cards, trip cards, icons)
to Documents/DebugExport/ for visual QA. Also adds a button to populate
all stadium visits for testing the fully-unlocked app state.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

SportsTime/Features/Settings/Views/SettingsView.swift

@@ -15,6 +15,8 @@ struct SettingsView: View {
     #if DEBUG
     @State private var selectedSyncStatus: EntitySyncStatus?
     @State private var showSyncLogs = false
+    @State private var exporter = DebugShareExporter()
+    @State private var showExportProgress = false
     #endif
 
     var body: some View {
@@ -348,12 +350,30 @@ struct SettingsView: View {
             } label: {
                 Label("Reset Onboarding Flag", systemImage: "arrow.counterclockwise")
             }
+
+            Button {
+                showExportProgress = true
+                Task {
+                    await exporter.exportAll(modelContext: modelContext)
+                }
+            } label: {
+                Label("Export All Shareables", systemImage: "square.and.arrow.up.on.square")
+            }
+
+            Button {
+                Task { await exporter.addAllStadiumVisits(modelContext: modelContext) }
+            } label: {
+                Label("Add All Stadium Visits", systemImage: "mappin.and.ellipse")
+            }
         } header: {
             Text("Debug")
         } footer: {
             Text("These options are only visible in debug builds.")
         }
         .listRowBackground(Theme.cardBackground(colorScheme))
+        .sheet(isPresented: $showExportProgress) {
+            DebugExportProgressView(exporter: exporter)
+        }
     }
 
     private var syncStatusSection: some View {