feat: enforce custom Theme colors app-wide, add debug sample trips and poll

Replace all system colors (.secondary, Color(.secondarySystemBackground),
etc.) with Theme.textPrimary/textSecondary/textMuted/cardBackground/
surfaceGlow across 13 views. Remove PostHog debug logging. Add debug
settings for sample trips and hardcoded group poll preview.

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

SportsTime/Features/Settings/Views/SettingsView.swift

@@ -19,6 +19,8 @@ struct SettingsView: View {
     @State private var selectedSyncStatus: EntitySyncStatus?
     @State private var exporter = DebugShareExporter()
     @State private var showExportProgress = false
+    @State private var showSamplePoll = false
+    @State private var sampleTripsMessage: String?
     #endif
 
     var body: some View {
@@ -570,6 +572,19 @@ struct SettingsView: View {
             } label: {
                 Label("Add All Stadium Visits", systemImage: "mappin.and.ellipse")
             }
+
+            Button {
+                exporter.saveSampleTrips(modelContext: modelContext)
+                sampleTripsMessage = "Saved 4 sample trips!"
+            } label: {
+                Label("Save 4 Sample Trips", systemImage: "suitcase.fill")
+            }
+
+            Button {
+                showSamplePoll = true
+            } label: {
+                Label("View Sample Poll", systemImage: "chart.bar.doc.horizontal.fill")
+            }
         } header: {
             Text("Debug")
         } footer: {
@@ -579,6 +594,19 @@ struct SettingsView: View {
         .sheet(isPresented: $showExportProgress) {
             DebugExportProgressView(exporter: exporter)
         }
+        .sheet(isPresented: $showSamplePoll) {
+            NavigationStack {
+                DebugPollPreviewView()
+            }
+        }
+        .alert("Sample Trips", isPresented: Binding(
+            get: { sampleTripsMessage != nil },
+            set: { if !$0 { sampleTripsMessage = nil } }
+        )) {
+            Button("OK", role: .cancel) { sampleTripsMessage = nil }
+        } message: {
+            Text(sampleTripsMessage ?? "")
+        }
     }
 
     private var syncStatusSection: some View {