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/Progress/Views/Components/GamesHistoryRow.swift

@@ -1,6 +1,7 @@
 import SwiftUI
 
 struct GamesHistoryRow: View {
+    @Environment(\.colorScheme) private var colorScheme
     let visit: StadiumVisit
     let stadium: Stadium?
 
@@ -20,16 +21,17 @@ struct GamesHistoryRow: View {
                 // Date
                 Text(visit.visitDate.formatted(date: .abbreviated, time: .omitted))
                     .font(.subheadline.bold())
+                    .foregroundStyle(Theme.textPrimary(colorScheme))
 
                 // Teams (if game)
                 if let matchup = visit.matchupDescription {
                     Text(matchup)
                         .font(.caption)
-                        .foregroundStyle(.secondary)
+                        .foregroundStyle(Theme.textSecondary(colorScheme))
                 } else {
                     Text(visit.stadiumNameAtVisit)
                         .font(.caption)
-                        .foregroundStyle(.secondary)
+                        .foregroundStyle(Theme.textSecondary(colorScheme))
                 }
             }
 
@@ -38,11 +40,11 @@ struct GamesHistoryRow: View {
             // Chevron
             Image(systemName: "chevron.right")
                 .font(.caption)
-                .foregroundStyle(.tertiary)
+                .foregroundStyle(Theme.textMuted(colorScheme))
                 .accessibilityHidden(true)
         }
         .padding()
-        .background(Color(.systemBackground))
+        .background(Theme.cardBackground(colorScheme))
         .clipShape(RoundedRectangle(cornerRadius: 10))
         .accessibilityElement(children: .combine)
     }