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/Trip/Views/Wizard/Steps/LocationSearchSheet.swift

@@ -24,6 +24,7 @@ struct LocationSearchSheet: View {
     let onAdd: (LocationInput) -> Void
 
     @Environment(\.dismiss) private var dismiss
+    @Environment(\.colorScheme) private var colorScheme
     @State private var searchText = ""
     @State private var searchResults: [LocationSearchResult] = []
     @State private var isSearching = false
@@ -47,7 +48,7 @@ struct LocationSearchSheet: View {
                 // Search field
                 HStack {
                     Image(systemName: "magnifyingglass")
-                        .foregroundStyle(.secondary)
+                        .foregroundStyle(Theme.textMuted(colorScheme))
                         .accessibilityHidden(true)
                     TextField("Search cities, addresses, places...", text: $searchText)
                         .textFieldStyle(.plain)
@@ -60,14 +61,14 @@ struct LocationSearchSheet: View {
                             searchResults = []
                         } label: {
                             Image(systemName: "xmark.circle.fill")
-                                .foregroundStyle(.secondary)
+                                .foregroundStyle(Theme.textMuted(colorScheme))
                         }
                         .minimumHitTarget()
                         .accessibilityLabel("Clear search")
                     }
                 }
                 .padding()
-                .background(Color(.secondarySystemBackground))
+                .background(Theme.cardBackgroundElevated(colorScheme))
                 .clipShape(RoundedRectangle(cornerRadius: 10))
                 .padding()
 
@@ -91,26 +92,28 @@ struct LocationSearchSheet: View {
                                     .accessibilityHidden(true)
                                 VStack(alignment: .leading) {
                                     Text(result.name)
-                                        .foregroundStyle(.primary)
+                                        .foregroundStyle(Theme.textPrimary(colorScheme))
                                     if !result.address.isEmpty {
                                         Text(result.address)
                                             .font(.caption)
-                                            .foregroundStyle(.secondary)
+                                            .foregroundStyle(Theme.textSecondary(colorScheme))
                                     }
                                 }
                                 Spacer()
                                 Image(systemName: "plus.circle")
-                                    .foregroundStyle(.blue)
+                                    .foregroundStyle(Theme.warmOrange)
                                     .accessibilityHidden(true)
                             }
                         }
                         .buttonStyle(.plain)
                     }
                     .listStyle(.plain)
+                    .scrollContentBackground(.hidden)
                 }
 
                 Spacer()
             }
+            .themedBackground()
             .navigationTitle(navigationTitle)
             .navigationBarTitleDisplayMode(.inline)
             .toolbar {