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/DebugShareExporter.swift

@@ -381,6 +381,53 @@ final class DebugShareExporter {
         isExporting = false
     }
 
+    // MARK: - Save Sample Trips
+
+    func saveSampleTrips(modelContext: ModelContext) {
+        let trips = Self.buildDummyTrips()
+        var savedCount = 0
+
+        for trip in trips {
+            if let savedTrip = SavedTrip.from(trip, status: .planned) {
+                modelContext.insert(savedTrip)
+                savedCount += 1
+            }
+        }
+
+        do {
+            try modelContext.save()
+            print("DEBUG: Saved \(savedCount) sample trips")
+        } catch {
+            print("DEBUG: Failed to save sample trips: \(error)")
+        }
+    }
+
+    // MARK: - Build Sample Poll
+
+    static func buildSamplePoll() -> TripPoll {
+        let trips = buildDummyTrips()
+        let sampleVotes = [
+            PollVote(pollId: UUID(), odg: "voter1", rankings: [0, 2, 1, 3]),
+            PollVote(pollId: UUID(), odg: "voter2", rankings: [2, 0, 3, 1]),
+            PollVote(pollId: UUID(), odg: "voter3", rankings: [0, 1, 2, 3]),
+        ]
+        _ = sampleVotes // votes are shown via PollResults, we pass them separately
+
+        return TripPoll(
+            title: "Summer 2026 Road Trip",
+            ownerId: "debug-user",
+            tripSnapshots: trips
+        )
+    }
+
+    static func buildSampleVotes(for poll: TripPoll) -> [PollVote] {
+        [
+            PollVote(pollId: poll.id, odg: "voter-alex", rankings: [0, 2, 1, 3]),
+            PollVote(pollId: poll.id, odg: "voter-sam", rankings: [2, 0, 3, 1]),
+            PollVote(pollId: poll.id, odg: "voter-jordan", rankings: [0, 1, 2, 3]),
+        ]
+    }
+
     // MARK: - Add All Stadium Visits
 
     func addAllStadiumVisits(modelContext: ModelContext) async {