Refactor trip planning: DAG router + trip options UI + simplified itinerary

- Replace O(2^n) GeographicRouteExplorer with O(n) GameDAGRouter using DAG + beam search
- Add geographic diversity to route selection (returns routes from distinct regions)
- Add trip options selector UI (TripOptionsView, TripOptionCard) to choose between routes
- Simplify itinerary display: separate games and travel segments by date
- Remove complex ItineraryDay bundling, query games/travel directly per day
- Update ScenarioA/B/C planners to use GameDAGRouter
- Add new test suites for planners and travel estimator

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

SportsTime/Core/Models/Domain/Sport.swift

@@ -4,6 +4,7 @@
 //
 
 import Foundation
+import SwiftUI
 
 enum Sport: String, Codable, CaseIterable, Identifiable {
     case mlb = "MLB"
@@ -34,6 +35,16 @@ enum Sport: String, Codable, CaseIterable, Identifiable {
         }
     }
 
+    var color: Color {
+        switch self {
+        case .mlb: return .red
+        case .nba: return .orange
+        case .nhl: return .blue
+        case .nfl: return .brown
+        case .mls: return .green
+        }
+    }
+
     var seasonMonths: ClosedRange<Int> {
         switch self {
         case .mlb: return 3...10  // March - October