Refactor travel segments and simplify trip options

Travel segment architecture:
- Remove departureTime/arrivalTime from TravelSegment (location-based, not date-based)
- Fix travel sections appearing after destination instead of between cities
- Fix missing travel segments when revisiting same city (consecutive grouping)
- Remove unwanted rest day at end of trip

Planning engine fixes:
- All three planners now group only consecutive games at same stadium
- Visiting A → B → A creates 3 stops with proper travel between

UI simplification:
- Remove redundant sort options (mostDriving/leastDriving, mostCities/leastCities)
- Remove unused "Find Other Sports Along Route" toggle (was dead code)

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

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

SportsTime/Features/Trip/Views/TimelineItemView.swift

@@ -451,9 +451,7 @@ struct HorizontalTimelineItemView: View {
         toLocation: LocationInput(name: "San Francisco"),
         travelMode: .drive,
         distanceMeters: 600000,
-        durationSeconds: 21600,
-        departureTime: Date(),
-        arrivalTime: Date().addingTimeInterval(21600)
+        durationSeconds: 21600
     )
 
     let option = ItineraryOption(