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>

SportsTimeTests/TravelEstimatorTests.swift

@@ -326,18 +326,8 @@ struct TravelEstimatorTests {
         #expect(twoDrivers != nil, "Should succeed with two drivers - within 32h limit")
     }
 
-    @Test("estimate stops - calculates departure and arrival times")
-    func estimateStops_CalculatesTimes() {
-        let baseDate = Calendar.current.date(from: DateComponents(year: 2026, month: 4, day: 5))!
-        let stop1 = makeStop(city: "Los Angeles", latitude: 34.0522, longitude: -118.2437, departureDate: baseDate)
-        let stop2 = makeStop(city: "San Diego", latitude: 32.7157, longitude: -117.1611)
-
-        let segment = TravelEstimator.estimate(from: stop1, to: stop2, constraints: defaultConstraints())
-
-        #expect(segment != nil)
-        #expect(segment!.departureTime > baseDate, "Departure should be after base date (adds 8 hours)")
-        #expect(segment!.arrivalTime > segment!.departureTime, "Arrival should be after departure")
-    }
+    // Note: departure/arrival time tests removed - travel is now location-based, not time-based
+    // The user decides when to travel; segments only describe route info (distance, duration)
 
     @Test("estimate stops - distance and duration are consistent")
     func estimateStops_DistanceDurationConsistent() {