feat(planning): add trip filtering and fix departure date logic

- Add Trip.status property for status tracking
- Add RouteFilters trip list methods (filterBySport, filterByDateRange, filterByStatus, applyFilters)
- Add TravelEstimator max driving hours validation
- Fix ScenarioA/B departureDate to use last game day (not day after)
- Update GameDAGRouter comments for buffer logic

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

SportsTime/Planning/Engine/TravelEstimator.swift

@@ -20,7 +20,7 @@ enum TravelEstimator {
     // MARK: - Travel Estimation
 
     /// Estimates a travel segment between two stops.
-    /// Always creates a segment - feasibility is checked by GameDAGRouter.
+    /// Returns nil if trip exceeds maximum allowed driving hours (2 days worth).
     static func estimate(
         from: ItineraryStop,
         to: ItineraryStop,
@@ -30,6 +30,12 @@ enum TravelEstimator {
         let distanceMiles = calculateDistanceMiles(from: from, to: to)
         let drivingHours = distanceMiles / averageSpeedMph
 
+        // Maximum allowed: 2 days of driving
+        let maxAllowedHours = constraints.maxDailyDrivingHours * 2.0
+        if drivingHours > maxAllowedHours {
+            return nil
+        }
+
         return TravelSegment(
             fromLocation: from.location,
             toLocation: to.location,
@@ -40,7 +46,7 @@ enum TravelEstimator {
     }
 
     /// Estimates a travel segment between two LocationInputs.
-    /// Returns nil only if coordinates are missing.
+    /// Returns nil if coordinates are missing or if trip exceeds maximum allowed driving hours (2 days worth).
     static func estimate(
         from: LocationInput,
         to: LocationInput,
@@ -56,6 +62,12 @@ enum TravelEstimator {
         let distanceMiles = distanceMeters * 0.000621371 * roadRoutingFactor
         let drivingHours = distanceMiles / averageSpeedMph
 
+        // Maximum allowed: 2 days of driving
+        let maxAllowedHours = constraints.maxDailyDrivingHours * 2.0
+        if drivingHours > maxAllowedHours {
+            return nil
+        }
+
         return TravelSegment(
             fromLocation: from,
             toLocation: to,