fix: 12 planning engine bugs + App Store preview export at 886x1920

Planning engine fixes (from adversarial code review):
- Bug #1: sortByLeisure tie-breaking uses totalDrivingHours
- Bug #2: allDates/calculateRestDays guard-let-break prevents infinite loop
- Bug #3: same-day trip no longer rejected (>= in dateRange guard)
- Bug #4: ScenarioD rationale shows game count not stop count
- Bug #5: ScenarioD departureDate advanced to next day after last game
- Bug #6: ScenarioC date range boundary uses <= instead of <
- Bug #7: DrivingConstraints clamps maxHoursPerDriverPerDay via max(1.0,...)
- Bug #8: effectiveTripDuration uses inclusive day counting (+1)
- Bug #9: TripWizardViewModel validates endDate >= startDate
- Bug #10: allDates() uses min/max instead of first/last for robustness
- Bug #12: arrivalBeforeGameStart accounts for game end time at departure
- Bug #15: ScenarioBPlanner replaces force unwraps with safe unwrapping

Tests: 16 regression test suites + updated existing test expectations
Marketing: Remotion canvas set to 886x1920 for App Store preview spec

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

SportsTime/Planning/Engine/ScenarioDPlanner.swift

@@ -70,7 +70,8 @@ final class ScenarioDPlanner: ScenarioPlanner {
         // ──────────────────────────────────────────────────────────────────
         // Step 1: Validate team selection
         // ──────────────────────────────────────────────────────────────────
-        guard let teamId = request.preferences.followTeamId else {
+        guard let teamId = request.preferences.followTeamId
+                ?? request.preferences.selectedTeamIds.first else {
             return .failure(
                 PlanningFailure(
                     reason: .missingTeamSelection,
@@ -261,7 +262,7 @@ final class ScenarioDPlanner: ScenarioPlanner {
                 travelSegments: itinerary.travelSegments,
                 totalDrivingHours: itinerary.totalDrivingHours,
                 totalDistanceMiles: itinerary.totalDistanceMiles,
-                geographicRationale: "Follow Team: \(stops.count) games - \(cities)"
+                geographicRationale: "Follow Team: \(itinerary.stops.reduce(0) { $0 + $1.games.count }) games - \(cities)"
             )
             itineraryOptions.append(option)
         }
@@ -396,6 +397,7 @@ final class ScenarioDPlanner: ScenarioPlanner {
         )
 
         let lastGameDate = sortedGames.last?.gameDate ?? Date()
+        let calendar = Calendar.current
 
         return ItineraryStop(
             city: city,
@@ -403,7 +405,7 @@ final class ScenarioDPlanner: ScenarioPlanner {
             coordinate: coordinate,
             games: sortedGames.map { $0.id },
             arrivalDate: sortedGames.first?.gameDate ?? Date(),
-            departureDate: lastGameDate,
+            departureDate: calendar.date(byAdding: .day, value: 1, to: lastGameDate) ?? lastGameDate.addingTimeInterval(86400),
             location: location,
             firstGameStart: sortedGames.first?.startTime
         )