fix: remove .zoom transition causing trip card disappearance on back

ROOT CAUSE: .navigationTransition(.zoom) + .matchedTransitionSource
in a paged TabView. When navigating back, the zoom tries to animate
to the source card, but the TabView may have recycled/repositioned
the page. The animation targets a stale frame, causing the card to
flash black or disappear.

FIX: Removed .zoom transitions and .matchedTransitionSource from
both UpcomingTripsPageView and PastTripsSection. Standard push/pop
navigation is stable with paged TabViews.

Also removed all debug logging.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ios/Platform/Platform/Features/Trips/ViewModels/TripsViewModel.swift

@@ -27,11 +27,8 @@ final class TripsViewModel {
         error = nil
 
         do {
-            let fetched = try await api.getTrips()
+            trips = try await api.getTrips()
-            print("[TRIPS] loadTrips: fetched \(fetched.count) trips")
-            trips = fetched
         } catch {
-            print("[TRIPS] loadTrips ERROR: \(error)")
             self.error = error.localizedDescription
         }
         isLoading = false
@@ -40,11 +37,8 @@ final class TripsViewModel {
     func refresh() async {
         isLoading = true
         do {
-            let fetched = try await api.getTrips()
+            trips = try await api.getTrips()
-            print("[TRIPS] refresh: fetched \(fetched.count) trips")
-            trips = fetched
         } catch {
-            print("[TRIPS] refresh ERROR: \(error)")
             self.error = error.localizedDescription
         }
         isLoading = false

ios/Platform/Platform/Features/Trips/Views/PastTripsSection.swift

@@ -4,10 +4,8 @@ import SwiftUI
 /// Adapted from Apple's Wishlist TripCollectionView.
 struct PastTripsSection: View {
     let trips: [Trip]
-    let namespace: Namespace.ID
 
     var body: some View {
-        let _ = { print("[TRIPS] PastTripsSection body — trips=\(trips.count) ids=\(trips.map(\.id))") }()
         if !trips.isEmpty {
             Section {
                 ScrollView(.horizontal) {
@@ -15,11 +13,8 @@ struct PastTripsSection: View {
                         ForEach(trips) { trip in
                             NavigationLink {
                                 TripPlaceholderView(trip: trip)
-                                    .navigationTransition(
-                                        .zoom(sourceID: trip.id, in: namespace))
                             } label: {
                                 TripCard(trip: trip, size: .compact)
-                                    .matchedTransitionSource(id: trip.id, in: namespace)
                                     .contentShape(.rect)
                             }
                             .buttonStyle(.plain)

ios/Platform/Platform/Features/Trips/Views/TripsHomeView.swift

@@ -10,8 +10,6 @@ import SwiftUI
 struct TripsHomeView: View {
     @State private var vm = TripsViewModel()
 
-    @Namespace private var namespace
-
     var body: some View {
         NavigationStack {
             Group {
@@ -26,7 +24,7 @@ struct TripsHomeView: View {
                                 .padding(.bottom, 20)
 
                             // Secondary: past trips (horizontal scroll, compact cards)
-                            PastTripsSection(trips: vm.pastTrips, namespace: namespace)
+                            PastTripsSection(trips: vm.pastTrips)
                         }
                     }
                     .contentMargins(.bottom, 30, for: .scrollContent)
@@ -37,12 +35,6 @@ struct TripsHomeView: View {
                 }
             }
             .background(Color.canvas)
-            .onAppear {
-                print("[TRIPS] TripsHomeView onAppear — trips=\(vm.trips.count) upcoming=\(vm.upcomingTrips.count) past=\(vm.pastTrips.count) isLoading=\(vm.isLoading)")
-            }
-            .onChange(of: vm.trips.count) { old, new in
-                print("[TRIPS] trips count changed \(old) → \(new)")
-            }
             .toolbar {
                 // Custom expanded title — Wishlist pattern
                 ToolbarItem(placement: .title) {

ios/Platform/Platform/Features/Trips/Views/UpcomingTripsPageView.swift

@@ -5,10 +5,7 @@ import SwiftUI
 struct UpcomingTripsPageView: View {
     let trips: [Trip]
 
-    @Namespace private var namespace
-
     var body: some View {
-        let _ = { print("[TRIPS] UpcomingTripsPageView body — trips=\(trips.count) ids=\(trips.map(\.id))") }()
         if trips.isEmpty {
             // No upcoming trips — show a prompt
             VStack(spacing: 16) {
@@ -29,10 +26,6 @@ struct UpcomingTripsPageView: View {
                 ForEach(trips) { trip in
                     NavigationLink {
                         TripPlaceholderView(trip: trip)
-                            .navigationTransition(
-                                .zoom(sourceID: trip.id, in: namespace))
-                            .onAppear { print("[TRIPS] detail onAppear: \(trip.name)") }
-                            .onDisappear { print("[TRIPS] detail onDisappear: \(trip.name)") }
                     } label: {
                         TripImageView(url: trip.imageURL, fallbackName: trip.name)
                             .overlay(alignment: .bottomLeading) {
@@ -55,7 +48,6 @@ struct UpcomingTripsPageView: View {
                                 .padding(.horizontal)
                                 .padding(.bottom, 54)
                             }
-                            .matchedTransitionSource(id: trip.id, in: namespace)
                     }
                     .buttonStyle(.plain)
                 }