feat(itinerary): add custom itinerary items with drag-to-reorder

- Add CustomItineraryItem domain model with sortOrder for ordering
- Add CKCustomItineraryItem CloudKit wrapper for persistence
- Create CustomItemService for CRUD operations
- Create CustomItemSubscriptionService for real-time sync
- Add AppDelegate for push notification handling
- Add AddItemSheet for creating/editing items
- Add CustomItemRow with drag handle
- Update TripDetailView with continuous vertical timeline
- Enable drag-to-reorder using .draggable/.dropDestination
- Add inline "Add" buttons after games and travel segments

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

SportsTime/Features/Trip/Views/CustomItemRow.swift

@@ -0,0 +1,89 @@
+//
+//  CustomItemRow.swift
+//  SportsTime
+//
+//  Row component for custom itinerary items with drag handle
+//
+
+import SwiftUI
+
+struct CustomItemRow: View {
+    @Environment(\.colorScheme) private var colorScheme
+
+    let item: CustomItineraryItem
+    var onTap: () -> Void
+    var onDelete: () -> Void
+
+    // Drag handle visible - users can drag to reorder using .draggable/.dropDestination
+
+    var body: some View {
+        Button(action: onTap) {
+            HStack(spacing: 12) {
+                // Drag handle
+                Image(systemName: "line.3.horizontal")
+                    .foregroundStyle(.tertiary)
+                    .font(.caption)
+
+                // Category icon
+                Text(item.category.icon)
+                    .font(.title3)
+
+                // Title
+                Text(item.title)
+                    .font(.subheadline)
+                    .foregroundStyle(Theme.textPrimary(colorScheme))
+                    .lineLimit(2)
+
+                Spacer()
+
+                // Chevron to indicate tappable (tap to edit)
+                Image(systemName: "chevron.right")
+                    .foregroundStyle(.tertiary)
+                    .font(.caption)
+            }
+            .padding(.horizontal, Theme.Spacing.md)
+            .padding(.vertical, Theme.Spacing.sm)
+            .background(Theme.warmOrange.opacity(0.08))
+            .cornerRadius(8)
+        }
+        .buttonStyle(.plain)
+        .contextMenu {
+            Button {
+                onTap()
+            } label: {
+                Label("Edit", systemImage: "pencil")
+            }
+            Button(role: .destructive) {
+                onDelete()
+            } label: {
+                Label("Delete", systemImage: "trash")
+            }
+        }
+    }
+}
+
+#Preview {
+    VStack {
+        CustomItemRow(
+            item: CustomItineraryItem(
+                tripId: UUID(),
+                category: .restaurant,
+                title: "Joe's BBQ - Best brisket in Texas!",
+                anchorDay: 1
+            ),
+            onTap: {},
+            onDelete: {}
+        )
+        CustomItemRow(
+            item: CustomItineraryItem(
+                tripId: UUID(),
+                category: .hotel,
+                title: "Hilton Downtown",
+                anchorDay: 1
+            ),
+            onTap: {},
+            onDelete: {}
+        )
+    }
+    .padding()
+}