Detail sheet: lead with depart → arrival, push LIVE STATE below

When you tap an aircraft you almost always want to know where it
came from and where it's going. Moving routeSection above the
divider so it's the first block under the callsign header — no
scrolling to find it.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Flights/Views/LiveFlightDetailSheet.swift

@@ -33,9 +33,13 @@ struct LiveFlightDetailSheet: View {
                 VStack(alignment: .leading, spacing: 16) {
                     header
 
+                    // Depart → Arrival lives directly under the callsign
+                    // header — it's the single most important thing the
+                    // user opened the sheet to see.
+                    routeSection
+
                     Divider()
 
-                    // Live state grid
                     Text("LIVE STATE")
                         .font(FlightTheme.label())
                         .foregroundStyle(FlightTheme.textTertiary)
@@ -43,9 +47,6 @@ struct LiveFlightDetailSheet: View {
 
                     liveStateGrid
 
-                    routeSection
-                        .padding(.top, 4)
-
                     if recentFlights.count > 1 {
                         Text("RECENT FLIGHTS")
                             .font(FlightTheme.label())