Show combined price for round trip bookings in the list

Now that only the outbound leg gets a row, its Price column showed just
that leg's price, silently missing the return leg's half. It now sums both
legs (bcadd, 2dp) for a round trip, with a breakdown shown underneath;
unchanged for one-way bookings.

app-modules/booking/src/Filament/Resources/Bookings/Tables/BookingsTable.php

@@ -37,6 +37,7 @@ class BookingsTable
                 ->where('is_return_leg', false)
                 ->with([
                     'route.company', 'route.fromDestination', 'route.toDestination', 'timeSlot', 'vehicleOptions',
+                    'linkedBooking',
                 ]))
             ->defaultSort('created_at', 'desc')
             ->columns([
@@ -76,6 +77,17 @@ class BookingsTable
                         ->all())
                     ->listWithLineBreaks(),
                 TextColumn::make('price')
+                    ->label('Price')
+                    // Since the return leg no longer has its own row (it's
+                    // now hidden — see the query above), the price shown
+                    // here for a round trip needs to be both legs combined,
+                    // or it silently reads as just the outbound half.
+                    ->state(fn (Booking $record) => $record->is_round_trip
+                        ? bcadd((string) $record->price, (string) ($record->linkedBooking?->price ?? '0'), 2)
+                        : $record->price)
+                    ->description(fn (Booking $record) => $record->is_round_trip
+                        ? number_format((float) $record->price, 2).' + '.number_format((float) ($record->linkedBooking?->price ?? 0), 2)
+                        : null)
                     ->numeric(2)
                     ->sortable(),
                 TextColumn::make('passenger_name')