fix: show booked room count in edit summary

tests/Service/RoomPricingCalculatorTest.php

@@ -300,6 +300,51 @@ class RoomPricingCalculatorTest extends TestCase
         $this->assertEquals(2, $result[0]['participantCount']);
         $this->assertEquals(210.0, $result[0]['unitPrice']);
         $this->assertEquals(420.0, $result[0]['totalPrice']);
+        $this->assertEquals(1, $result[0]['quantity']);
+    }
+
+    public function testCalculateRoomPricingInEditModeShowsBookedRoomCountNotOccupants(): void
+    {
+        // Booking 104407: 16 participants in one 6-bed room, one 4-bed room and three doubles.
+        $bookingDto = new BookingDto(new Travel(), 16);
+        $bookingDto->participants = [];
+        foreach ([0, 1, 2, 3, 4, 5] as $index) {
+            $bookingDto->participants[$index] = $this->participantInRoom(863);
+        }
+        foreach ([6, 7, 8, 9] as $index) {
+            $bookingDto->participants[$index] = $this->participantInRoom(95);
+        }
+        foreach ([10, 11, 12, 13, 14, 15] as $index) {
+            $bookingDto->participants[$index] = $this->participantInRoom(3);
+        }
+
+        $booking = new Booking();
+        $booking->rooms = [
+            863 => $this->bookedRoom(863, 6, 1, [0, 1, 2, 3, 4, 5], 194.0),
+            95 => $this->bookedRoom(95, 4, 1, [6, 7, 8, 9], 204.0),
+            3 => $this->bookedRoom(3, 2, 3, [10, 11, 12, 13, 14, 15], 224.0),
+        ];
+        $bookingDto->booking = $booking;
+
+        $result = $this->calculator->calculateRoomPricing($bookingDto);
+        $quantities = array_column($result, 'quantity', 'roomId');
+
+        $this->assertSame([863 => 1, 95 => 1, 3 => 3], $quantities);
+        $this->assertEquals(1344.0, $result[2]['totalPrice']);
+    }
+
+    /** @param int[] $mapping */
+    private function bookedRoom(int $id, int $maxPax, int $totalCount, array $mapping, float $price): Room
+    {
+        $room = new Room();
+        $room->id = $id;
+        $room->label = 'Room '.$id;
+        $room->maxPax = $maxPax;
+        $room->totalCount = $totalCount;
+        $room->mapping = $mapping;
+        $room->individualPrice = array_fill_keys($mapping, $price);
+
+        return $room;
     }
 
     private function participantInRoom(int $roomId): ParticipantDto