feat: warn about overlapping bookings instead of refusing them

tests/Service/BookingManagerTest.php

@@ -10,7 +10,6 @@ use App\Entity\Resource;
 use App\Entity\User;
 use App\Enum\RecurrenceRule;
 use App\Enum\ResourceType;
-use App\Exception\AlreadyHoldingResourceException;
 use App\Exception\ResourceAlreadyBookedException;
 use App\Model\TimeRange;
 use App\Service\BookingManager;
@@ -69,13 +68,19 @@ class BookingManagerTest extends KernelTestCase
         self::assertNotNull($second->getId());
     }
 
-    public function testOnePersonMayNotHoldTwoDesksAtOnce(): void
+    /**
+     * This was a refusal once. It is allowed now -- the second desk is usually for the customer
+     * somebody is meeting -- and the overlap is reported as a flash instead, which
+     * BookingControllerTest covers.
+     */
+    public function testOnePersonMayHoldTwoDesksAtOnce(): void
     {
         $user = $this->user('[email protected]');
         $this->manager->book($user, $this->resource('D1'), $this->date(), TimeRange::fromMinutes(540, 780));
 
-        $this->expectException(AlreadyHoldingResourceException::class);
-        $this->manager->book($user, $this->resource('D2'), $this->date(), TimeRange::fromMinutes(600, 720));
+        $second = $this->manager->book($user, $this->resource('D2'), $this->date(), TimeRange::fromMinutes(600, 720));
+
+        self::assertNotNull($second->getId());
     }
 
     public function testOnePersonMayHoldTwoDesksAtDifferentTimes(): void