fix: use concrete anonymous class instead of Mockery for AttendanceMailerService binding in setUp

Mockery's lifecycle (created in setUp, closed in tearDown) may
interfere with the container binding across tests. Using a plain
anonymous class avoids this issue entirely.

tests/Feature/Api/V1/AttendanceTracking/AttendanceTrackingControllerTest.php

@@ -20,12 +20,19 @@ class AttendanceTrackingControllerTest extends TestCase
     {
         parent::setUp();
 
-        // Bind the AttendanceMailerService interface to a mock so the
+        // Bind the AttendanceMailerService interface to a no-op implementation
-        // controller can be instantiated during route middleware gathering
+        // so the controller can be instantiated during route middleware gathering
         // even when the full service chain is not mocked.
         $this->app->instance(
             AttendanceMailerService::class,
-            Mockery::mock(AttendanceMailerService::class)
+            new class implements AttendanceMailerService {
+                public function send(string $to, string $subject, string $html): bool
+                {
+                    return true;
+                }
+
+                public function queueAttendanceEvent(array $payload): void {}
+            }
         );
     }