Add test for cp_thumbnail filter with CP disabled

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jasonvarga

tests/Console/Commands/AssetsGeneratePresetsTest.php

@@ -72,6 +72,19 @@ public function it_only_generates_cp_thumbnail_presets_when_cp_thumbnail_filter_
         Bus::assertNotDispatchedSync(GeneratePresetImageManipulation::class, fn ($job) => $job->preset === 'preset_two');
     }
 
+    #[Test]
+    public function it_generates_nothing_when_cp_thumbnail_filter_is_used_but_cp_is_disabled()
+    {
+        config(['statamic.cp.enabled' => false]);
+
+        $this->makeContainer();
+        $this->putLandscapeImage();
+
+        $this->artisan('statamic:assets:generate-presets --preset=cp_thumbnail');
+
+        Bus::assertNotDispatchedSync(GeneratePresetImageManipulation::class);
+    }
+
     #[Test]
     public function it_generates_only_the_specified_preset()
     {