fix: clear loading state and adjust job timeout duration in image generation process

Author: yaroslav8765

custom/ImageGenerationCarousel.vue

@@ -309,6 +309,9 @@ async function generateImages() {
         variant: 'danger',
         timeout: 'unlimited',
       });
+    clearInterval(ticker);
+    loadingTimer.value = null;
+    loading.value = false;
     return;
   }
 

index.ts

@@ -658,7 +658,7 @@ export default class  BulkAiFlowPlugin extends AdminForthPlugin {
           } 
         }
         setTimeout(() => jobs.delete(jobId), 1_800_000);
-        setTimeout(() => jobs.set(jobId, { status: "failed", error: "Job timed out" }), 300_000);
+        setTimeout(() => jobs.set(jobId, { status: "failed", error: "Job timed out" }), 180_000);
         return { ok: true, jobId };
       }
     });