feat: add client-side polling support to generateVideoExecutor

After the initial /api/generate response, check for polling flag and
enter pollGenerateTask loop instead of waiting on a single long request.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/store/execution/generateVideoExecutor.ts

@@ -7,6 +7,7 @@
 
 import type { GenerateVideoNodeData } from "@/types";
 import { buildGenerateHeaders } from "@/store/utils/buildApiHeaders";
+import { pollGenerateTask } from "./pollTaskCompletion";
 import type { NodeExecutionContext } from "./types";
 
 export interface GenerateVideoOptions {
@@ -123,7 +124,28 @@ export async function executeGenerateVideo(
       throw new Error(errorMessage);
     }
 
-    const result = await response.json();
+    let result = await response.json();
+
+    // Handle polling response (long-running Kie tasks)
+    if (result.polling) {
+      result = await pollGenerateTask({
+        taskId: result.taskId,
+        provider: result.pollProvider,
+        modelId: result.pollModelId,
+        modelName: result.pollModelName,
+        mediaType: result.pollMediaType,
+        headers,
+        signal,
+      });
+
+      if (!result.success) {
+        updateNodeData(node.id, {
+          status: "error",
+          error: result.error || "Generation failed",
+        });
+        throw new Error(result.error || "Generation failed");
+      }
+    }
 
     // Handle video response (video or videoUrl field)
     const videoData = result.video || result.videoUrl;