fix: set Veo inputSchema synchronously in model selection handlers

Instead of setting inputSchema via useEffect (which runs after render),
set it directly in handleModelChange and handleBrowseModelSelect. This
ensures dynamic handles (including image-0 for I2V models) are rendered
in the same update cycle as model selection, preventing connection issues
where the image handle wouldn't accept connections.

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

src/components/nodes/GenerateVideoNode.tsx

@@ -29,6 +29,20 @@ function isVeoModel(modelId: string | undefined): boolean {
   return modelId.startsWith("veo-");
 }
 
+/** Build the hardcoded inputSchema for a Veo model, or undefined for non-Veo */
+function buildVeoInputSchema(modelId: string): ModelInputDef[] | undefined {
+  if (!isVeoModel(modelId)) return undefined;
+  const isI2V = modelId.includes("image-to-video");
+  const inputs: ModelInputDef[] = [
+    { name: "prompt", type: "text", required: true, label: "Prompt" },
+    { name: "negative_prompt", type: "text", required: false, label: "Neg. Prompt" },
+  ];
+  if (isI2V) {
+    inputs.unshift({ name: "image", type: "image", required: true, label: "Image" });
+  }
+  return inputs;
+}
+
 type GenerateVideoNodeType = Node<GenerateVideoNodeData, "generateVideo">;
 
 export function GenerateVideoNode({ id, data, selected }: NodeProps<GenerateVideoNodeType>) {
@@ -114,21 +128,6 @@ export function GenerateVideoNode({ id, data, selected }: NodeProps<GenerateVide
     fetchModels();
   }, [fetchModels]);
 
-  // Set inputSchema for Veo models (hardcoded, not fetched via ModelParameters)
-  const selectedModelId = nodeData.selectedModel?.modelId;
-  useEffect(() => {
-    if (!isVeoModel(selectedModelId)) return;
-    const isI2V = selectedModelId!.includes("image-to-video");
-    const inputs: ModelInputDef[] = [
-      { name: "prompt", type: "text", required: true, label: "Prompt" },
-      { name: "negative_prompt", type: "text", required: false, label: "Neg. Prompt" },
-    ];
-    if (isI2V) {
-      inputs.unshift({ name: "image", type: "image", required: true, label: "Image" });
-    }
-    updateNodeData(id, { inputSchema: inputs });
-  }, [id, selectedModelId, updateNodeData]);
-
   // Handle provider change
   const handleProviderChange = useCallback(
     (e: React.ChangeEvent<HTMLSelectElement>) => {
@@ -139,8 +138,8 @@ export function GenerateVideoNode({ id, data, selected }: NodeProps<GenerateVide
         modelId: "",
         displayName: "Select model...",
       };
-      // Clear parameters when switching providers (different providers have different schemas)
-      updateNodeData(id, { selectedModel: newSelectedModel, parameters: {} });
+      // Clear parameters and schema when switching providers
+      updateNodeData(id, { selectedModel: newSelectedModel, parameters: {}, inputSchema: undefined });
     },
     [id, updateNodeData]
   );
@@ -157,7 +156,12 @@ export function GenerateVideoNode({ id, data, selected }: NodeProps<GenerateVide
           displayName: model.name,
         };
         // Clear parameters when changing models (different models have different schemas)
-        updateNodeData(id, { selectedModel: newSelectedModel, parameters: {} });
+        // Set inputSchema immediately for Veo models so handles render in the same update
+        updateNodeData(id, {
+          selectedModel: newSelectedModel,
+          parameters: {},
+          inputSchema: buildVeoInputSchema(model.id),
+        });
       }
     },
     [id, currentProvider, externalModels, updateNodeData]
@@ -303,7 +307,12 @@ export function GenerateVideoNode({ id, data, selected }: NodeProps<GenerateVide
       modelId: model.id,
       displayName: model.name,
     };
-    updateNodeData(id, { selectedModel: newSelectedModel, parameters: {} });
+    // Set inputSchema immediately for Veo models so handles render in the same update
+    updateNodeData(id, {
+      selectedModel: newSelectedModel,
+      parameters: {},
+      inputSchema: buildVeoInputSchema(model.id),
+    });
     setIsBrowseDialogOpen(false);
   }, [id, updateNodeData]);