Keep master merge tests aligned with current handles

The TEST-s line can fast-forward into master, but the verification gate exposed stale test assumptions: video nodes now expose both input and output Video labels, and WorkflowCanvas tests need the ReactFlow setNodes API used by image node resizing.

Constraint: Preserve runtime behavior while making the merge gate reliable
Rejected: Change production node labels | the UI behavior is intentional and already deployed on TEST-s
Confidence: high
Scope-risk: narrow
Tested: npm run test:run -- src/components/__tests__/GenerateVideoNode.test.tsx src/components/__tests__/WorkflowCanvas.test.tsx
Tested: npm run test:run
Tested: npm run build

src/components/__tests__/GenerateVideoNode.test.tsx

@@ -177,10 +177,10 @@ describe("GenerateVideoNode", () => {
         </TestWrapper>
       );
 
-      // Should have Image and Prompt labels for inputs, Video for output
+      // Should have Image and Prompt labels for inputs, plus Video labels for input and output.
       expect(screen.getByText("Image")).toBeInTheDocument();
       expect(screen.getByText("Prompt")).toBeInTheDocument();
-      expect(screen.getByText("Video")).toBeInTheDocument();
+      expect(screen.getAllByText("Video")).toHaveLength(2);
     });
   });
 

src/components/__tests__/WorkflowCanvas.test.tsx

@@ -39,6 +39,7 @@ const mockGetViewport = vi.fn(() => ({ x: 0, y: 0, zoom: 1 }));
 const mockZoomIn = vi.fn();
 const mockZoomOut = vi.fn();
 const mockSetViewport = vi.fn();
+const mockSetNodes = vi.fn();
 
 vi.mock("@xyflow/react", async () => {
   const actual = await vi.importActual("@xyflow/react");
@@ -50,6 +51,7 @@ vi.mock("@xyflow/react", async () => {
       zoomIn: mockZoomIn,
       zoomOut: mockZoomOut,
       setViewport: mockSetViewport,
+      setNodes: mockSetNodes,
     }),
   };
 });