fix(42-02): add easeCurve to dimension records and validation defaults

- Add easeCurve (340x480) to WorkflowCanvas keyboard shortcut dimensions
- Add easeCurve (340x480) to quickstart validation DEFAULT_DIMENSIONS
- Add easeCurve case to createDefaultNodeData switch (fixes exhaustive return)
- Required for NodeType union exhaustiveness after adding easeCurve type

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/WorkflowCanvas.tsx

@@ -982,6 +982,7 @@ export function WorkflowCanvas() {
             outputGallery: { width: 320, height: 360 },
             imageCompare: { width: 400, height: 360 },
             videoStitch: { width: 400, height: 280 },
+            easeCurve: { width: 340, height: 480 },
           };
           const dims = defaultDimensions[nodeType];
           addNode(nodeType, { x: centerX - dims.width / 2, y: centerY - dims.height / 2 });

src/lib/quickstart/validation.ts

@@ -39,6 +39,7 @@ const DEFAULT_DIMENSIONS: Record<NodeType, { width: number; height: number }> =
   outputGallery: { width: 320, height: 360 },
   imageCompare: { width: 400, height: 360 },
   videoStitch: { width: 400, height: 280 },
+  easeCurve: { width: 340, height: 480 },
 };
 
 /**
@@ -301,6 +302,17 @@ function createDefaultNodeData(type: NodeType): WorkflowNodeData {
         progress: 0,
         encoderSupported: null,
       };
+    case "easeCurve":
+      return {
+        bezierHandles: [0.445, 0.05, 0.55, 0.95] as [number, number, number, number],
+        easingPreset: "easeInOutSine",
+        outputDuration: 1.5,
+        outputVideo: null,
+        status: "idle",
+        error: null,
+        progress: 0,
+        encoderSupported: null,
+      };
   }
 }