fix: add missing conditionalSwitch dimensions in WorkflowCanvas

The inline defaultDimensions record in the keyboard shortcut handler was
missing the conditionalSwitch entry, causing a TypeScript build error.

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

src/components/WorkflowCanvas.tsx

@@ -1346,6 +1346,7 @@ export function WorkflowCanvas() {
             videoFrameGrab: { width: 320, height: 320 },
             router: { width: 200, height: 80 },
             switch: { width: 220, height: 120 },
+            conditionalSwitch: { width: 260, height: 180 },
             glbViewer: { width: 360, height: 380 },
           };
           const dims = defaultDimensions[nodeType];