fix: add missing conditionalSwitch to WorkflowCanvas defaultDimensions

Pre-existing type error — conditionalSwitch was added to NodeType but the
local defaultDimensions map in keyboard shortcut handler was not updated.

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

src/components/WorkflowCanvas.tsx

@@ -1152,6 +1152,9 @@ export function WorkflowCanvas() {
             easeCurve: { width: 340, height: 480 },
             videoTrim: { width: 360, height: 360 },
             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];