merge: fix inspector not updating on device/frame selection

startDrag set state.selection but never re-rendered. One render() call
after the assignment fixes it. Now selecting a device or frame
populates the inspector with name/dims/delete-button as designed.

web/static/main.js

@@ -617,6 +617,11 @@ function startDrag(e, kind, id) {
   if (state.tool) return; // a tool is armed; don't hijack
   e.stopPropagation();
   state.selection = { kind, id };
+  // Render immediately so the inspector reflects the new selection from
+  // pointerdown — independent of whether the drag-completion render at
+  // the end of onUp runs. (Previously, the inspector only updated if
+  // pointerup completed cleanly; any throw in onUp left it stale.)
+  render();
 
   const svg = /** @type {SVGSVGElement} */ ($("#canvas"));
   const start = svgPoint(e);