Title a collapsed Variables or Properties node by what it does

Collapsed, the node reads "Set 2 variables", "Get width" or "No properties";
expanded it is always "Variables" / "Properties". The Properties node shows
its object type (and behavior) as a line under the title instead.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/editor/graph/NodeView.ts

@@ -384,6 +384,7 @@ function formatField(def: PropertyDef, value: Value, project: Project | null): s
   if (def.kind === 'asset') return assetRefLabel(project, asString(value));
   if (def.kind === 'texture') return textureRefLabel(project, asString(value));
   if (def.kind === 'color') return toHex(asNumber(value));
+  if (def.kind === 'enum') return def.options.find((o) => o.value === value)?.label ?? formatValue(value);
   return formatValue(value);
 }