Fix findUsages/undo/node-lookup bugs, split Viewport and Editor, share command and inspector helpers

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

src/core/properties/PropertySchema.ts

@@ -16,8 +16,6 @@ export type PropertyDef =
   /** A keyboard key name (`KeyboardEvent.key`), captured by pressing it. */
   | { key: string; label: string; kind: 'key'; default: string };
 
-export type PropertyKind = PropertyDef['kind'];
-
 export type PropertySchema = readonly PropertyDef[];
 
 /** Kinds a behavior variable may have (what the node graph can compute with). */
@@ -40,7 +38,7 @@ export function isCommonProp(key: string): boolean {
 }
 
 /** Property schema per asset type. Position is deliberately absent: it belongs to scene objects. */
-export const ASSET_SCHEMAS: Record<AssetType, PropertySchema> = {
+const ASSET_SCHEMAS: Record<AssetType, PropertySchema> = {
   scene: [{ key: 'backgroundColor', label: 'Background', kind: 'color', default: 0x2a2d34 }],
   camera: [
     { key: 'width', label: 'View width', kind: 'number', default: 640, min: 16, step: 1 },

src/core/properties/enabled.ts

@@ -5,6 +5,7 @@
  * what makes a container usable as a screen: switch it on to show it, off to hide it.
  */
 import type { PropertyBag } from '../model/Properties';
+import { parentChain } from '../model/walk';
 
 /** A missing value counts as on. */
 function propsEnabled(props: PropertyBag): boolean {
@@ -16,10 +17,6 @@ function propsEnabled(props: PropertyBag): boolean {
  * model (scene objects), the viewport (draw items) and the runtime (entities) share one rule.
  */
 export function enabledAlongChain<T>(start: T, propsOf: (item: T) => PropertyBag, parentOf: (item: T) => T | null): boolean {
-  const seen = new Set<T>();
-  for (let current: T | null = start; current && !seen.has(current); current = parentOf(current)) {
-    if (!propsEnabled(propsOf(current))) return false;
-    seen.add(current);
-  }
+  for (const item of parentChain(start, parentOf)) if (!propsEnabled(propsOf(item))) return false;
   return true;
 }