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/editor/panels/AssetPanel.ts

@@ -1,10 +1,11 @@
-import { CreateAssetCommand, DeleteAssetCommand, SetActiveSceneCommand } from '../../core/commands/assetCommands';
+import { CreateAssetCommand, SetActiveSceneCommand } from '../../core/commands/assetCommands';
 import { nextAssetName } from '../../core/commands/naming';
 import { PlaceAssetCommand } from '../../core/commands/sceneObjectCommands';
 import { ASSET_TYPE_LABELS, ASSET_TYPES, type AssetType, hasColorSwatch } from '../../core/model/AssetTypes';
 import type { Vec2 } from '../../core/model/Properties';
-import { findAsset, findUsages } from '../../core/model/Project';
-import { Button, Dialog, ListView, Menu, type MenuItem, Panel, ScrollContainer } from '../../ui';
+import { findAsset } from '../../core/model/Project';
+import { Button, ListView, Menu, type MenuItem, Panel, ScrollContainer } from '../../ui';
+import { confirmDeleteAsset } from '../actions';
 import { type EditorState, objectSelection } from '../state';
 
 /** Lists all assets of the project; creates, places and deletes them. */
@@ -84,25 +85,7 @@ export class AssetPanel extends Panel {
     } else {
       items.push({ label: 'Place in scene', onSelect: () => this.place(id), disabled: !this.state.activeScene });
     }
-    items.push({ label: 'Delete…', danger: true, onSelect: () => this.confirmDelete(id) });
+    items.push({ label: 'Delete…', danger: true, onSelect: () => confirmDeleteAsset(this.state, id) });
     new Menu(items).open(x, y);
   }
-
-  private confirmDelete(id: string): void {
-    const asset = findAsset(this.state.project, id);
-    if (!asset) return;
-    const usages = findUsages(this.state.project, id).length;
-    const detail =
-      asset.type === 'scene'
-        ? `The scene and its ${asset.objects.length} object(s) are removed.`
-        : asset.type === 'container' && usages > 0
-          ? `${usages} placed container(s) are removed from scenes together with their content.`
-          : usages > 0
-            ? `${usages} placed instance(s) are removed from scenes as well.`
-            : 'This cannot be undone with Ctrl+Z after reload.';
-    new Dialog(`Delete "${asset.name}"?`, detail, [
-      { label: 'Cancel' },
-      { label: 'Delete', danger: true, onClick: () => this.state.execute(new DeleteAssetCommand(id)) },
-    ]).openCentered();
-  }
 }