Drop the collider and delete-node buttons from the inspector

Adding a collider now lives only in the Scene objects context menu, deleting a node on
the Delete key and the node context menu. The e2e checks that pinned the inspector button
now drive the hierarchy menu instead, including that its entry is disabled on template
content and on a placed container without raising a notice.

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

src/editor/inspector/nodeSection.ts

@@ -1,4 +1,3 @@
-import { RemoveNodeCommand } from '../../core/commands/graphCommands';
 import {
   callProblem,
   declaresVariablePorts,
@@ -13,9 +12,9 @@ import type { Asset } from '../../core/model/Asset';
 import { behaviorLookup } from '../../core/model/behaviorPrograms';
 import { findAssetOf, type Project } from '../../core/model/Project';
 import type { PropertyDef } from '../../core/properties/PropertySchema';
-import { Button, Label } from '../../ui';
+import { Label } from '../../ui';
 import { createFieldRow, type FieldHandlers } from './fieldFactory';
-import { addGap, addNote, addTitle, type InspectorHost } from './host';
+import { addNote, addTitle, type InspectorHost } from './host';
 import { buildPortSection, buildVariablePortSection } from './portSection';
 import { listOpener, previewingHandlers } from './previewHandlers';
 import { currentNode, nodeParamValue } from './valueSpecs';
@@ -81,14 +80,6 @@ export function buildNodeSection(host: InspectorHost, assetId: string, nodeId: s
     host.fields.set(`input:${port.key}`, row);
     host.body.add(row.row);
   }
-
-  addGap(host);
-  host.body.add(
-    new Button('Delete node', {
-      variant: 'danger',
-      onClick: () => host.state.execute(new RemoveNodeCommand(assetId, nodeId)),
-    }),
-  );
 }
 
 /** Pushes the node's current params into the rows. False when the node is gone (rebuild). */