Trim needless comments and fix the picker width

Remove comments that only restate the code, keeping the section banners
and the notes that carry a reason, a measured fact or an external
contract.

ButtonOptions.width claimed to be a fixed width but only set minWidth,
so the Graph and Texture pickers grew with the name they showed. It is
now what it promises, with a separate minWidth for the buttons that have
two forms. Narrow buttons shrink their padding, otherwise a 24px icon
button had 8px left for its glyph and truncate dropped it entirely.

__gm.labelsDropped() guards that class: the overflow guard only saw text
that was too wide, never a label truncated to nothing.

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

src/editor/inspector/host.ts

@@ -2,11 +2,7 @@ import { Label, type TextField, type VStack } from '../../ui';
 import type { EditorState } from '../state';
 import type { FieldContext, FieldRow } from './fieldFactory';
 
-/**
- * What the inspector sections build into: the panel body and the registry of rows. It is also
- * the FieldContext the sections hand to the field factory, so a row can resolve an asset
- * reference without the factory knowing anything about the editor state.
- */
+/** What the inspector sections build into: the panel body and the registry of rows. */
 export interface InspectorHost extends FieldContext {
   readonly state: EditorState;
   readonly body: VStack;