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/core/properties/assetRef.ts

@@ -2,16 +2,11 @@ import type { Asset } from '../model/Asset';
 import { type AssetType, isPlaceableType } from '../model/AssetTypes';
 import { findAsset, type Project } from '../model/Project';
 
-/** Shown for an `asset` property that references nothing. */
 export const NO_ASSET_LABEL = 'None';
 
 /**
- * How an `asset` reference reads wherever it is displayed: the referenced asset's name, "None"
- * for the empty id, and `<id>?` when the id no longer resolves.
- *
- * A dangling reference keeps showing its id instead of falling back to "None": the id is the
- * only trace left of what was meant, and blanking it would make a deleted asset look like a
- * field that was never filled in. `project` may be null while a view has no project yet.
+ * The asset's name, "None" for the empty id, `<id>?` when it no longer resolves – a dangling
+ * reference shows its id rather than passing for an empty field.
  */
 export function assetRefLabel(project: Project | null, id: string): string {
   if (id === '') return NO_ASSET_LABEL;
@@ -19,10 +14,8 @@ export function assetRefLabel(project: Project | null, id: string): string {
 }
 
 /**
- * The assets an `asset` property offers, in menu order. `assetTypes` restricts them to those
- * types; without it every *placeable* asset is offered, which is what a graph node acting on
- * an object means by "asset". Sorted by name (then type) so the order does not depend on when
- * the assets happened to be created.
+ * The assets an `asset` property offers, in menu order; without `assetTypes` every placeable one.
+ * Sorted by name so the order does not depend on creation time.
  */
 export function assetRefChoices(project: Project, assetTypes?: readonly AssetType[]): Asset[] {
   const allowed = (asset: Asset): boolean =>
@@ -32,7 +25,6 @@ export function assetRefChoices(project: Project, assetTypes?: readonly AssetTyp
     .sort((a, b) => a.name.localeCompare(b.name) || a.type.localeCompare(b.type));
 }
 
-/** Menu entry for one candidate – the type disambiguates assets that share a name. */
 export function assetChoiceLabel(asset: Asset): string {
   return `${asset.name} (${asset.type})`;
 }