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/state.ts

@@ -153,9 +153,8 @@ export class EditorState {
   }
 
   /**
-   * Runs one history operation. A `CommandError` is the documented way for a command to
-   * reject an edit, so it becomes a notice; anything else is a real defect and keeps
-   * travelling. Undo and redo go through here too – they can reject just like `execute`.
+   * Runs one history operation. A `CommandError` is a command rejecting the edit, so it becomes
+   * a notice; anything else is a real defect and keeps travelling.
    */
   private runEdit(operation: () => boolean): boolean {
     try {
@@ -196,7 +195,6 @@ export class EditorState {
 
   select(selection: Selection): void {
     // Test hooks pass the short form `{ kind: 'object', sceneId, objectId }` without `objectIds`.
-    // The type says `objectIds` is always there – untyped callers are exactly why this guard exists.
     // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
     if (selection?.kind === 'object' && !selection.objectIds)
       selection = objectSelection(selection.sceneId, [selection.objectId]);
@@ -260,8 +258,6 @@ export class EditorState {
     const s = this.selection;
     if (!s) return null;
     if (s.kind === 'node') return s.assetId;
-    // A frame names a texture and can never lead to a behavior. Answered here rather than
-    // fallen through, so what remains below is the asset/object pair the lookup assumes.
     if (s.kind === 'frame') return null;
     const scene = s.kind === 'object' ? findScene(this.project, s.sceneId) : undefined;
     const assetId = s.kind === 'asset' ? s.assetId : scene && findObject(scene, s.objectId)?.assetId;