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/commands/containerCommands.ts

@@ -18,13 +18,10 @@ import { nextAssetName } from './naming';
 import { requireObject, requireScene } from './require';
 
 /**
- * Turns the selected objects (with everything parented below them) into a new container
- * asset and replaces them in the scene by one placed container – exactly as if that asset
- * had been placed there. The container's origin is the centre of the selection's bounding
- * box (x/y of the objects' world positions; z = 0), so the template is centred around
- * (0, 0, 0). The objects keep their ids and world positions: the selected roots are simply
- * re-parented under the container with recomputed local positions. When all roots share a
- * parent the container is placed below that parent, otherwise at the top level.
+ * Turns the selected objects, with everything parented below them, into a container asset placed
+ * in their stead. The origin is the centre of the selection's bounding box (z = 0), so the template
+ * is centred around (0, 0, 0); the objects keep their ids and world positions. The container goes
+ * below the roots' shared parent, or at the top level when they do not share one.
  */
 export class CreateContainerCommand implements Command {
   readonly label = 'Create container';
@@ -42,7 +39,6 @@ export class CreateContainerCommand implements Command {
     const selected = [...new Set(this.objectIds)].map((id) => requireObject(project, this.sceneId, id));
     if (selected.length === 0) throw new CommandError('Select at least one object to create a container');
 
-    // Centre of the selection in world space – the container's origin.
     const worlds = selected.map((o) => worldPosition(scene, o));
     const centre: Position = {
       x: Math.round((Math.min(...worlds.map((p) => p.x)) + Math.max(...worlds.map((p) => p.x))) / 2),
@@ -50,7 +46,7 @@ export class CreateContainerCommand implements Command {
       z: 0,
     };
 
-    // The subtrees that move into the container, in tree order (parents first).
+    // Members are collected in tree order, so a parent is always built before its children.
     const roots = new Set(
       subtreeRoots(
         scene,
@@ -64,7 +60,6 @@ export class CreateContainerCommand implements Command {
     const rootParents = new Set([...roots].map((id) => findObject(scene, id)!.parentId));
     const containerParentId = rootParents.size === 1 ? [...rootParents][0]! : '';
 
-    // Template: same structure with private ids, roots relative to the centre.
     const asset = buildAsset(
       'container',
       nextAssetName(project, 'Container'),
@@ -89,7 +84,6 @@ export class CreateContainerCommand implements Command {
       });
     }
 
-    // Scene: the container takes the roots' place, the members become its instance.
     this.previous = members.map((o) => ({
       id: o.id,
       parentId: o.parentId,