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/store/serialize.ts

@@ -1,4 +1,4 @@
-// The graph package index registers the built-in nodes; unknown node types are dropped below.
+// Importing the graph package index is what registers the built-in nodes.
 import { createEmptyGraph, type Graph, type GraphEdge, type GraphNode, nodeDef } from '../graph';
 import type { Asset, TextureFrame } from '../model/Asset';
 import { isAssetType } from '../model/AssetTypes';
@@ -20,16 +20,14 @@ import {
 } from '../properties/PropertySchema';
 
 /**
- * Turns untrusted JSON (server file, import) into a well-formed Project. Unknown keys are
- * dropped, missing ones get defaults, values are coerced against the schema, dangling
- * scene objects are removed. Future format migrations live here as well.
+ * Turns untrusted JSON (server file, import) into a well-formed Project: unknown keys are dropped,
+ * missing ones get defaults, values are coerced against the schema, dangling objects are removed.
  */
 export function deserializeProject(raw: unknown, fallbackId = ''): Project {
   const r = asRecord(raw);
   const rawAssets = (Array.isArray(r.assets) ? r.assets : []).map(asRecord);
 
-  // Pass 1: asset ids and their effective schemas (behaviors declare their own variables),
-  // needed to coerce scene-object overrides in pass 2.
+  // Pass 1: asset ids and their effective schemas, needed to coerce overrides in pass 2.
   const schemas = new Map<string, PropertySchema>();
   const variables = new Map<string, PropertyDef[]>();
   for (const a of rawAssets) {
@@ -43,8 +41,8 @@ export function deserializeProject(raw: unknown, fallbackId = ''): Project {
     }
   }
 
-  // Pass 2: build assets. Frame ids live in the same reference space as asset ids (a sprite's
-  // `texture` may name either), so they are handed the ids already spoken for.
+  // Pass 2: build assets. Frame ids share the reference space with asset ids, so `normalizeTexture`
+  // is handed the ids already spoken for.
   const assets: Asset[] = [];
   const takenIds = new Set(schemas.keys());
   for (const a of rawAssets) {
@@ -106,10 +104,9 @@ function normalizeObjects(raw: unknown, schemas: Map<string, PropertySchema>): S
       assetId: o.assetId,
       name: typeof o.name === 'string' ? o.name : '',
       position: { x: toNumber(p.x), y: toNumber(p.y), z: toNumber(p.z) },
-      // Editor-only view shift; absent in documents written before it existed.
       editorOffset: { x: toNumber(offset.x), y: toNumber(offset.y) },
       overrides: normalizeBag(o.overrides, schema, true),
-      // `ownerId` is the pre-hierarchy name of the same link (documents saved before parenting).
+      // `ownerId` is the pre-hierarchy name of the same link.
       parentId: typeof o.parentId === 'string' ? o.parentId : typeof o.ownerId === 'string' ? o.ownerId : '',
       templateId: typeof o.templateId === 'string' ? o.templateId : '',
     });
@@ -150,7 +147,7 @@ function normalizeGraph(raw: unknown): Graph {
     const n = asRecord(item);
     const id = typeof n.id === 'string' ? n.id : '';
     const type = typeof n.type === 'string' ? n.type : '';
-    if (!id || nodeIds.has(id) || !nodeDef(type)) continue; // unknown node types are dropped
+    if (!id || nodeIds.has(id) || !nodeDef(type)) continue;
     nodeIds.add(id);
     const params: PropertyBag = {};
     for (const [key, value] of Object.entries(asRecord(n.params))) {
@@ -187,9 +184,8 @@ function normalizeGraph(raw: unknown): Graph {
 }
 
 /**
- * The picture of a texture asset. A file name that is not the server's content-addressed form
- * is dropped rather than kept: it can only have been hand-written, and a request built from it
- * would 404. Such a texture loads as "no picture", which draws as the sprite's plain colour.
+ * A file name that is not the server's content-addressed form is dropped: a request built from it
+ * would 404, and the texture then loads as "no picture".
  */
 function normalizeTexture(
   raw: Record<string, unknown>,
@@ -204,8 +200,8 @@ function normalizeTexture(
   for (const item of Array.isArray(raw.frames) ? raw.frames : []) {
     const f = asRecord(item);
     const id = typeof f.id === 'string' ? f.id : '';
-    // A frame id shares the reference space with asset ids (a sprite may name either), so a
-    // duplicate would make one reference mean two pictures. Drop it rather than resolve it.
+    // Frame ids share the reference space with asset ids, so a duplicate would make one
+    // reference mean two pictures.
     if (!id || takenIds.has(id)) continue;
     takenIds.add(id);
     const rect = normalizeFrameRect(