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>

tests/core/texture.test.ts

@@ -18,7 +18,6 @@ import { makeSpriteScene, place, roundTrip } from '../helpers';
 const FILE = `${'a1b2c3d4'.repeat(8)}.png`;
 const OTHER_FILE = `${'0f'.repeat(32)}.webp`;
 
-/** Adds a texture asset carrying `file` and returns it. */
 function addTexture(fixture: ReturnType<typeof makeSpriteScene>, file = FILE, name = 'Bricks') {
   const command = new CreateTextureCommand(name, { file, width: 64, height: 48 });
   fixture.stack.execute(command);
@@ -51,7 +50,7 @@ describe('resolveTexture', () => {
     const sprite = findAsset(fixture.project, fixture.spriteId)!;
     sprite.props.texture = texture.id;
 
-    // A whole-texture reference carries no rectangle: the renderer then needs no matrix at all.
+    // A whole-texture reference carries no rectangle.
     const whole = { file: FILE, rect: null, sourceWidth: 64, sourceHeight: 48 };
     expect(resolveTexture(fixture.project, sprite.props)).toEqual({ ...whole, smooth: true });
     texture.props.filter = 'nearest';
@@ -64,8 +63,6 @@ describe('resolveTexture', () => {
     texture.frames.push({ id: 'f1', name: 'Idle', x: 16, y: 8, w: 32, h: 24 });
     const sprite = findAsset(fixture.project, fixture.spriteId)!;
 
-    // The same property holds either kind of id, which is what keeps sprites written before
-    // frames existed meaning exactly what they meant.
     sprite.props.texture = 'f1';
     expect(resolveTexture(fixture.project, sprite.props)).toEqual({
       file: FILE,
@@ -146,8 +143,7 @@ describe('findPropertyUsages', () => {
     sprite.props.texture = texture.id;
     const objectId = place(fixture, fixture.spriteId, { x: 0, y: 0 });
 
-    // A texture is never placed, so the "is it used?" question `findUsages` answers is blind
-    // to it – that is exactly the gap this function fills.
+    // A texture is never placed, so `findUsages` is blind to it – hence this function.
     expect(findUsages(fixture.project, texture.id)).toHaveLength(0);
 
     const usages = findPropertyUsages(fixture.project, texture.id);
@@ -165,8 +161,7 @@ describe('findPropertyUsages', () => {
     texture.frames.push({ id: 'f1', name: 'Idle', x: 0, y: 0, w: 8, h: 8 });
     findAsset(fixture.project, fixture.spriteId)!.props.texture = 'f1';
 
-    // Asking by the asset id alone under-reports exactly the sheets that were sliced – the
-    // ones with the most users – which is why deleting one asks about every id it owns.
+    // The asset id alone under-reports sliced sheets, so deleting one asks about every id it owns.
     expect(findPropertyUsages(fixture.project, texture.id)).toHaveLength(0);
     expect(findPropertyUsages(fixture.project, textureRefIds(texture))).toHaveLength(1);
   });