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/camera.ts

@@ -12,8 +12,8 @@ export interface WorldRect {
 }
 
 /**
- * Size of the world region a camera shows, in world units: its view size divided by its
- * zoom. This is the frame drawn in edit mode and the only region rendered in play mode.
+ * The world region a camera shows: its view size divided by its zoom. Drawn as a frame in edit mode,
+ * and the only region rendered in play mode.
  */
 export function cameraFrame(props: PropertyBag): { w: number; h: number } {
   const zoom = Math.max(0.01, Number(props.zoom ?? DEFAULTS.zoom));