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/viewport/view.ts

@@ -1,14 +1,9 @@
-/**
- * How world coordinates map onto a viewport. Pure geometry – no Pixi, no editor state – so
- * both viewports share one definition of "where does this world point land on screen".
- */
 import type { PropertyBag, Vec2 } from '../core/model/Properties';
 import { cameraFrame, rectAround, type WorldRect } from '../core/properties/camera';
 
 /**
  * The world point (`x`, `y`) sits at the centre of the screen rectangle `rect` (viewport-local
- * pixels) at `scale` pixels per world unit. In the scene view the rectangle is the whole
- * viewport; in the game view it is the camera's frame fitted into it (letterboxed).
+ * pixels) at `scale` pixels per world unit.
  */
 export interface View {
   x: number;
@@ -17,15 +12,12 @@ export interface View {
   rect: { x: number; y: number; w: number; h: number };
 }
 
-/** Free-panning view: the whole viewport shows the world around (`x`, `y`) at `zoom`. */
+/** Free-panning view: the whole viewport is the rectangle. */
 export function freeView(x: number, y: number, zoom: number, w: number, h: number): View {
   return { x, y, scale: zoom, rect: { x: 0, y: 0, w, h } };
 }
 
-/**
- * The camera's frame scaled to fit inside `w`×`h` and centred – the remaining margin is the
- * letterbox, which is not part of the game area (see `isInside`).
- */
+/** The camera's frame fitted into `w`×`h` and centred; the remaining margin is letterbox. */
 export function cameraView(camera: { x: number; y: number; props: PropertyBag }, w: number, h: number): View {
   const frame = cameraFrame(camera.props);
   const scale = Math.min(w / frame.w, h / frame.h);
@@ -46,7 +38,6 @@ export function worldToScreen(view: View, wx: number, wy: number): Vec2 {
   return { x: (wx - view.x) * view.scale + cx, y: (wy - view.y) * view.scale + cy };
 }
 
-/** World region the view covers – what a redraw has to consider at all. */
 export function worldBounds(view: View): WorldRect {
   return rectAround(view.x, view.y, view.rect.w / view.scale, view.rect.h / view.scale);
 }