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/editor/Editor.ts

@@ -19,7 +19,6 @@ import { installTextureImport } from './textureImport';
 
 export type CentreTab = 'scene' | 'graph' | 'game' | 'texture';
 
-/** Tab strip order – also the one list `showTab` walks, so a new tab cannot be half-added. */
 const TAB_ORDER = ['scene', 'game', 'graph', 'texture'] as const;
 
 const MIN_LEFT_WIDTH = 160;
@@ -38,7 +37,6 @@ export class Editor implements PlayHost {
   /** Game tab: the running world through its camera. */
   readonly gameView: GameViewport;
   readonly graphEditor: GraphEditor;
-  /** Texture tab: one sheet with its frames. */
   readonly textureEditor: TextureEditor;
   readonly hierarchy: HierarchyPanel;
   tab: CentreTab = 'scene';
@@ -73,7 +71,6 @@ export class Editor implements PlayHost {
     this.hierarchy = new HierarchyPanel(state);
     this.inspector = new Inspector(state);
     this.play = new PlaySession(state, this);
-    // A run holds a copy of the project, so it has to end before a different one is loaded.
     this.projects = new ProjectSession(state, store, () => {
       if (this.play.isPlaying) this.play.stop();
     });
@@ -91,12 +88,9 @@ export class Editor implements PlayHost {
     this.workspace = new HStack();
     this.leftColumn = new VStack({ gap: 1 });
     this.leftColumn.add(new AssetPanel(state, () => this.viewport.worldCenter(), textures), 1);
-    // Dropping an image on the canvas or pasting one imports it, wherever the pointer is –
-    // the same import the asset panel's "Texture" entry runs.
     installTextureImport(app.canvas, { state, textures });
     this.leftColumn.add(this.hierarchy, 1);
 
-    // Centre: a tab strip above the scene view, the game view, the graph editor or the sheet editor.
     this.centre = new VStack();
     const tabs = new HStack({ gap: 2, padding: 4, align: 'center' });
     tabs.minHeight = Theme.controlHeight + 8;
@@ -144,15 +138,13 @@ export class Editor implements PlayHost {
     attachAutosave(state, store);
     installShortcuts(state, { play: () => this.play.play(), stop: () => this.play.stop() });
     app.ticker.add((ticker) => this.tick(ticker.deltaMS / 1000));
-    // Selecting a graph node switches to the graph, selecting a frame to the sheet: both are
-    // things that exist *only* in their tab, so a selection you could not see would be a lie.
-    // Selecting the behavior or the texture asset itself does not force anything.
+    // A node and a frame exist only in their own tab, so selecting one switches to it;
+    // selecting the behavior or texture asset itself does not.
     state.on('selection', () => {
       const kind = state.selection?.kind;
       if (kind === 'node' && this.tab !== 'graph') this.showTab('graph');
       if (kind === 'frame' && this.tab !== 'texture') this.showTab('texture');
     });
-    // While playing, every edit (command, undo, scrub preview) is mirrored into the world at once.
     state.on('project', () => this.play.syncFromModel());
   }
 
@@ -167,7 +159,6 @@ export class Editor implements PlayHost {
     ui().focus.validate();
   }
 
-  /** Opens the project named in the URL, else the first one on the server, else a new one. */
   boot(): Promise<void> {
     return this.projects.boot();
   }
@@ -189,7 +180,7 @@ export class Editor implements PlayHost {
     this.play.tick(dt);
   }
 
-  /** Counts rendered frames (edit and play alike) and refreshes the toolbar readout twice a second. */
+  /** Refreshes the toolbar readout twice a second. */
   private measureFps(dt: number): void {
     this.fpsFrames += 1;
     this.fpsElapsed += dt;