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/PlaySession.ts

@@ -1,10 +1,7 @@
 /**
  * Owns everything that only exists while the project is playing: the world, its systems, the
- * keyboard and the per-frame step.
- *
- * The key rule lives here: play never touches the saved model. `state.enterPlay()` swaps in a
- * runtime copy, the world is built from that copy, edits made while playing go into it, and
- * `exitPlay()` throws it away again.
+ * keyboard and the per-frame step. Play never touches the saved model – the world is built
+ * from the runtime copy `state.enterPlay()` swaps in and `exitPlay()` throws away.
  */
 import { worldPositionOf } from '../core/graph';
 import { BehaviorSystem, type Trace } from '../runtime/systems/BehaviorSystem';
@@ -32,13 +29,11 @@ export interface WorldSnapshot {
   log: string[];
 }
 
-/** What a play session needs from the surrounding editor, and nothing more. */
 export interface PlayHost {
   gameView: GameViewport;
   graphEditor: GraphEditor;
-  /** Bring the game view to the front – play has started. */
   showGame(): void;
-  /** Leave the game view if it is the one on screen – play has stopped. */
+  /** Leave the game view if it is the one on screen. */
   leaveGame(): void;
 }
 
@@ -56,7 +51,6 @@ export class PlaySession {
     return this.world !== null;
   }
 
-  /** Live execution data for the graph editor (null when not playing). */
   traceFor(assetId: string): Trace | null {
     return this.behaviors?.traceFor(assetId) ?? null;
   }
@@ -65,15 +59,10 @@ export class PlaySession {
     return this.world?.time ?? 0;
   }
 
-  /** Mirrors an edit made while playing into the running world at once. */
   syncFromModel(): void {
     this.world?.syncFromModel();
   }
 
-  /**
-   * Starts a run: the state switches to a runtime copy, the world is built from it and shown
-   * in the Game tab. All panels stay open and edit the copy.
-   */
   play(): void {
     const scene = this.state.activeScene;
     if (!scene) return;
@@ -97,7 +86,6 @@ export class PlaySession {
     if (world.stopRequested) this.stop();
   }
 
-  /** Ends the run: the world and the runtime copy are discarded, the saved model returns untouched. */
   stop(): void {
     const world = this.world;
     this.world = null;
@@ -112,7 +100,6 @@ export class PlaySession {
     this.state.setNotice(lastError ?? '');
   }
 
-  /** One frame. Does nothing when not playing. */
   tick(dt: number): void {
     const world = this.world;
     if (!world) return;
@@ -122,20 +109,17 @@ export class PlaySession {
       this.stop();
       return;
     }
-    // Restart game: throw the run away and start the scene again from the saved model.
     if (world.restartRequested) {
       this.stop();
       this.play();
       return;
     }
     // Mirror what the systems did into the runtime copy so the panels show live values.
-    // A destroyed entity removes its object – that is a structural change the lists must see.
     if (world.syncToModel()) this.state.preview();
     this.state.runtimeTick();
     if (this.host.graphEditor.visible) this.host.graphEditor.canvas.redraw();
   }
 
-  /** Read-only view of the running world for the check scripts. */
   snapshot(): WorldSnapshot | null {
     const world = this.world;
     if (!world) return null;