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/store/ProjectStore.ts

@@ -20,11 +20,10 @@ export class StaleRevisionError extends Error {
   }
 }
 
-/** Persistence boundary. The editor only talks to this interface. */
 export interface ProjectStore {
   list(): Promise<ProjectSummary[]>;
   load(id: string): Promise<LoadedProject>;
-  /** Saves the project and returns the new revision. Rejects with StaleRevisionError on conflict. */
+  /** Returns the new revision; rejects with `StaleRevisionError` on conflict. */
   save(project: Project, revision: number): Promise<number>;
   create(name: string): Promise<LoadedProject>;
   delete(id: string): Promise<void>;