docs(breakpoints): drop the comment (768/1280 are recognizable Tailwind md/xl)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/hooks/use-breakpoint.ts

@@ -6,8 +6,6 @@ export enum BreakpointName {
     tablet = 'tablet',
 }
 
-// px thresholds mirror Tailwind's `md` (768) and `xl` (1280) so JS layout switches line up with CSS `md:`/`xl:`
-// variants — keep them equal (a component may pick either for the same responsive decision, e.g. the editor split).
 export const breakpoints = {
     [BreakpointName.desktop]: Infinity,
     [BreakpointName.mobile]: 768,