chore(desktop): narrow PR to feature scope

Revert out-of-scope sprite.ts regeneration from d971696f that dropped
two unrelated dead icons (arrow-left-long, sort-desc); those belong in
a separate dead-code cleanup if desired. Add a comment at the
DesktopWindowControlsStyle type noting control width is style-dependent
(classic vs traffic-lights), so no fixed-width constant applies.

packages/ui/src/lib/desktop.ts

@@ -41,6 +41,7 @@ export type SkillCatalogConfig = {
 export type DesktopWindowControlsPosition = 'left' | 'right';
 export type DesktopWindowControlsSide = 'left' | 'right';
 export type DesktopWindowControlAction = 'close' | 'minimize' | 'maximize';
+// No fixed-width constant: control width depends on the style (classic vs traffic-lights).
 export type DesktopWindowControlsStyle = 'classic' | 'traffic-lights';
 
 export type DesktopSettings = {