Add a Window controls Style setting ('classic' | 'traffic-lights',
default 'classic') next to the existing Position setting. All four
position×style combinations render correctly with side-driven order
(close,min,max left; min,max,close right).
- Restore deleted left-classic branch (h-8 w-8 rounded-md buttons)
- Add right-traffic-lights branch (cluster with ml-1 container)
- Branch on style instead of side in WindowsWindowControls
- Store field + setter with 'classic' default (no migration needed;
Zustand persist shallow-merges over initial state)
- Settings UI: SettingsTwoColumn with Position chips + Style dropdown
- Sanitize on client (persistence.ts) and server (settings-helpers.js)
- 10 locale dictionaries updated (add-only, no existing keys changed)
- Traffic-light button spacing 8px→10px edge-to-edge
- Delete dead DESKTOP_WINDOW_CONTROLS_WIDTH_PX constant