feat(ui): keep one side panel open per desktop sidebar in every HUD layout

The Cyber accordion now applies to both sidebars and every HUD layout:
opening a side panel collapses its peers, the layout normalizes restored
state to one owner, and collapsed panels are hidden on desktop. Phones keep
showing several panels per sheet.

src/ui/mobileShell.js

@@ -208,7 +208,7 @@ export function initMobileShell({
     return (
       classes.contains('collapsed') &&
       !classes.contains('layout-auto-collapsed') &&
-      !classes.contains('cyber-accordion-collapsed')
+      !classes.contains('accordion-collapsed')
     );
   };