feat(mobile): mount MobileLayout alongside desktop shell, remove legacy sidebar mobile-drawer

src/app/(dashboard)/layout.tsx

@@ -12,6 +12,7 @@ import { PortProvider } from '@/providers/port-provider';
 import { PermissionsProvider } from '@/providers/permissions-provider';
 import { Sidebar } from '@/components/layout/sidebar';
 import { Topbar } from '@/components/layout/topbar';
+import { MobileLayout } from '@/components/layout/mobile/mobile-layout';
 
 export default async function DashboardLayout({ children }: { children: React.ReactNode }) {
   const session = await auth.api.getSession({ headers: await headers() });
@@ -37,7 +38,8 @@ export default async function DashboardLayout({ children }: { children: React.Re
       <PortProvider ports={ports} defaultPortId={ports[0]?.id ?? null}>
         <PermissionsProvider>
           <SocketProvider>
-            <div className="flex h-screen overflow-hidden bg-background">
+            {/* Desktop shell — hidden by CSS on mobile */}
+            <div data-shell="desktop" className="flex h-screen overflow-hidden bg-background">
               <Sidebar
                 portRoles={portRoles}
                 isSuperAdmin={profile?.isSuperAdmin ?? false}
@@ -57,6 +59,9 @@ export default async function DashboardLayout({ children }: { children: React.Re
                 <main className="flex-1 overflow-y-auto bg-background p-6">{children}</main>
               </div>
             </div>
+
+            {/* Mobile shell — hidden by CSS on desktop */}
+            <MobileLayout>{children}</MobileLayout>
           </SocketProvider>
         </PermissionsProvider>
       </PortProvider>