fix: version 2.4.0 -- menu lateral como drawer en celular

En pantallas angostas (<=768px) el sidebar arranca oculto y se abre
como panel superpuesto desde el boton de hamburguesa, con fondo
oscuro detras y cierre automatico al navegar o tocar afuera. El
escritorio no se toca: sigue igual que siempre.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "project-linkedcorp-frontend",
   "private": true,
-  "version": "2.3.0",
+  "version": "2.4.0",
   "type": "module",
   "scripts": {
     "dev": "vite",

frontend/src/app/AppShell.jsx

@@ -16,8 +16,11 @@ import { getUpdateStatus } from '../services/updater.js';
 
 const EMPTY_PASSWORD_FORM = { currentPassword: '', newPassword: '', confirmPassword: '' };
 
+const MOBILE_BREAKPOINT = 768;
+
 export default function AppShell() {
   const [navMode, setNavMode] = useState('expanded');
+  const [mobileNavOpen, setMobileNavOpen] = useState(false);
   const { user, logout } = useAuth();
   const { t, theme, setTheme, lang, setLang, pushToast, openDialog } = useUi();
   const navigate = useNavigate();
@@ -54,8 +57,19 @@ export default function AppShell() {
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
+  // En celular el boton de hamburguesa abre/cierra el drawer superpuesto (mobileNavOpen); en
+  // escritorio, sigue alternando el riel expandido/compacto de siempre -- son dos estados
+  // independientes para no tocar el comportamiento de escritorio ya existente.
   function toggleNav() {
-    setNavMode((m) => (m === 'expanded' ? 'compact' : 'expanded'));
+    if (window.innerWidth <= MOBILE_BREAKPOINT) {
+      setMobileNavOpen((v) => !v);
+    } else {
+      setNavMode((m) => (m === 'expanded' ? 'compact' : 'expanded'));
+    }
+  }
+
+  function closeMobileNav() {
+    setMobileNavOpen(false);
   }
 
   async function handleNotificationClick(notification) {
@@ -92,7 +106,8 @@ export default function AppShell() {
 
   return (
     <div className="app-shell">
-      <NavigationView mode={navMode} />
+      <NavigationView mode={navMode} mobileOpen={mobileNavOpen} onNavigate={closeMobileNav} />
+      <div className={`nav-backdrop ${mobileNavOpen ? 'visible' : ''}`} onClick={closeMobileNav} />
       <div className="content-column">
         <div className="topbar">
           <div className="topbar-left">

frontend/src/components/NavigationView.jsx

@@ -17,15 +17,17 @@ const ITEMS = [
   { to: '/configuracion', icon: Settings, labelKey: 'nav_config', superadminOnly: true },
 ];
 
-export function NavigationView({ mode }) {
+export function NavigationView({ mode, mobileOpen, onNavigate }) {
   const { t, theme } = useUi();
   const { user } = useAuth();
   const branding = useBranding();
-  const compact = mode === 'compact';
+  // En celular el drawer siempre se ve completo (con etiquetas), sin importar el modo
+  // compacto/expandido del riel de escritorio -- son dos cosas independientes.
+  const compact = mode === 'compact' && !mobileOpen;
   const items = ITEMS.filter((item) => !item.superadminOnly || user?.roleCode === 'superadmin');
   const brandName = branding.name || t('appName');
   return (
-    <nav className={`nav-view ${mode}`}>
+    <nav className={`nav-view ${mode} ${mobileOpen ? 'mobile-open' : ''}`}>
       {branding.logoUrl && (
         <div className="nav-header">
           <img
@@ -37,9 +39,9 @@ export function NavigationView({ mode }) {
       )}
       <div className="nav-items">
         {items.map((item) => (
-          <NavLink key={item.to} to={item.to} end={item.end} className={({ isActive }) => `nav-item ${isActive ? 'active' : ''}`}>
+          <NavLink key={item.to} to={item.to} end={item.end} onClick={onNavigate} className={({ isActive }) => `nav-item ${isActive ? 'active' : ''}`}>
             <item.icon />
-            {mode !== 'compact' && <span>{t(item.labelKey)}</span>}
+            {!compact && <span>{t(item.labelKey)}</span>}
           </NavLink>
         ))}
       </div>

frontend/src/styles/app.css

@@ -73,6 +73,33 @@ button { font-family: inherit; }
 .nav-logo-icon-header { width: 72px; height: 72px; flex: none; object-fit: contain; }
 .nav-logo-full-header { height: 64px; width: auto; max-width: 100%; object-fit: contain; }
 
+/* --- Menu lateral en celular: todo lo de acá abajo es exclusivo de pantallas angostas, no
+   toca nada del layout de escritorio (que sigue con el sidebar fijo de siempre). --- */
+.nav-backdrop { display: none; }
+
+@media (max-width: 768px) {
+  .nav-view, .nav-view.compact, .nav-view.expanded {
+    position: fixed;
+    top: 0; left: 0; bottom: 0;
+    width: 260px;
+    z-index: 60;
+    transform: translateX(-100%);
+    transition: transform .2s ease;
+    box-shadow: 4px 0 20px rgb(0 0 0 / .4);
+  }
+  .nav-view.mobile-open { transform: translateX(0); }
+
+  .nav-backdrop {
+    display: block;
+    position: fixed; inset: 0;
+    background: rgb(0 0 0 / .5);
+    z-index: 55;
+    opacity: 0; pointer-events: none;
+    transition: opacity .2s ease;
+  }
+  .nav-backdrop.visible { opacity: 1; pointer-events: auto; }
+}
+
 .content-column { flex: 1; display: flex; flex-direction: column; min-width: 0; }
 .topbar {
   height: 84px; flex: none; display: flex; align-items: center; justify-content: space-between;