Add user info header to authentication dropdown

- Created /api/auth/userinfo endpoint to fetch user data from Authentik headers
- Added userInfo state and fetchUserInfo() function to useAuth composable
- Implemented compact user info header in dropdown with avatar, name, and email
- Avatar shows user initials with gradient background
- Styled with glassmorphism design matching app aesthetic

composables/useAuth.ts

@@ -6,6 +6,9 @@ const isAuthenticated = ref(true) // Asumimos autenticado al inicio (si la pági
 const isCheckingAuth = ref(false)
 const lastCheckTime = ref(0)
 
+// Estado de información del usuario
+const userInfo = ref(null)
+
 // Listener para cambios de autenticación desde otras tabs/ventanas
 let visibilityChangeListener: (() => void) | null = null
 let focusListener: (() => void) | null = null
@@ -106,12 +109,31 @@ export const useAuth = () => {
     window.location.href = window.location.origin + '/'
   }
 
+  const fetchUserInfo = async () => {
+    if (!isAuthenticated.value) {
+      console.log('[Auth] Cannot fetch user info - not authenticated')
+      return
+    }
+
+    try {
+      const info = await $fetch('/api/auth/userinfo')
+      userInfo.value = info
+      console.log('[Auth] User info loaded:', info)
+    } catch (error) {
+      console.warn('[Auth] Failed to fetch user info:', error)
+      userInfo.value = null
+    }
+  }
+
   const logout = async () => {
     console.log('[Auth] Logging out...')
 
     // Marcar como no autenticado y desregistrar SW
     await markUnauthenticated()
 
+    // Limpiar información del usuario
+    userInfo.value = null
+
     // Navegar directamente al servidor de Authentik para logout
     // Authentik tiene un flujo de invalidación por defecto que cierra la sesión
     console.log('[Auth] Navigating to Authentik logout...')
@@ -198,8 +220,10 @@ export const useAuth = () => {
     authChecked,
     isCheckingAuth,
     authStatus,
+    userInfo,
     checkAuth,
     triggerAuth,
+    fetchUserInfo,
     logout,
     markUnauthenticated,
     setupVisibilityListener,