Initial commit: Vuelato - buscador de vuelos

Nuxt 4 + Supabase + Flightics API. Incluye búsqueda de vuelos,
inspiraciones, watchlist, tracking de precios y mapa interactivo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/composables/useAuth.ts

@@ -0,0 +1,43 @@
+export function useAuth() {
+  const supabase = useSupabaseClient()
+  const user = useSupabaseUser()
+
+  const loading = ref(false)
+  const error = ref<string | null>(null)
+
+  async function login(email: string, password: string) {
+    loading.value = true
+    error.value = null
+    const { error: err } = await supabase.auth.signInWithPassword({ email, password })
+    if (err) error.value = err.message
+    loading.value = false
+    return !err
+  }
+
+  async function register(email: string, password: string) {
+    loading.value = true
+    error.value = null
+    const { error: err } = await supabase.auth.signUp({ email, password })
+    if (err) error.value = err.message
+    loading.value = false
+    return !err
+  }
+
+  async function loginWithGoogle() {
+    loading.value = true
+    error.value = null
+    const { error: err } = await supabase.auth.signInWithOAuth({
+      provider: 'google',
+      options: { redirectTo: `${window.location.origin}/auth/confirm` }
+    })
+    if (err) error.value = err.message
+    loading.value = false
+  }
+
+  async function logout() {
+    await supabase.auth.signOut()
+    await navigateTo('/')
+  }
+
+  return { user, loading, error, login, register, loginWithGoogle, logout }
+}