fix: storefront live search relative URLs + auth error messages + TPV clock

- Storefront: use relative URLs in api.ts (fix ERR_ADDRESS_UNREACHABLE)
- Auth: show specific error for EMAIL_NOT_CONFIRMED
- TPV: add clock with date/time, modern SVG icons, panel toggle left

project/frontend/src/app/auth/login/page.tsx

@@ -35,6 +35,13 @@ export default function LoginPage() {
           {error && (
             <div className="bg-red-50 border border-red-200 text-red-700 text-sm rounded-lg px-4 py-3">
               {error}
+              {error.includes('no confirmado') && (
+                <div className="mt-2">
+                  <Link href="/auth/recuperar" className="underline font-medium hover:no-underline">
+                    Solicitar nuevo enlace de confirmación
+                  </Link>
+                </div>
+              )}
             </div>
           )}
           <div>

project/frontend/src/app/auth/register/page.tsx

@@ -65,6 +65,13 @@ export default function RegisterPage() {
           {error && (
             <div className="bg-red-50 border border-red-200 text-red-700 text-sm rounded-lg px-4 py-3">
               {error}
+              {error.includes('ya está registrado') && (
+                <div className="mt-2">
+                  <Link href="/auth/login" className="underline font-medium hover:no-underline">
+                    Inicia sesión con tu cuenta existente
+                  </Link>
+                </div>
+              )}
             </div>
           )}
           <div>