chore: import gti-maquina-comercial history via subtree

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

git-subtree-dir: gti-maquina-comercial
git-subtree-mainline: 93ca82979e
git-subtree-split: b77484946f

gti-maquina-comercial/public/js/login.js

@@ -0,0 +1,16 @@
+/* Tela de login: autentica e redireciona para o app. */
+el('form-login').addEventListener('submit', async (event) => {
+  event.preventDefault();
+  const erroBox = el('login-erro');
+  erroBox.textContent = '';
+
+  try {
+    await API.post('/api/auth/login', {
+      username: el('login-username').value,
+      password: el('login-password').value
+    });
+    window.location.href = '/';
+  } catch (error) {
+    erroBox.textContent = error.message;
+  }
+});