test(e2e): setup Playwright with login smoke test

- Installed @playwright/test + Chromium
- playwright.config.js: baseURL localhost:5001, Desktop Chrome
- tests/e2e/login.spec.js: validates login form loads and invalid
  credentials show error

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "autopartes",
+  "version": "1.0.0",
+  "description": "**POS + Catalogo de autopartes para refaccionarias mexicanas.**",
+  "main": "index.js",
+  "directories": {
+    "doc": "docs"
+  },
+  "scripts": {
+    "test": "playwright test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://consultoria-as:b708144ceef22fef31217f1259a695005d67477b@git.consultoria-as.com/consultoria-as/Autoparts-DB.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "devDependencies": {
+    "@playwright/test": "^1.59.1"
+  }
+}

playwright.config.js

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+const { defineConfig, devices } = require('@playwright/test');
+
+module.exports = defineConfig({
+  testDir: './tests/e2e',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: 'list',
+  use: {
+    baseURL: 'http://localhost:5001',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+});

tests/e2e/login.spec.js

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+const { test, expect } = require('@playwright/test');
+
+test.describe('Nexus POS — Login', () => {
+  test('login page loads with form', async ({ page }) => {
+    await page.goto('/pos/login');
+    await expect(page).toHaveTitle(/Nexus|Login/i);
+    await expect(page.locator('input[name="username"], input[name="email"], #username, #email')).toBeVisible();
+    await expect(page.locator('input[type="password"], #password')).toBeVisible();
+    await expect(page.locator('button[type="submit"], .btn--primary')).toBeVisible();
+  });
+
+  test('invalid credentials show error', async ({ page }) => {
+    await page.goto('/pos/login');
+    const userInput = page.locator('input[name="username"], input[name="email"], #username, #email').first();
+    const passInput = page.locator('input[type="password"], #password').first();
+    const submitBtn = page.locator('button[type="submit"], .btn--primary').first();
+
+    await userInput.fill('invalid_user');
+    await passInput.fill('wrong_password');
+    await submitBtn.click();
+
+    // Expect error toast or message
+    await expect(page.locator('.toast, .alert, .error, [role="alert"]')).toBeVisible({ timeout: 5000 });
+  });
+});