feat(erp-frontend-vue): add Playwright E2E tests and update layout

Add Playwright configuration and E2E specs for key production, purchasing, and warehouse flows, and update layout/login to align with the new testing setup.

Made-with: Cursor

erp-frontend-vue/playwright.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig, devices } from '@playwright/test'
+
+export default defineConfig({
+  testDir: './tests',
+  timeout: 60 * 1000,
+  expect: {
+    timeout: 5 * 1000
+  },
+  use: {
+    baseURL: process.env.ERP_BASE_URL || 'http://localhost:5173',
+    headless: true,
+    viewport: { width: 1440, height: 900 },
+    ignoreHTTPSErrors: true,
+    trace: 'on-first-retry'
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] }
+    }
+  ]
+})
+