feat: update Playwright config for CI environment and enhance sign-in page styles

frontend/playwright.config.ts

@@ -38,7 +38,9 @@ export default defineConfig({
     },
   ],
   webServer: {
-    command: `bun run start -- --host 127.0.0.1 --port ${e2ePort}`,
+    command: process.env['CI']
+      ? `bun run build && bunx serve -s dist/lmnp-frontend/browser -l ${e2ePort}`
+      : `bun run start -- --host 127.0.0.1 --port ${e2ePort}`,
     url: `http://127.0.0.1:${e2ePort}`,
     reuseExistingServer: !process.env['CI'],
     timeout: 120_000,