fix: bind Vite dev server to 127.0.0.1 for CI compatibility

The dev server was binding to 'localhost' by default, but Playwright
was trying to connect to '127.0.0.1'. In CI environments, these may
not resolve to the same address, causing connection timeouts.

This fix explicitly sets host: '127.0.0.1' in the Vite server config
to match the Playwright webServer.url configuration.

Fixes: E2E test timeout errors in GitHub Actions

Author: claude

vite.config.js

@@ -25,6 +25,7 @@ export default defineConfig({
   // Use public as the root for dev server (for E2E tests)
   root: 'public',
   server: {
+    host: '127.0.0.1',
     port: 8080,
     strictPort: true,
     fs: {