fix(vitepress): install playwright browser (#355)

Author: sapphi-red

tests/vitepress.ts

@@ -10,6 +10,7 @@ export async function test(options: RunOptions) {
 		},
 		branch: 'main',
 		build: 'build',
+		beforeTest: 'pnpm playwright install chromium',
 		test: 'test',
 	})
 }