test: update coverage config

bring back vitest v1 behavior and exclude docs

Author: pionxzh

vite.config.ts

@@ -6,6 +6,10 @@ export default defineConfig({
   test: {
     setupFiles: './tests/setup.ts',
     globals: true,
-    environment: 'jsdom'
+    environment: 'jsdom',
+    coverage: {
+      include: ['src'],
+      ignoreEmptyLines: false
+    }
   }
 })