add scss.d.ts

packages/ui/src/@types/scss.d.ts

@@ -0,0 +1,6 @@
+// prevent TS2307: Cannot find module './xxx.module.scss' or its corresponding type declarations.
+declare module '*.module.scss' {
+  const classes: Record<string, string>;
+  // biome-ignore lint/style/noDefaultExport: CSS Modules require default export
+  export default classes;
+}