fix(rewards): load and strengthen amount styles

tools/build-public-assets.mjs

@@ -35,6 +35,7 @@ const cssBundles = {
     'assets/css/frontend/modal-runtime.css',
     'assets/css/frontend/notyf.css',
     'assets/css/shared/captcha.css',
+    'assets/css/frontend/single-post/rewards.css',
   ],
   'homepage.css': [
     'assets/css/frontend/post-card.css',