Ensure when TopicDetail is open document.body stops scrolling (#6285)

* fix: ensure TopicDetail locks the body when open

* chore: ensure 'overflow-hidden' is always available via safelist

* revert: prettier changes

tailwind.config.cjs

@@ -7,6 +7,7 @@ module.exports = {
   future: {
     hoverOnlyWhenSupported: true,
   },
+  safelist: ['overflow-hidden'],
   theme: {
     extend: {
       typography: {