fix: add html/body height:100% + 100% height on sidebar/main

- html,body { height:100% } to ensure proper height chain
- ms-side { height: 100% } and ms-main { height: 100% }
- Both resolve to same parent content height: 100vh - 56px

src/App.vue

@@ -188,6 +188,7 @@ onUnmounted(() => {
 
 <style>
 @import './assets/wordpress-exact.css';
+html, body { height: 100%; margin: 0; }
 </style>
 
 <style scoped>