feat: Use CSS contain to avoid computations (#3158)

app/javascript/styles/components.scss

@@ -1314,6 +1314,7 @@
 .drawer {
   flex: 1 1 100%;
   overflow: hidden;
+  contain: strict;
 }
 
 @media screen and (min-width: 360px) {
@@ -1488,6 +1489,7 @@
   flex: 1 1 auto;
   backface-visibility: hidden;
   -webkit-overflow-scrolling: touch;
+  contain: strict;
 
   &.optionally-scrollable {
     overflow-y: auto;
@@ -2234,6 +2236,7 @@ button.icon-button.active i.fa-retweet {
   flex: 1 1 auto;
   align-items: center;
   justify-content: center;
+  contain: strict;
 
   a {
     color: $ui-highlight-color;