fix: prevent selecting `.visually-hidden` elements (#3501)

public/index.html

@@ -125,6 +125,7 @@
         overflow: hidden;
         clip: rect(1px, 1px, 1px, 1px);
         white-space: nowrap; /* added line */
+        user-select: none;
       }
 
       .LoadingMessage {

src/css/app.scss

@@ -5,6 +5,7 @@
   overflow: hidden;
   clip: rect(1px, 1px, 1px, 1px);
   white-space: nowrap; /* added line */
+  user-select: none;
 }
 
 .LoadingMessage {