Merge pull request #10523 from overleaf/jel-update-focus-visible

[web] Update `focus-visible` for new CSS

GitOrigin-RevId: 20ae3ed2679859540ae157a210402c43121f40e1

services/web/frontend/stylesheets/core/mixins.less

@@ -129,7 +129,7 @@
   box-shadow: @shadow;
 }
 .box-shadow-button-input() {
-  box-shadow: 0px 0px 0px 2px rgba(50, 101, 178, 0.56);
+  box-shadow: 0px 0px 0px 2px @blue-30;
 }
 
 // Transitions

services/web/frontend/stylesheets/core/variables.less

@@ -30,6 +30,7 @@
 
 @blue: #405ebf;
 @blue-10: #f1f4f9;
+@blue-30: #97b6e5;
 @blueDark: #040d2d;
 @green: #46a546;
 @red: #a93529;