Remove highlight from clicked external link

The record video link kept being highlighted after it was clicked,
meaning more than one nav item was highlighted since the active route
always is. This fixes the issue.

frontend/src/ui/index.tsx

@@ -91,7 +91,7 @@ export const linkWithIconStyle = (isDark: boolean, iconPos: "left" | "right", ac
             }),
         },
 
-        "&:hover, &:focus": hoverActiveStyle,
+        "&:hover, &:focus-visible": hoverActiveStyle,
         ...active && {
             color: COLORS.primary2,
             "&": hoverActiveStyle,