re-add SFNSDisplay-Regular as a fallback

Author: MaxxusX

src/style/variable.scss

@@ -4,7 +4,7 @@ $font-size: 14px;
 $font-size-s: 12px;
 $font-size-l: 16px;
 
-$font-family: -apple-system, system-ui, BlinkMacSystemFont, 'Helvetica Neue', 'Lucida Grande',
+$font-family: -apple-system, system-ui, BlinkMacSystemFont, '.SFNSDisplay-Regular', 'Helvetica Neue', 'Lucida Grande',
   'Segoe UI', Tahoma, sans-serif;
 
 $anim-duration: 0.3s;