Add 's' method to access theme props (#5163)

app/components/ContextMenu/Header.ts

@@ -1,10 +1,11 @@
 import styled from "styled-components";
+import { s } from "@shared/styles";
 
 const Header = styled.h3`
   font-size: 11px;
   font-weight: 600;
   text-transform: uppercase;
-  color: ${(props) => props.theme.sidebarText};
+  color: ${s("sidebarText")};
   letter-spacing: 0.04em;
   margin: 1em 12px 0.5em;
 `;