UI: add back button to header

pkgs/webview-ui/app/src/layout/header.tsx

@@ -1,14 +1,17 @@
 import { JSX } from "solid-js";
 import { Typography } from "../components/Typography";
+import { BackButton } from "../components/BackButton";
 
 interface HeaderProps {
   title: string;
   toolbar?: JSX.Element;
+  showBack?: boolean;
 }
 export const Header = (props: HeaderProps) => {
   return (
     <div class="navbar border-b px-6 py-4 border-def-3">
       <div class="flex-none">
+        {props.showBack && <BackButton />}
         <span class="tooltip tooltip-bottom lg:hidden" data-tip="Menu">
           <label
             class="btn btn-square btn-ghost drawer-button"
@@ -19,7 +22,7 @@ export const Header = (props: HeaderProps) => {
         </span>
       </div>
       <div class="flex-1">
-        <Typography hierarchy="title" size="m" weight="medium">
+        <Typography hierarchy="title" size="m" weight="medium" class="">
           {props.title}
         </Typography>
       </div>