add back btn for mobile view (#1861)

src/app/pages/client/explore/Featured.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import { Box, Icon, Icons, Scroll, Text } from 'folds';
+import { Box, Icon, IconButton, Icons, Scroll, Text } from 'folds';
 import { useAtomValue } from 'jotai';
 import { useClientConfig } from '../../../hooks/useClientConfig';
 import { RoomCard, RoomCardGrid } from '../../../components/room-card';
@@ -9,21 +9,38 @@ import {
   Page,
   PageContent,
   PageContentCenter,
+  PageHeader,
   PageHero,
   PageHeroSection,
 } from '../../../components/page';
 import { RoomTopicViewer } from '../../../components/room-topic-viewer';
 import * as css from './style.css';
 import { useRoomNavigate } from '../../../hooks/useRoomNavigate';
+import { ScreenSize, useScreenSizeContext } from '../../../hooks/useScreenSize';
+import { BackRouteHandler } from '../../../components/BackRouteHandler';
 
 export function FeaturedRooms() {
   const { featuredCommunities } = useClientConfig();
   const { rooms, spaces } = featuredCommunities ?? {};
   const allRooms = useAtomValue(allRoomsAtom);
+  const screenSize = useScreenSizeContext();
   const { navigateSpace, navigateRoom } = useRoomNavigate();
 
   return (
     <Page>
+      {screenSize === ScreenSize.Mobile && (
+        <PageHeader>
+          <Box shrink="No">
+            <BackRouteHandler>
+              {(onBack) => (
+                <IconButton onClick={onBack}>
+                  <Icon src={Icons.ArrowLeft} />
+                </IconButton>
+              )}
+            </BackRouteHandler>
+          </Box>
+        </PageHeader>
+      )}
       <Box grow="Yes">
         <Scroll hideTrack visibility="Hover">
           <PageContent>