feat: Implement forum feed layout and refactor space navigation logic to support new routing structure

src/app/features/forum/ForumAwareSpaceLayout.tsx

@@ -1,15 +1,31 @@
-import React from 'react';
+import React, { useMemo } from 'react';
 import { PageRoot } from '../../components/page';
 import { AnimatedOutlet } from '../../components/AnimatedOutlet';
 import { MobileFriendlyPageNav } from '../../pages/MobileFriendly';
 import { SPACE_PATH } from '../../pages/paths';
 import { Space } from '../../pages/client/space/Space';
+import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { useSelectedRoom } from '../../hooks/router/useSelectedRoom';
+import { useSpace } from '../../hooks/useSpace';
+import { isForumContainer, shouldShowForumLobby } from '../../utils/room';
+import { ForumBoardProvider } from './ForumBoardContext';
 
 /**
  * Space sidebar + outlet. Forum spaces render ForumFeedSidebar in Space.tsx.
  */
 export function ForumAwareSpaceLayout() {
-  return (
+  const mx = useMatrixClient();
+  const space = useSpace();
+  const selectedRoomId = useSelectedRoom();
+
+  const scope = useMemo(() => {
+    const room = selectedRoomId ? mx.getRoom(selectedRoomId) : null;
+    const topicRoomId =
+      room && room.roomId !== space.roomId && !isForumContainer(room) ? room.roomId : undefined;
+    return { forumSpaceId: space.roomId, topicRoomId };
+  }, [mx, selectedRoomId, space.roomId]);
+
+  const layout = (
     <PageRoot
       nav={
         <MobileFriendlyPageNav path={SPACE_PATH}>
@@ -20,4 +36,14 @@ export function ForumAwareSpaceLayout() {
       <AnimatedOutlet />
     </PageRoot>
   );
+
+  if (!shouldShowForumLobby(space)) {
+    return layout;
+  }
+
+  return (
+    <ForumBoardProvider forumSpace={space} scope={scope}>
+      {layout}
+    </ForumBoardProvider>
+  );
 }