Estate: lint and type fixes in the new files

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/app/features/estate/joinEstateRoom.test.ts

@@ -18,8 +18,7 @@ const recordingClient = (joinRoom = vi.fn().mockResolvedValue({ roomId: '!r:game
           return joinRoom(...args);
         };
       }
-      return (...args: unknown[]) => {
-        void args;
+      return () => {
         calls.push(prop);
         throw new Error(`unexpected client call: ${prop}`);
       };

src/app/features/estate/useEstate.ts

@@ -104,7 +104,7 @@ export const useEstate = (rootId: string): Estate => {
     });
     return buildEstate({
       rootId,
-      hierarchy: Array.from(rooms.values()) as EstateHierarchyRoom[],
+      hierarchy: Array.from(rooms.values()) as unknown as EstateHierarchyRoom[],
       stewardships,
       membership,
       directRoomIds: Array.from(mDirects).filter((id) => joined.includes(id)),