feat: force flat list on view model

This is an intermediary step before implementing sections in the vm. We
force the flat list but we use the underneath the view supporting
sections.

Author: florianduros

apps/web/src/viewmodels/room-list/RoomListViewViewModel.ts

@@ -61,6 +61,8 @@ export class RoomListViewViewModel
         const roomsResult = RoomListStoreV3.instance.getSortedRoomsInActiveSpace(undefined);
         const canCreateRoom = hasCreateRoomRights(props.client, activeSpace);
         const filterIds = [...filterKeyToIdMap.values()];
+        const roomIds = roomsResult.rooms.map((room) => room.roomId);
+        const sections = [{ id: "all", roomIds }];
 
         super(props, {
             // Initial view state - start with empty, will populate in async init
@@ -73,7 +75,9 @@ export class RoomListViewViewModel
                 spaceId: roomsResult.spaceId,
                 filterKeys: undefined,
             },
-            roomIds: roomsResult.rooms.map((room) => room.roomId),
+            // Until we implement sections, this view model only supports the flat list mode
+            isFlatList: true,
+            sections,
             canCreateRoom,
         });
 
@@ -195,6 +199,15 @@ export class RoomListViewViewModel
         return viewModel;
     }
 
+    /**
+     * Not implemented - this view model does not support sections.
+     * Flat list mode is forced so this method is never be called.
+     * @throw Error if called
+     */
+    public getSectionViewModel(): never {
+        throw new Error("Sections are not supported in this room list");
+    }
+
     /**
      * Update which rooms are currently visible.
      * Called by the view when scroll position changes.
@@ -408,6 +421,7 @@ export class RoomListViewViewModel
         // Build the complete state atomically to ensure consistency
         // roomIds and roomListState must always be in sync
         const roomIds = this.roomIds;
+        const sections = [{ id: "all", roomIds }];
 
         // Update filter keys - only update if they have actually changed to prevent unnecessary re-renders of the room list
         const previousFilterKeys = this.snapshot.current.roomListState.filterKeys;
@@ -428,7 +442,7 @@ export class RoomListViewViewModel
             isRoomListEmpty,
             activeFilterId,
             roomListState,
-            roomIds,
+            sections,
         });
     }