WIP subspace support

lib/controllers/spaces_controller.dart

@@ -103,12 +103,14 @@ class SpacesController extends Notifier<IList<Space>> {
             title: "Home",
             icon: Icons.home,
             children: homeRooms,
+            subSpaces: .new(),
           ),
           .new(
             id: "dms",
             title: "Direct Messages",
             icon: Icons.people,
             children: dmRooms,
+            subSpaces: .new(),
           ),
           ...topLevelSpacesList,
         ]

lib/models/space.dart

@@ -2,6 +2,7 @@ import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:flutter/widgets.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
 import "package:nexus/models/room.dart";
+import "package:nexus/models/subspace.dart";
 part "space.freezed.dart";
 
 @freezed
@@ -12,5 +13,6 @@ abstract class Space with _$Space {
     IconData? icon,
     Room? room,
     required IList<Room> children,
+    required IList<Subspace> subSpaces,
   }) = _Space;
 }

lib/models/subspace.dart

@@ -0,0 +1,10 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/room.dart";
+part "subspace.freezed.dart";
+
+@freezed
+abstract class Subspace with _$Subspace {
+  const factory Subspace({required Room room, required IList<Room> children}) =
+      _Subspace;
+}

lib/widgets/join_dialog.dart

@@ -84,9 +84,15 @@ class JoinDialog extends HookWidget {
                               space?.id ??
                                   spaces
                                       .firstWhere(
-                                        (space) => space.children.any(
+                                        (space) =>
-                                          (child) => child.metadata?.id == id,
+                                            space.children.any(
-                                        ),
+                                              (child) =>
+                                                  child.metadata?.id == id,
+                                            ) ||
+                                            space.subSpaces.any(
+                                              (child) =>
+                                                  child.room.metadata?.id == id,
+                                            ),
                                       )
                                       .id,
                             );

lib/widgets/sidebar.dart

@@ -1,9 +1,11 @@
 import "package:collection/collection.dart";
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:flutter/material.dart";
 import "package:hooks_riverpod/hooks_riverpod.dart";
 import "package:navigation_rail_m3e/navigation_rail_m3e.dart";
 import "package:nexus/controllers/key_controller.dart";
 import "package:nexus/controllers/spaces_controller.dart";
+import "package:nexus/models/room.dart";
 import "package:nexus/widgets/avatar_or_hash.dart";
 import "package:nexus/widgets/join_dialog.dart";
 import "package:nexus/widgets/room_menu.dart";
@@ -43,6 +45,27 @@ class Sidebar extends HookConsumerWidget {
         ? null
         : indexOfSelectedRoom;
 
+    List<NavigationRailM3EDestination> roomsToDestinations(IList<Room> rooms) =>
+        rooms
+            .map(
+              (room) => NavigationRailM3EDestination(
+                label: room.metadata?.name ?? "Unnamed Room",
+                badgeCount: switch (room.metadata?.unreadNotifications) {
+                  0 || null => room.metadata?.unreadMessages == 0 ? null : 0,
+                  int unread => unread,
+                },
+                icon: AvatarOrHash(
+                  room.metadata?.avatar,
+                  room.metadata?.name ?? "Unnamed Room",
+                  fallback: selectedSpaceId == "dms"
+                      ? null
+                      : Icon(Icons.numbers),
+                  //  space.client.headers,
+                ),
+              ),
+            )
+            .toList();
+
     return Drawer(
       width: 340,
       shape: Border(),
@@ -189,29 +212,15 @@ class Sidebar extends HookConsumerWidget {
                   selectedIndex: selectedRoomIndex ?? 0,
                   sections: [
                     .new(
-                      destinations: selectedSpace.children
+                      destinations: roomsToDestinations(selectedSpace.children),
-                          .map(
-                            (room) => NavigationRailM3EDestination(
-                              label: room.metadata?.name ?? "Unnamed Room",
-                              badgeCount: switch (room
-                                  .metadata
-                                  ?.unreadNotifications) {
-                                0 || null =>
-                                  room.metadata?.unreadMessages == 0 ? null : 0,
-                                int unread => unread,
-                              },
-                              icon: AvatarOrHash(
-                                room.metadata?.avatar,
-                                room.metadata?.name ?? "Unnamed Room",
-                                fallback: selectedSpaceId == "dms"
-                                    ? null
-                                    : Icon(Icons.numbers),
-                                //  space.client.headers,
-                              ),
-                            ),
-                          )
-                          .toList(),
                     ),
+                    for (final subSpace in selectedSpace.subSpaces)
+                      .new(
+                        header: Text(
+                          subSpace.room.metadata?.name ?? "Unnamed Room",
+                        ),
+                        destinations: roomsToDestinations(subSpace.children),
+                      ),
                   ],
                   onDestinationSelected: (value) {
                     selectedRoomIdNotifier.set(