fix: Follow up for spaces hierarchy

- fix endless spinner
- fix rooms shon twice
- fix spaces accidentally opened as rooms
- add missing spaces header to spaces view

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

lib/utils/space_navigator.dart

@@ -0,0 +1,23 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+/// this is a workaround to allow navigation of spaces out from any widget.
+/// Reason is that we have no reliable way to listen on *query* changes of
+/// VRouter.
+///
+/// Time wasted: 3h
+abstract class SpaceNavigator {
+  const SpaceNavigator._();
+
+  // TODO(TheOneWithTheBraid): adjust routing table in order to represent spaces
+  // ... in any present path
+  static final routeObserver = RouteObserver();
+
+  static final StreamController<String?> _controller =
+      StreamController.broadcast();
+
+  static Stream<String?> get stream => _controller.stream;
+
+  static void navigateToSpace(String? spaceId) => _controller.add(spaceId);
+}