Add notification dots to thread summary icons (#12146)

* Add notification dots to thread summary icons

Adopts new IndicatorIcon from compound to have threads icons with
indicator dot (that aren't also buttons). Adds green & red dots on
the threads icon in the thread summary to indicate notifications.
Changes the notification level dots colours in the threads panel to
be green to match.

* Update test for new CSS class

* Update snapshots with new class name

* Another snapshot update for new class name

* Replace more uses of old class name in tests

* More snapshot updates for new class name

* Unsure how this ever worked in chronological mode

* More snapshot updates

* Fix dot colours

* Upgrade to compound-web 3

* Fix computed notification levels

* Add test for notificationLevelToIndicator

src/hooks/room/useRoomThreadNotifications.ts

@@ -33,10 +33,10 @@ export const useRoomThreadNotifications = (room: Room): NotificationLevel => {
         switch (room?.threadsAggregateNotificationType) {
             case NotificationCountType.Highlight:
                 setNotificationLevel(NotificationLevel.Highlight);
-                break;
+                return;
             case NotificationCountType.Total:
                 setNotificationLevel(NotificationLevel.Notification);
-                break;
+                return;
         }
         // We don't have any notified messages, but we might have unread messages. Let's
         // find out.