Pop out of Threads Activity Centre (#12136)

* Add `Thread Activity centre` labs flag

* Rename translation string

* WIP Thread Activity Centre

* Update supportedLevels

* css lint

* i18n lint

* Fix labs subsection test

* Update Threads Activity Centre label

* Rename Thread Activity Centre to Threads Activity Centre

* Use compound `MenuItem` instead of custom button

* Color thread icon when hovered

* Make the pop-up scrollable and add a max height

* Remove Math.random in key

* Remove unused class

* Change add comments on `mx_ThreadsActivityRows` and `mx_ThreadsActivityRow`

* Make threads activity centre labs flag split out unread counts

Just shows notif & unread counts for main thread if the TAC is enabled.

* Fix tests

* Simpler fix

* Open thread panel when thread clicke in Threads Activity Centre

Hopefully this is a sensible enough way. The panel will stay open of
course (ie. if you go to a different room & come back), but that's the
nature of the right panel.

* Dynamic state of room

* Add doc

* Use the StatelessNotificationBadge component in ThreadsActivityCentre

and re-use the existing NotificationLevel

* Remove unused style

* Add room sorting

* Fix `ThreadsActivityRow` props doc

* Pass in & cache the status of the TAC labs flag

* Pass includeThreads as setting to doesRoomHaveUnreadMessages too

* Fix tests

* Add analytics to the TAC (#12179)

* Update TAC label (#12186)

* Add `IndicatorIcon` to the TAC button (#12182)

Add `IndicatorIcon` to the TAC button

* Threads don't have activity if the room is muted

This makes it match the computation in determineUnreadState.
Ideally this logic should all be in one place.

* Re-use doesRoomHaveUnreadThreads for useRoomThreadNotifications

This incorporates the logic of not showing unread dots if the room
is muted

* Add TAC description in labs (#12197)

* Fox position & size of dot on the tac button

IndicatorIcon doesn't like having the size of its icon adjusted and
we probably shouldn't do it anyway: better to specify to the component
what size we want it.

* TAC: Utils tests (#12200)

* Add tests for `doesRoomHaveUnreadThreads`
* Add tests for `getThreadNotificationLevel`

* Add test for the ThreadsActivityCentre component

* Add snapshot test

* Fix narrow hover background on TAC button

Make the button 32x32 (and the inner icon 24x24)

* Add caption for empty TAC

* s/tac/threads_activity_centre/

* Fix i18n & add tests

* Add playwright tests for the TAC (#12227)

* Fox comments

---------

Co-authored-by: David Baker <dbkr@users.noreply.github.com>

src/utils/notifications.ts

@@ -134,3 +134,20 @@ export function notificationLevelToIndicator(
         return "critical";
     }
 }
+
+/**
+ * Return the thread notification level for a room
+ * @param room
+ * @returns {NotificationLevel}
+ */
+export function getThreadNotificationLevel(room: Room): NotificationLevel {
+    const notificationCountType = room.threadsAggregateNotificationType;
+    switch (notificationCountType) {
+        case NotificationCountType.Highlight:
+            return NotificationLevel.Highlight;
+        case NotificationCountType.Total:
+            return NotificationLevel.Notification;
+        default:
+            return NotificationLevel.Activity;
+    }
+}