Preparations for React 18 (#12860)

* Add missing types

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Eagerly add `children` to props in prep for React 18

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Avoid assuming that setState immediately sets `this.state` values

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Add missing context declaration

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix UserFriendlyError types to work with React 18

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/ThreadPanel.tsx

@@ -117,7 +117,7 @@ export const ThreadPanelHeader: React.FC<{
     ) : null;
 
     const onMarkAllThreadsReadClick = React.useCallback(
-        (e) => {
+        (e: React.MouseEvent) => {
             PosthogTrackers.trackInteraction("WebThreadsMarkAllReadButton", e);
             if (!roomContext.room) {
                 logger.error("No room in context to mark all threads read");