perf/UX audit round 2, fix eggplant reaction button

Runtime: memoize selectors in report modal, event discussion,
followed tag filter, and upload form to avoid unnecessary allocations.

Bundle: lazy-load crypto icons (500+ SVGs), remove datepicker CSS from
main entry (already in lazy wrapper), drop unused Inter 200/300 weights.

Stability: add null guards in compose upload and conversation components,
add keyboard handler to reply mentions button, surface local translation
unavailability instead of swallowing errors.

Fix eggplant button: preferences toggle was still writing to the old
showWrenchButton setting key, so the eggplant reaction button could
never be enabled.

packages/pl-fe/src/pages/statuses/event-discussion.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useEffect, useRef, useState } from 'react';
+import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { FormattedMessage, useIntl } from 'react-intl';
 
 import { eventDiscussionCompose } from '@/actions/compose';
@@ -32,7 +32,8 @@ const EventDiscussionPage: React.FC = () => {
 
   const me = useAppSelector((state) => state.me);
 
-  const descendantsIds = useAppSelector(state => getDescendantsIds(state, statusId).filter(id => id !== statusId));
+  const allDescendantsIds = useAppSelector(state => getDescendantsIds(state, statusId));
+  const descendantsIds = useMemo(() => allDescendantsIds.filter(id => id !== statusId), [allDescendantsIds, statusId]);
 
   const [isLoaded, setIsLoaded] = useState<boolean>(!!status);