chore: upgrade i18next 26, prettier 3, fontsource-variable, domhandler 6, lint-staged 17

- i18next 23->26 + react-i18next 15->17
- prettier 2->3, reformat all files
- replace @fontsource/inter with @fontsource-variable/inter 5, update import path
- domhandler 5->6 (aligns with transitive deps)
- lint-staged 16->17

src/app/components/editor/autocomplete/UserMentionAutocomplete.tsx

@@ -98,7 +98,7 @@ export function UserMentionAutocomplete({
 
   const [result, search, resetSearch] = useAsyncSearch(members, getRoomMemberStr, SEARCH_OPTIONS);
   const autoCompleteMembers = (result ? result.items.slice(0, 20) : members.slice(0, 20)).filter(
-    withAllowedMembership
+    withAllowedMembership,
   );
 
   useEffect(() => {
@@ -110,7 +110,7 @@ export function UserMentionAutocomplete({
     const mentionEl = createMentionElement(
       uId,
       name.startsWith('@') ? name : `@${name}`,
-      mx.getUserId() === uId || roomAliasOrId === uId
+      mx.getUserId() === uId || roomAliasOrId === uId,
     );
     replaceWithElement(editor, query.range, mentionEl);
     moveCursor(editor, true);