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/features/message-search/MessageSearch.tsx

@@ -33,7 +33,7 @@ const useSearchPathSearchParams = (searchParams: URLSearchParams): _SearchPathSe
       rooms: searchParams.get('rooms') ?? undefined,
       senders: searchParams.get('senders') ?? undefined,
     }),
-    [searchParams]
+    [searchParams],
   );
 
 type MessageSearchProps = {
@@ -69,7 +69,7 @@ export function MessageSearch({
   const searchParamRooms = useMemo(() => {
     if (searchPathSearchParams.rooms) {
       const joinedRoomIds = decodeSearchParamValueArray(searchPathSearchParams.rooms).filter(
-        (rId) => allRooms.includes(rId)
+        (rId) => allRooms.includes(rId),
       );
       return joinedRoomIds;
     }