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/room/message/Reactions.tsx

@@ -39,7 +39,7 @@ export const Reactions = as<'div', ReactionsProps>(
     const myUserId = mx.getUserId();
     const reactions = useRelations(
       relations,
-      useCallback((rel) => [...(rel.getSortedAnnotationsByKey() ?? [])], [])
+      useCallback((rel) => [...(rel.getSortedAnnotationsByKey() ?? [])], []),
     );
 
     const handleViewReaction: MouseEventHandler<HTMLButtonElement> = (evt) => {
@@ -126,5 +126,5 @@ export const Reactions = as<'div', ReactionsProps>(
         )}
       </Box>
     );
-  }
+  },
 );