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/common-settings/developer-tools/StateEventEditor.tsx

@@ -47,21 +47,21 @@ function StateEventEdit({ type, stateKey, content, requestClose }: StateEventEdi
 
   const defaultContentStr = useMemo(
     () => JSON.stringify(content, undefined, EDITOR_INTENT_SPACE_COUNT),
-    [content]
+    [content],
   );
 
   const textAreaRef = useRef<HTMLTextAreaElement>(null);
   const [jsonError, setJSONError] = useState<SyntaxError>();
   const { handleKeyDown, operations, getTarget } = useTextAreaCodeEditor(
     textAreaRef,
-    EDITOR_INTENT_SPACE_COUNT
+    EDITOR_INTENT_SPACE_COUNT,
   );
 
   const [submitState, submit] = useAsyncCallback<object, MatrixError, [object]>(
     useCallback(
       (c) => mx.sendStateEvent(room.roomId, type as any, c, stateKey),
-      [mx, room, type, stateKey]
-    )
+      [mx, room, type, stateKey],
+    ),
   );
   const submitting = submitState.status === AsyncStatus.Loading;