refactor: dedupe matrix store record helper

extensions/matrix/src/matrix/client/file-sync-store.ts

@@ -11,6 +11,7 @@ import {
   type IStoredClientOpts,
 } from "matrix-js-sdk/lib/matrix.js";
 import { writeJsonFileAtomically } from "openclaw/plugin-sdk/json-store";
+import { isRecord } from "../../record-shared.js";
 import { createAsyncLock } from "../async-lock.js";
 import { LogService } from "../sdk/logger.js";
 import { claimCurrentTokenStorageState } from "./storage.js";
@@ -25,10 +26,6 @@ type PersistedMatrixSyncStore = {
   cleanShutdown?: boolean;
 };
 
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return typeof value === "object" && value !== null;
-}
-
 function normalizeRoomsData(value: unknown): IRooms | null {
   if (!isRecord(value)) {
     return null;