fix(msteams): improve graph user and token parsing

extensions/msteams/src/graph.ts

@@ -1,6 +1,7 @@
 import type { MSTeamsConfig } from "openclaw/plugin-sdk";
 import { GRAPH_ROOT } from "./attachments/shared.js";
 import { loadMSTeamsSdkWithAuth } from "./sdk.js";
+import { readAccessToken } from "./token-response.js";
 import { resolveMSTeamsCredentials } from "./token.js";
 
 export type GraphUser = {
@@ -22,18 +23,6 @@ export type GraphChannel = {
 
 export type GraphResponse<T> = { value?: T[] };
 
-function readAccessToken(value: unknown): string | null {
-  if (typeof value === "string") {
-    return value;
-  }
-  if (value && typeof value === "object") {
-    const token =
-      (value as { accessToken?: unknown }).accessToken ?? (value as { token?: unknown }).token;
-    return typeof token === "string" ? token : null;
-  }
-  return null;
-}
-
 export function normalizeQuery(value?: string | null): string {
   return value?.trim() ?? "";
 }