fix(desktop/weixin-gzh): tolerate numeric appMsgId and classify login timeout

The MP draft API sometimes returns appMsgId as a number or under the
appmsgid alias; coerce both shapes before treating the response as a
success. Also extend the platform auth adapter to recognize 登录超时/
请重新登录 wording so the runtime drives the account back to re-auth.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/platform-auth-adapters.test.ts

@@ -94,6 +94,16 @@ describe("platform auth adapters", () => {
     ).toBe("challenge");
   });
 
+  it("classifies Weixin GZH login timeout as auth failure", () => {
+    const adapter = getPlatformAdapter("weixin_gzh");
+
+    expect(
+      adapter.classifyFailure({
+        message: "登录超时，请重新登录",
+      }),
+    ).toBe("auth_failure");
+  });
+
   it("classifies ZOL missing login as auth failure", () => {
     const adapter = getPlatformAdapter("zol");