Refine token validation and update user stats endpoint.

Extend access token validation to include a 10-second buffer to prevent potential expiry issues. Modify the user stats API call to use the base `/stats/user` endpoint for improved consistency.

src/components/repo/authv2.ts

@@ -155,7 +155,7 @@ export class AuthV2Repo {
     }
 
     async request(url: string, params: RequestInit = {}) {
-        if (this.accessToken !== undefined && this.accessTokenExpires !== undefined && this.accessTokenExpires.isBefore(dayjs())) {
+        if (this.accessToken !== undefined && this.accessTokenExpires !== undefined && this.accessTokenExpires.isBefore(dayjs().add(10, "seconds"))) {
             await this.refresh();
         }