feat(api): register admin-dashboard auth refresh handler

Add AdminDashboard/src/Utils/API.ts to register a refreshSession handler on BaseAPI
that posts to IDENTITY_URL/refresh-session (using skipAuthRefresh). Handle HTTP error
responses and exceptions, and set a refresh-failure handler that logs and falls back
to logout. Export BaseAPI. Import the module in Index.tsx for side-effect initialization.

AdminDashboard/src/Index.tsx

@@ -1,3 +1,4 @@
+import "./Utils/API";
 import App from "./App";
 import Telemetry from "Common/UI/Utils/Telemetry/Telemetry";
 import React from "react";

AdminDashboard/src/Utils/API.ts

@@ -0,0 +1,42 @@
+import BaseAPI from "Common/UI/Utils/API/API";
+import { IDENTITY_URL } from "Common/UI/Config";
+import HTTPErrorResponse from "Common/Types/API/HTTPErrorResponse";
+import URL from "Common/Types/API/URL";
+import { JSONObject } from "Common/Types/JSON";
+import { Logger } from "Common/UI/Utils/Logger";
+
+const registerAdminDashboardAuthRefresh = (): void => {
+  const refreshSession = async (): Promise<boolean> => {
+    try {
+      const response = await BaseAPI.post<JSONObject>({
+        url: URL.fromURL(IDENTITY_URL).addRoute("/refresh-session"),
+        options: {
+          skipAuthRefresh: true,
+        },
+      });
+
+      if (response instanceof HTTPErrorResponse) {
+        Logger.warn(
+          `Admin dashboard session refresh failed with status ${response.statusCode}.`,
+        );
+        return false;
+      }
+
+      return response.isSuccess();
+    } catch (err) {
+      Logger.error("Admin dashboard session refresh request failed.");
+      Logger.error(err as Error);
+      return false;
+    }
+  };
+
+  BaseAPI.setRefreshSessionHandler(refreshSession);
+
+  BaseAPI.setRefreshFailureHandler(() => {
+    Logger.warn("Admin dashboard session refresh failed; falling back to logout.");
+  });
+};
+
+registerAdminDashboardAuthRefresh();
+
+export default BaseAPI;