fix: harden Pi management readiness

frontend/src/test/msw-contract.test.ts

@@ -0,0 +1,7 @@
+import { checkDwhHealth } from "../api/sessions";
+
+// Catches shared browser test fixtures drifting from the same-origin /api contract and
+// attempting real localhost network requests instead of using MSW.
+test("the shared MSW health fixture follows the browser same-origin API contract", async () => {
+  await expect(checkDwhHealth()).resolves.toEqual({ ok: true, detail: "ok" });
+});

frontend/src/test/msw.ts

@@ -1,5 +1,5 @@
 import { setupServer } from "msw/node";
 import { http, HttpResponse } from "msw";
 export const server = setupServer(
-  http.get("http://localhost:8787/health/dwh", () => HttpResponse.json({ ok: true, detail: "ok" })),
+  http.get("/api/health/dwh", () => HttpResponse.json({ ok: true, detail: "ok" })),
 );