Another larger refactor to fix sfu switches and in general proper

cleanup.

src/state/CallViewModel/localMember/LocalTransport.test.ts

@@ -7,6 +7,7 @@ Please see LICENSE in the repository root for full details.
 
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { type CallMembership } from "matrix-js-sdk/lib/matrixrtc";
+import { BehaviorSubject } from "rxjs";
 
 import { mockConfig, flushPromises } from "../../../utils/test";
 import { createLocalTransport$ } from "./LocalTransport";
@@ -117,4 +118,39 @@ describe("LocalTransport", () => {
       type: "livekit",
     });
   });
+
+  it("updates local transport when oldest member changes", async () => {
+    // Use config so transport discovery succeeds, but delay OpenID JWT fetch
+    mockConfig({
+      livekit: { livekit_service_url: "https://lk.example.org" },
+    });
+    const memberships$ = new BehaviorSubject(new Epoch([]));
+    const openIdResolver = Promise.withResolvers<openIDSFU.SFUConfig>();
+
+    vi.spyOn(openIDSFU, "getSFUConfigWithOpenID").mockReturnValue(
+      openIdResolver.promise,
+    );
+
+    const localTransport$ = createLocalTransport$({
+      scope,
+      roomId: "!room:example.org",
+      useOldestMember$: constant(true),
+      memberships$,
+      client: {
+        getDomain: () => "",
+        getOpenIdToken: vi.fn(),
+        getDeviceId: vi.fn(),
+      },
+    });
+
+    openIdResolver.resolve?.({ url: "https://lk.example.org", jwt: "jwt" });
+    expect(localTransport$.value).toBe(null);
+    await flushPromises();
+    // final
+    expect(localTransport$.value).toStrictEqual({
+      livekit_alias: "!room:example.org",
+      livekit_service_url: "https://lk.example.org",
+      type: "livekit",
+    });
+  });
 });