Identify transports by server name as well as URLs

A transport with only a LiveKit SFU `url` has to be authenticated through
our own homeserver, which needs to know the name of the server owning the
SFU. Carry that name alongside the transport as a TransportLocator,
derived from the member's user ID for remote transports and from the
client's domain for our own, and key the connection map on the SFU URL,
the service URL and the server name together so that `url`, service URL
and combined transport shapes are deduplicated consistently.

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

@@ -293,7 +293,7 @@ describe("LocalMembership", () => {
         leave: vi.fn(),
       },
       connectionMap$: constant(new Epoch(new ConnectionMap())),
-      localTransport$: constant(mockTransport),
+      localTransport$: constant(mockTransportLocator),
     });
     const expextedLog =
       "'not connected yet' while updating the call intent (this is expected on startup)";
@@ -308,6 +308,11 @@ describe("LocalMembership", () => {
     livekit_service_url: "a",
   } as UnstableLivekitTransport;
 
+  const mockTransportLocator: livekitAuth.TransportLocator = {
+    transport: mockTransport,
+    serverName: "example.org",
+  };
+
   const connectionTransportAConnected = {
     livekitRoom: mockLivekitRoom({
       localParticipant: {
@@ -320,6 +325,7 @@ describe("LocalMembership", () => {
       livekitState: LivekitConnectionState.Connected,
     }),
     transport: mockTransport,
+    serverName: "example.org",
   } as Connection;
   const connectionTransportAConnecting = {
     ...connectionTransportAConnected,
@@ -360,7 +366,7 @@ describe("LocalMembership", () => {
         ...defaultCreateLocalMemberValues,
         connectionMap$: constant(new Epoch(connectionMap)),
         joinMatrixRTC,
-        localTransport$: constant(mockTransport),
+        localTransport$: constant(mockTransportLocator),
         delayId$,
       });
 
@@ -437,7 +443,7 @@ describe("LocalMembership", () => {
       scope,
       ...defaultCreateLocalMemberValues,
       connectionMap$: constant(new Epoch(connectionMap)),
-      localTransport$: constant(mockTransport),
+      localTransport$: constant(mockTransportLocator),
     });
     await flushPromises();
     expect(publisherFactory).toHaveBeenCalledOnce();
@@ -459,7 +465,7 @@ describe("LocalMembership", () => {
   it("tracks livekit state correctly", async () => {
     const scope = new ObservableScope();
     const connectionMap = new ConnectionMap();
-    const localTransport$ = new Subject<UnstableLivekitTransport>();
+    const localTransport$ = new Subject<livekitAuth.TransportLocator>();
 
     const connectionMap$ = new BehaviorSubject(new Epoch(connectionMap));
     const publishers: Publisher[] = [];
@@ -503,7 +509,7 @@ describe("LocalMembership", () => {
     expect(localMembership.localMemberState$.value).toStrictEqual(
       TransportState.Waiting,
     );
-    localTransport$.next(mockTransport);
+    localTransport$.next(mockTransportLocator);
     await flushPromises();
     expect(localMembership.localMemberState$.value).toStrictEqual({
       matrix: RTCMemberStatus.Connected,
@@ -534,7 +540,7 @@ describe("LocalMembership", () => {
     });
 
     (
-      connectionMap2.getConnectionForTransport(mockTransport)!
+      connectionMap2.getConnectionForTransport(mockTransportLocator)!
         .state$ as BehaviorSubject<ConnectionState>
     ).next({
       state: "authenticated",
@@ -641,7 +647,7 @@ describe("LocalMembership", () => {
           rtsSession$: constant(RTCMemberStatus.Connected),
         },
         connectionMap$: constant(new Epoch(connectionMap)),
-        localTransport$: constant(mockTransport),
+        localTransport$: constant(mockTransportLocator),
       });
 
       await flushPromises();
@@ -676,7 +682,7 @@ describe("LocalMembership", () => {
           rtsSession$: constant(RTCMemberStatus.Connected),
         },
         connectionMap$: constant(new Epoch(connectionMap)),
-        localTransport$: constant(mockTransport),
+        localTransport$: constant(mockTransportLocator),
       });
 
       await flushPromises();
@@ -723,7 +729,7 @@ describe("LocalMembership", () => {
           rtsSession$: constant(RTCMemberStatus.Connected),
         },
         connectionMap$: constant(new Epoch(connectionMap)),
-        localTransport$: constant(mockTransport),
+        localTransport$: constant(mockTransportLocator),
       });
 
       await flushPromises();
@@ -768,7 +774,7 @@ describe("LocalMembership", () => {
           rtsSession$: constant(RTCMemberStatus.Connected),
         },
         connectionMap$: constant(new Epoch(connectionMap)),
-        localTransport$: constant(mockTransport),
+        localTransport$: constant(mockTransportLocator),
       });
 
       await flushPromises();
@@ -832,7 +838,7 @@ describe("LocalMembership", () => {
         scope,
         ...defaultCreateLocalMemberValues,
         connectionMap$: constant(new Epoch(connectionMap)),
-        localTransport$: constant(mockTransport),
+        localTransport$: constant(mockTransportLocator),
       });
       return { scope, localMembership };
     };
@@ -846,6 +852,7 @@ describe("LocalMembership", () => {
           livekitState: LivekitConnectionState.Connected,
         }),
         transport: mockTransport,
+        serverName: "example.org",
         livekitRoom: mockLivekitRoom({
           localParticipant: mockLocalParticipant({
             isScreenShareEnabled: false,