Log track encryption flag and cryptor events for remote tracks

Extends the [RemoteTracks] logging from #4235 with the per-publication
encryption flag and the ParticipantEncryptionStatusChanged /
EncryptionError room events.

If a publisher encrypts frames while the subscriber believes the
publication is unencrypted, livekit-client bypasses the cryptor and hands
raw ciphertext to the decoder, which is audible as loud noise bursts.
The reverse mismatch (or a missing/invalid key) drops frames instead.
Neither case is visible in a rageshake today.

src/state/CallViewModel/remoteMembers/Connection.test.ts

@@ -516,11 +516,12 @@ describe("remote track logging", () => {
   it("logs remote participant and track events on the connection logger", () => {
     setupTest();
     const info = vi.fn();
+    const warn = vi.fn();
     const testLogger = {
       getChild: (): unknown => testLogger,
       info,
       debug: vi.fn(),
-      warn: vi.fn(),
+      warn,
       error: vi.fn(),
     } as unknown as Logger;
     new Connection(
@@ -545,6 +546,7 @@ describe("remote track logging", () => {
       source: "microphone",
       trackSid: "TR_mic",
       isMuted: false,
+      isEncrypted: true,
     } as unknown as RemoteTrackPublication;
     const messages = (): string[] => info.mock.calls.map((c) => c[0] as string);
 
@@ -564,11 +566,27 @@ describe("remote track logging", () => {
     );
     expect(messages()).toEqual([
       "Participant connected: @bob:example.org:DEV111 (PA_bob)",
-      "Subscribed: audio microphone TR_mic of @bob:example.org:DEV111 muted=false",
-      "Muted: audio microphone TR_mic of @bob:example.org:DEV111",
-      "Stream paused: audio microphone TR_mic of @bob:example.org:DEV111",
+      "Subscribed: audio microphone TR_mic of @bob:example.org:DEV111 encrypted=true muted=false",
+      "Muted: audio microphone TR_mic of @bob:example.org:DEV111 encrypted=true",
+      "Stream paused: audio microphone TR_mic of @bob:example.org:DEV111 encrypted=true",
     ]);
 
+    // Encryption status changes are logged; cryptor errors are warnings
+    fakeLivekitRoom.emit(
+      RoomEvent.ParticipantEncryptionStatusChanged,
+      false,
+      bob,
+    );
+    expect(messages().at(-1)).toBe(
+      "Encryption status of @bob:example.org:DEV111: encrypted=false",
+    );
+    const cryptorError = new Error("missing key at index 3");
+    fakeLivekitRoom.emit(RoomEvent.EncryptionError, cryptorError, bob);
+    expect(warn).toHaveBeenCalledWith(
+      "Encryption error for @bob:example.org:DEV111:",
+      cryptorError,
+    );
+
     // Local mute events are already logged by the Publisher
     fakeLivekitRoom.emit(RoomEvent.TrackMuted, pub, {
       ...fakeLocalParticipant,