fix(auth): return to guest session on logout

src/stores/chat/__tests__/chat-machine.transitions.test.ts

@@ -164,7 +164,7 @@ function createLoadHistoryCallback(
 }
 
 describe("chatMachine transitions", () => {
-  it("keeps guest logout disabled while allowing upgrade to user login", async () => {
+  it("keeps guest logout disabled and supports user to guest transition", async () => {
     const actor = createActor(createTestChatMachine()).start();
 
     actor.send({ type: "ChatGuestLogin" });
@@ -180,6 +180,22 @@ describe("chatMachine transitions", () => {
       snapshot.matches({ userSession: "ready" }),
     );
 
+    actor.send({ type: "ChatGuestLogin" });
+    await waitFor(actor, (snapshot) =>
+      snapshot.matches({ guestSession: "ready" }),
+    );
+
+    actor.stop();
+  });
+
+  it("allows explicit logout from user session", async () => {
+    const actor = createActor(createTestChatMachine()).start();
+
+    actor.send({ type: "ChatUserLogin", token: "token" });
+    await waitFor(actor, (snapshot) =>
+      snapshot.matches({ userSession: "ready" }),
+    );
+
     actor.send({ type: "ChatLogout" });
     expect(actor.getSnapshot().matches("idle")).toBe(true);
 
@@ -270,7 +286,7 @@ describe("chatMachine transitions", () => {
     actor.stop();
   });
 
-  it("ignores guest login while an authenticated user session is active", async () => {
+  it("switches to guest session when guest login arrives during user session", async () => {
     const actor = createActor(createTestChatMachine()).start();
 
     actor.send({ type: "ChatUserLogin", token: "token" });
@@ -279,7 +295,9 @@ describe("chatMachine transitions", () => {
     );
 
     actor.send({ type: "ChatGuestLogin" });
-    expect(actor.getSnapshot().matches({ userSession: "ready" })).toBe(true);
+    await waitFor(actor, (snapshot) =>
+      snapshot.matches({ guestSession: "ready" }),
+    );
 
     actor.stop();
   });

src/stores/chat/chat-machine.ts

@@ -235,6 +235,10 @@ export const chatMachine = setup({
         },
       ],
       on: {
+        ChatGuestLogin: {
+          target: "#chat.guestSession",
+          actions: "startGuestSession",
+        },
         ChatLogout: {
           target: "#chat.idle",
           actions: "clearChatSession",