- Added username persistence via localStorage with read-only input behavior.

- Added automatic connect() invocation on page load.
- Implemented robust login flow: register or auto-login based on local flags.
- Added logout support with clean WebSocket disconnect + state reset.
- Updated NakamaProvider with getSession(), autoLogin(), registerWithUsername().
- Connected logout button and integrated updated login behavior into UI.

src/tictactoe/providers/NakamaProvider.tsx

@@ -32,6 +32,7 @@ export interface NakamaContextType {
   matchId: string | null;
 
   loginOrRegister(username: string): Promise<void>;
+  logout(): Promise<void>;
   joinMatchmaker(mode: string): Promise<string>;
   joinMatch(matchId: string): Promise<void>;
 
@@ -55,17 +56,63 @@ export function NakamaProvider({ children }: { children: React.ReactNode }) {
   const lastModeRef = React.useRef<string | null>(null);
   const socketRef = React.useRef<Socket | null>(null);
 
+  async function autoLogin() {
+    const deviceId = getOrCreateDeviceId();
+
+    try {
+      return await client.authenticateDevice(
+        deviceId,
+        false
+      );
+    } catch (e) {
+      // fallback: treat as new user
+      localStorage.removeItem("registered");
+      throw e;
+    }
+  }
+
+  async function registerWithUsername(username: string) {
+    const deviceId = getOrCreateDeviceId();
+
+    // create + set username
+    const session = await client.authenticateDevice(
+      deviceId,
+      true,
+      username
+    );
+
+    // mark an account as registered
+    localStorage.setItem("registered", "yes");
+    localStorage.setItem("username", username);
+
+    return session;
+  }
+
+  async function getSession(username?: string) {
+    const isRegistered = localStorage.getItem("registered") === "yes";
+    if (!username && !isRegistered) {
+      throw new Error("No username provided and not registered");
+    }
+
+    let newSession;
+    if (!isRegistered) {
+      newSession = await registerWithUsername(username ?? "");
+    } else {
+      newSession = await autoLogin();
+    }
+
+    return newSession;
+  }
+
   // ----------------------------------------------------
   // LOGIN
   // ----------------------------------------------------
-  async function loginOrRegister(username: string) {
-    const deviceId = getOrCreateDeviceId();
-
+  async function loginOrRegister(username?: string) {
     // authenticate user
-    const newSession = await client.authenticateDevice(deviceId, true, username);
+    const newSession = await getSession(username);
     setSession(newSession);
 
-    // create socket (new Nakama 3.x signature)
+    // create a socket (new Nakama 3.x signature)
     const s = client.createSocket(undefined, undefined); // no SSL on localhost
     await s.connect(newSession, true);
     setSocket(s);
@@ -102,6 +149,25 @@ export function NakamaProvider({ children }: { children: React.ReactNode }) {
     };
   }
 
+  async function logout() {
+    try {
+      // 1) Disconnect socket if present
+      if (socketRef.current) {
+        socketRef.current.disconnect(true);
+        console.log("[Nakama] WebSocket disconnected");
+      }
+    } catch (err) {
+      console.warn("[Nakama] Error while disconnecting socket:", err);
+    }
+
+    // 2) Clear state
+    setSocket(null);
+    socketRef.current = null;
+    setSession(null);
+
+    console.log("[Nakama] Clean logout completed");
+  }
+
   // ----------------------------------------------------
   // MATCHMAKING
   // ----------------------------------------------------
@@ -187,6 +253,7 @@ export function NakamaProvider({ children }: { children: React.ReactNode }) {
         socket,
         matchId,
         loginOrRegister,
+        logout,
         joinMatchmaker,
         joinMatch,
         sendMatchData,