fix: Prevent token race conditions by pre-saving access/refresh tokens to localStorage before NextAuth signIn and refining logout token clearing.

src/components/providers/session-provider.tsx

@@ -39,9 +39,14 @@ function TokenSync() {
         hasInitialized.current = true;
       }
     } else if (status === "unauthenticated") {
-      // Clear tokens when logged out
-      localStorage.removeItem("accessToken");
-      localStorage.removeItem("refreshToken");
+      // Only clear tokens if a logout is explicitly in progress.
+      // Don't clear during normal page loads or brief unauthenticated flickers,
+      // as the login page saves tokens to localStorage before signIn completes.
+      const loggingOut = localStorage.getItem("isLoggingOut") === "true";
+      if (loggingOut) {
+        localStorage.removeItem("accessToken");
+        localStorage.removeItem("refreshToken");
+      }
       hasInitialized.current = false;
     }
   }, [session, status]);