Fix reconnect stale keys and TUI status rendering

tests/integration_smoke.rs

@@ -620,6 +620,48 @@ fn disconnected_client_times_out_and_gets_reject() {
     assert_eq!(reject.reason, "unknown client");
 }
 
+#[test]
+fn known_client_with_stale_key_id_gets_reject_not_timeout() {
+    let dir = tempfile::tempdir().unwrap();
+    let port = free_udp_port();
+    let config = write_server_config(&dir, port);
+    let mut server = start_server(&dir, &config);
+    let (_bootstrap, ok) = {
+        let (_socket, bootstrap, ok) = direct_attach(&config, port, "read-write");
+        (bootstrap, ok)
+    };
+    let socket = UdpSocket::bind("127.0.0.1:0").unwrap();
+    socket
+        .set_read_timeout(Some(Duration::from_secs(2)))
+        .unwrap();
+    let stale_key = crypto::random_32();
+    let packet = protocol::encode_encrypted(
+        PacketKind::Ping,
+        ok.client_id,
+        99,
+        0,
+        &stale_key,
+        CLIENT_TO_SERVER,
+        b"",
+    )
+    .unwrap();
+
+    socket
+        .send_to(&packet, format!("127.0.0.1:{port}"))
+        .unwrap();
+    let mut buf = [0u8; 65535];
+    let (n, _) = socket.recv_from(&mut buf).unwrap();
+    let packet = protocol::decode(&buf[..n]).unwrap();
+    let reject: AttachReject = protocol::from_body(&packet.body).unwrap();
+
+    let _ = server.kill();
+    let _ = server.wait();
+
+    assert_eq!(packet.header.kind, PacketKind::AttachReject);
+    assert_eq!(packet.header.conn_id, ok.client_id);
+    assert_eq!(reject.reason, "unknown client");
+}
+
 #[test]
 fn local_attach_only_smoke() {
     let dir = tempfile::tempdir().unwrap();
@@ -1525,8 +1567,8 @@ fn resume_snapshot_preserves_alternate_screen_mode() {
 
     assert!(resume_frame.snapshot);
     assert!(
-        resume_frame.bytes.starts_with(b"\x1b[?1049h"),
-        "snapshot did not enter alternate screen first: {:?}",
+        resume_frame.bytes.starts_with(b"\x1b[?1049h\x1b[H\x1b[2J"),
+        "snapshot did not enter and clear alternate screen first: {:?}",
         String::from_utf8_lossy(&resume_frame.bytes)
     );
 }