Restart stale GUI and avoid port 8765 clash with fileShare

Old juc500_app processes kept serving pre-fix code; start.sh now
kills them and GUI defaults to port 8766.

Co-authored-by: Cursor <cursoragent@cursor.com>

juc500_xfer/__init__.py

@@ -1,3 +1,3 @@
 """JUC500 cross-platform file transfer for Apple Silicon Mac ↔ Windows 11."""
 
-__version__ = "0.1.0"
+__version__ = "0.1.1"

juc500_xfer/gui_server.py

@@ -19,7 +19,7 @@ from .protocol import Session
 from .usb_link import Juc500Link, list_devices, doctor
 from .wormhole_kill import kill_wormhole_processes, wormhole_status
 
-DEFAULT_GUI_PORT = 8765
+DEFAULT_GUI_PORT = 8766  # 8765는 fileShare 등과 자주 충돌
 
 
 def _static_root() -> Path:
@@ -673,8 +673,14 @@ def run_gui(open_browser: bool = True, port: int | None = None, host: str = "127
         print(f"Wormhole 자동 종료 건너뜀: {exc}")
     server = ThreadingHTTPServer((host, listen_port), Handler)
     url = f"http://{host}:{listen_port}/"
-    print(f"JUC500 GUI: {url}")
+    from . import __version__
+    from .usb_link import Juc500Link
+
+    backend = hasattr(Juc500Link, "_backend_bulk_write")
+    print(f"JUC500 GUI v{__version__} (backend_io={backend}): {url}")
     print("fileShare와 동일한 듀얼 패널 UI · 케이블 연결 후 「연결」을 누르세요.")
+    if listen_port != preferred:
+        print(f"주의: 기본 포트 {preferred} 사용 중 → {listen_port} 으로 열었습니다. 브라우저 주소를 확인하세요.")
     if open_browser:
         threading.Timer(0.4, lambda: webbrowser.open(url)).start()
     try: