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:

start.sh

@@ -27,4 +27,23 @@ if ! "$PY" -c "import usb" 2>/dev/null; then
   exit 1
 fi
 
+# 이전 GUI 인스턴스 종료 (옛 코드가 포트 8765를 붙잡고 있으면 같은 에러가 반복됨)
+if command -v pgrep >/dev/null 2>&1; then
+  OLD_PIDS="$(pgrep -f "$ROOT/juc500_app.py" || true)"
+  if [[ -n "${OLD_PIDS}" ]]; then
+    echo "이전 JUC500 프로세스 종료: ${OLD_PIDS}"
+    # shellcheck disable=SC2086
+    kill ${OLD_PIDS} 2>/dev/null || true
+    sleep 0.4
+    # shellcheck disable=SC2086
+    kill -9 ${OLD_PIDS} 2>/dev/null || true
+  fi
+fi
+
+# 캐시된 .pyc 가 헷갈리지 않도록 (경량)
+rm -rf "$ROOT/juc500_xfer/__pycache__" 2>/dev/null || true
+
+REV="$("$PY" -c "from juc500_xfer import __version__; from juc500_xfer.usb_link import Juc500Link; print(__version__, 'backend_io=' + str(hasattr(Juc500Link, '_backend_bulk_write')))")"
+echo "JUC500 start — ${REV}"
+
 exec "$PY" "$ROOT/juc500_app.py" "$@"