v2.2.2: dummy release for auto-update test

- Show app version in window title for visual confirmation after update
- No functional changes — purely a test bump to verify the
  single-file (main.exe alone) auto-update flow end-to-end.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/main_window.py

@@ -176,7 +176,8 @@ class MainWindow(QMainWindow):
 
     def init_ui(self):
         """UI 초기화"""
-        self.setWindowTitle("⏰ " + tr('window.main_title'))
+        from core.version import __version__
+        self.setWindowTitle(f"⏰ {tr('window.main_title')} v{__version__}")
         self.setGeometry(100, 100, 500, 620)
         self.setMinimumSize(480, 520)