Fix Windows player: kiosk lockdown, robust video transitions, keep-awake

- Production/kiosk mode: exit_on_escape=0, window-close guard, Ctrl+C
  ignore, Alt+F4/Alt+Tab/Win/Ctrl+Esc keyboard hook (Windows)
- Robust video playback: async (non-blocking) ffpyplayer teardown,
  video progress watchdog (advance at true clip end), EOS re-entrancy
  guard, stale-advance guard, focus keeper for foreground retention
- Resume playback timer after Settings/exit popups close
- Windows keep-awake: SetThreadExecutionState + disable screensaver/
  lock screen (restored on exit)
- Always-on playback_trace.log for diagnosing transitions
- exe metadata: app_icon.ico + version_info.txt (publisher identity)

windows/build.spec

@@ -285,7 +285,8 @@ exe = EXE(
     target_arch=None,
     codesign_identity=None,
     entitlements_file=None,
-    icon=str(RESOURCES_DIR / 'app_icon.ico') if (RESOURCES_DIR / 'app_icon.ico').exists() else None,
+    icon=str(BUILD_DIR / 'app_icon.ico') if (BUILD_DIR / 'app_icon.ico').exists() else None,
+    version=str(BUILD_DIR / 'version_info.txt') if (BUILD_DIR / 'version_info.txt').exists() else None,
 )
 
 # --- COLLECT everything into a single folder -------------------------