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)

src/playback_trace.py

@@ -0,0 +1,64 @@
+"""
+playback_trace.py — Always-on playback transition logger.
+
+Kivy's log level is forced to 'warning' in main.py / run_win.py, which
+suppresses every Logger.info()/Logger.debug() line. That made it impossible
+to see why the player skips/crashes at the weblink->image and video->next
+transitions.
+
+This module writes a plain-text trace file (logs/playback_trace.log) with
+timestamps, INDEPENDENT of Kivy's log level, so we can always see exactly
+what the player is doing. It is thread-safe (a lock guards the append) and
+never throws (all failures are swallowed) so it can never break playback.
+
+Usage:
+    from playback_trace import trace
+    trace("play_current_media", index=3, name="foo.jpg", type="image")
+"""
+
+import os
+import threading
+import time
+
+_LOCK = threading.Lock()
+_LOG_PATH = None
+_OPENED = False
+
+
+def _ensure_path():
+    global _LOG_PATH, _OPENED
+    if _OPENED:
+        return _LOG_PATH
+    _OPENED = True
+    try:
+        # Respect the local data dir the launcher set (same place as logs/).
+        base = os.environ.get('KIWY_DATA_DIR') or os.getcwd()
+        log_dir = os.path.join(base, 'logs')
+        os.makedirs(log_dir, exist_ok=True)
+        _LOG_PATH = os.path.join(log_dir, 'playback_trace.log')
+    except Exception:
+        _LOG_PATH = None
+    return _LOG_PATH
+
+
+def trace(event, **kwargs):
+    """Append one line to the playback trace log.
+
+    Args:
+        event: short event name, e.g. 'next_media', 'eos', 'web_open'.
+        **kwargs: key=value context, e.g. index=3, name='foo.jpg'.
+    """
+    try:
+        path = _ensure_path()
+        if not path:
+            return
+        t = time.strftime('%H:%M:%S')
+        ms = int((time.time() % 1) * 1000)
+        parts = [f"{t}.{ms:03d}", event]
+        for k, v in kwargs.items():
+            parts.append(f"{k}={v}")
+        with _LOCK:
+            with open(path, 'a', encoding='utf-8') as f:
+                f.write(" ".join(parts) + "\n")
+    except Exception:
+        pass  # tracing must never break the player