fix(youtube): retry without cookies on any yt-dlp failure, not just cookie-worded errors

YouTube's SABR-only streaming rollout produces errors like "Signature
solving failed" / "Requested format is not available" that don't
mention cookies, so the existing no-cookies fallback never triggered.
Cookies also disable the android client, which is often the only one
still returning usable formats under this restriction.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

youtube-downloader/app.py

@@ -405,9 +405,11 @@ def download_youtube_video(url: str, max_retries: int = 3, format_id: str | None
         stderr = result.stderr.strip()[-800:]
         logger.error(f"[DOWNLOAD] Попытка {attempt + 1}: yt-dlp failed: {stderr[:300]}")
 
-        # Try without cookies on cookies-related errors
-        if ('cookies' in stderr.lower() or 'bot' in stderr.lower() or 'sign in' in stderr.lower()) \
-                and '--cookies' in ' '.join(cmd):
+        # Пробуем без cookies при любой ошибке, а не только по ключевым словам:
+        # cookies отключают клиент "android" (см. "does not support cookies"),
+        # который часто остаётся единственным, кто отдаёт форматы при SABR-only
+        # ограничениях YouTube — так что без cookies шанс скачать выше почти всегда.
+        if '--cookies' in ' '.join(cmd):
             logger.warning("[DOWNLOAD] Пробуем без cookies")
             cmd_no_cookies = [a for i, a in enumerate(cmd) if a != '--cookies' and cmd[i-1] != '--cookies']
             try: