Fix yt-dlp file creation and clean video pipeline

src/media_processor.py

@@ -6,6 +6,7 @@ import os
 import sys
 import tempfile
 import time
+import uuid
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Any, Optional, Set
@@ -101,12 +102,7 @@ class MediaProcessor:
         self, url: str, prefix: str = "video_"
     ) -> tuple[Optional[Path], Optional[str], bool]:
         """Returns (path, error_message, is_permanent_error)"""
-        tmp = tempfile.NamedTemporaryFile(
+        output_path = self.cache_dir / f"{prefix}{uuid.uuid4().hex[:12]}.mp4"
-            dir=self.cache_dir, prefix=prefix, suffix=".mp4", delete=False
-        )
-        output_path = Path(tmp.name)
-        tmp.close()
-
         await register_active_path(output_path)
         max_size = self.max_video_bytes
         netrc_path = None