fix: add missing VHS_VideoCombine widget values

- Add pingpong and save_output boolean parameters
- Add video/h264-mp4 format options: pix_fmt, crf, save_metadata, trim_to_audio
- Fixes "Failed to restore node: Combine Frames" error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

models/comfyui/workflows/advanced/animatediff-video-production-v1.json

@@ -167,7 +167,7 @@
       "order": 9,
       "mode": 0,
       "properties": {"Node name for S&R": "VHS_VideoCombine"},
-      "widgets_values": [8, 0, "animatediff_output", "video/h264-mp4"],
+      "widgets_values": [8, 0, "animatediff_output", "video/h264-mp4", false, true, "yuv420p", 19, true, false],
       "title": "Combine Frames",
       "inputs": [
         {"name": "images", "type": "IMAGE", "link": 12}