Added function: You can export the "Favorite" node for easy import in the new comfyui

### What problem are you experiencing?

I have collected a lot of nodes in the old comfyui, and it is troublesome to re-collect nodes in the new comfyui. Added function: You can export the "Favorite" node for easy import in the new comfyui

### When does this problem occur?

.

### How often do you encounter this problem?

Multiple times per day

### How much does this problem affect your workflow?

Blocks me from completing tasks

### Current workarounds

.

### Ideas for solutions (Optional)

_No response_

### Additional context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-10989-Added-function-You-can-export-the-Favorite-node-for-easy-import-in-the-new-comfyui-33d6d73d365081a28bbde58d8e739b31) by [Unito](https://www.unito.io)

No files, tests, or entry points are named. Start by locating the existing Favorite-node state and the new ComfyUI import flow, then clarify the export format and compatibility expectations; done means favorites can be exported from the old frontend and imported into the new one without re-collecting them.

Written by the indexing model from the issue text.