[Feature Request]: Open save dialog

### Is there an existing issue for this?

- [x] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

As a user of the Blender node system, I appreciate its intuitive loading and saving mechanism. I propose that a similar functionality be implemented for loading images and accessing the open/save dialog within the GitHub platform. Specifically, I suggest adding a folder icon that would enable users to select files from their local disk. Currently, the system only supports input folders or manual path entry via plugins.
For reference, I am attaching a screenshot of the Blender node system, which demonstrates how this functionality works. The screenshot shows the "Load Image" node with an open/save dialog that allows users to select a file from their disk.

### Proposed workflow


### Additional information

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-2943-Feature-Request-Open-save-dialog-1b16d73d3650810787f5c534581269f9) by [Unito](https://www.unito.io)