FEAT: Download image graph

[Caussz]

Create and Download Graph Image

Description:

This task involves creating an image of the current graph visualization and providing functionality for users to download the image. The implementation should ensure that the graph is accurately captured and downloadable in a user-friendly format.

Checklist:

• Implement functionality to capture the current state of the graph as an image.
• Provide a button or link for users to download the captured image.
• Ensure the image captures all visible nodes and edges accurately.
• Support common image formats such as PNG and JPEG for the download.