FIX: Edges appending to only one instance of Svelvet container #513

[turizspace]

• Updated moveEdge function in Edge.svelte to correctly append the edge element to its respective Svelvet container based on containerId.

🔗 Linked issue

Resolves #513

Description

• Enhanced moveEdge function in Edge.svelte to ensure proper appending of edge elements to their respective Svelvet containers.
• Previous implementation relied on static container selection, causing edges to append inconsistently across multiple Svelvet instances.
• Refactored moveEdge to dynamically fetch the container using containerId, ensuring edges are appended to the correct instance based on context.
• This change resolves visual inconsistencies and improves the reliability of edge rendering in complex Svelvet applications.

Checklist

• I've followed the Contributing guidelines

• I've titled my PR according to the Conventional Commits spec

• I've linked an open issue

• I've linted and tested my code