feat: Variable click jumps to source node

[wellCh4n]

Summary

In the case of too many nodes, finding the source node from the variable is very difficult, after the change, you can move the node to the center of the workflow canvas by clicking while holding down the command or ctrl

Close https://github.com/langgenius/dify/issues/13638

Screenshots

Before	After
No

Checklist

[!IMPORTANT]
Please review the checklist below before submitting your pull request.

• [x] This change requires a documentation update, included: Dify Document
• [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [x] I've updated the documentation accordingly.
• [x] I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[wellCh4n]

#13638