[FR] When splines/lines between nodes are "hidden" - Option to "unhide splines/lines to selected nodes"

### Is there an existing issue for this?

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

### What problem are you experiencing?

Checking to see if the links are connected to the correct node. In large workflows this task is difficult to visualize if there are lots of links.

Example of the workflow I thought about this feature request.

### When does this problem occur?

One of my sub-processors that is optional for the workflow to run, didn't work. There was no error to the workflow it just stopped as if it completed. The issue was, it was not connected to the right nodes.

### How often do you encounter this problem?

Multiple times per day

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

Significantly slows down my work

### Current workarounds

There is no real work around other them moving the nodes back and forth a little to give you just a very small increase in easiness to track where the connection goes.

### Ideas for solutions (Optional)

This is not a problem or error but could be a significant quality of life improvement.

The idea is to have an option for "Unhide Lines on Selected Nodes" So when all the lines are hidden, when you select a node, it unhides just the selected nodes connections. Allowing you to easily track which node is connected to which node without having to move them around to see the connections.

Quick example of this would be these images. Imagine all the link lines are connections are set to be hidden.

You select the KSampler node and it shows this.

Or you select the VAE Decoder

Or you select multiple nodes... (I selected the Positive Node and VAE Decode Node

### Additional context

At the moment there is either all or none, this is a simple but I would say likely highly effective and huge QoL improvement to the UI. I would very much like this to be included, however, it needs to be a toggleable option for those that never want to see the links.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-7418-FR-When-splines-lines-between-nodes-are-hidden-Option-to-unhide-splines-lines-t-2c76d73d3650814e96c0e6ccbf927e0c) by [Unito](https://www.unito.io)