Tunnel node

The tunnel sender node sends whatever you connect to it to all the tunnel receiver nodes with the same key. Here's how it works in Pixel Composer:

https://github.com/user-attachments/assets/90bdaa8c-a962-4837-9932-26656be1038f

It helps a lot when trying to manage a lot of long and crossing connections, like this:

Some improvements to Pixel Composer's implementation can be made, such as making the tunnel receiver node use a combo box dropdown menu that's automatically populated from all the senders' keys.

The issue does not name files, tests, or an entry point. Start by locating the existing tunnel sender and receiver node implementation, then determine how receiver keys are currently selected. Done means receiver nodes offer a combo box populated from the available sender keys.

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