[bug] Inconsistent horizontal alignment

[kvid]

Single-line connector attributes are centered horizontally in the diagram when smaller than the available space, but the graphviz_line_breaks() function makes multi-line attributes left aligned:
https://github.com/formatc1702/WireViz/blob/34cd9c26126231eeb25f93af245b0a24e8d45ed8/src/wireviz/wv_helper.py#L120

In the wire nodes (formatted with HTML), both single- and multi-line attributes are centered.

[kvid]

Some users might argue that they prefer left-aligned multi-line attributes. IMHO, that would be a new optional feature request.

[formatc1702]

I intentionally used \l because I thought it would look better (thus the comment, since \l is quite unusual), but you are right, centered looks more consistent. I'll think about adding alignment options later, but it's not a priority.