Add labels to nodes

[slimlime]

@seant1 done labels test in feature branch

To be mastermained (merge later)

mindmappy labelled text nodes

hmm what is the value of circle shapes

colour consistency grouping?

replace with spacing and coloured font?

accessibility?

focus on core functionality first before thinking about representations

Oops didn't do the co-author standard properly :( needs space between username and the email string to conform to GitHub standard

[slimlime]

This was intended to be auto-closed in either the smart commit message or when it was finally merged to main branch.