💄 UI improvement: frontend lags visibly for larger N

[Blargian]

Frontend rendering visibly lags for larger numbers of N. I think this has to do with the silly way I wrote the playback functionality. I am storing all nodes for every iteration. Rather just the latest additions should be added to successive solving snapshots and the drawing algorithm should do the work of drawing only the changes (rather than everything from scratch each time). This will be a lot less computationally heavy, especially considering I loop through multiple arrays.

• Refactor solving snapshots
• Add drawing to its own thread