Move scene calculations to OffscreenCanvas

[Abbondanzo]

Issue

The React runtime for calculated.gg is already resource-intensive, and including this viewer increases lag on machines (even semi-decent, performant machines). Using the main thread to perform scene calculations is costly.

Solution

Move the building and calculation of animations to a worker thread. Preferably, move the entire operation to an OffscreenCanvas for supported browsers and measure performance upgrades.