[Feature request] Estimated Total Knowledge over time

Turns out ts-fsrs is cool as hell

The addon is a buggy mess right now but this is what you wanted right?

Right now it re-simulates difficulty, which given the current parameters are going to be most accurate is a good thing? Reviews are still actually reviewed at the same time so if anything the difficulty should be more accurate and I shouldent update it to the historical difficulty on every review (?!?)

Relevent code:

Self pr:

The graph is at the very bottom right of revlog reviews if you build that branch.