Form validation before submit

[ishaanbuildsthings]

Observed behavior
When the user enters a depth that is too large, based on their computer specifications and the number of moves in the moveset, they have to click solve to view the depth requirement.

Proposed solution
Highlighting the input red and displaying a small error text whenever the depth limits are exceeded could be good. Currently this issue is on pause though as it may not be needed after backend algorithm improvements.