Number Shortcuts for the Next Moves

[psygo]

On AI Sensei, you can navigate through the next suggested moves through the keyboard, for example, you can use a to move to its suggested blue move, or b to the second suggestion, and so on. Since KaTrain already uses a bunch of letters for shortcuts, maybe it could use numbers instead. How about 1 for the first suggested move and so on?

[github-actions]

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