fix: Pin Input keyboard nav/replacement

[huntabyte]

WIP
Closes #1869

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[artur-demidov]

Hi. I see you've added tests for this component, cool. I found the problem. There's an error in the algorithm compared to input-otp. If both libraries work the same, then in file pin-input.svelte.ts line 353 should be
direction = c < prev[1] ? "backward" : "forward"; link
and line 360 should be
start = offset + c; link