fix(keyboard): correct kitty numpad key code mappings

[eyenalxai]

fix off-by-one error in kitty keyboard protocol numpad key mappings.

according to kitty documentation, the numpad key codes start at 57399 for kp0.

the previous mapping started at 57400, causing all keys to be off by one.
this meant pressing numpad 2 (code 57401) would incorrectly report as kp1.

changes:
shifted all keypad codes down by 1 to match kitty spec.
updated tests with correct key codes.

bun test packages/core/src/lib/parse.keypress-kitty.test.ts passes

[pkg-pr-new]

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commit: 7237c79

[simonklee]

Lgtm

[eyenalxai]

1 tests failed:
(fail) Kitty keyboard keypad keys via keyInput events [21.85ms]

oops missed this one brb