Support for alternative Korean encoding types

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Current Behavior

Monkeytype only expects NFC-encoded (precomposed) Hangul (Korean writing system), and if NFD-encoded (decomposed) Hangul is entered, it is marked as incorrect.

Expected Behavior

NFD-encoded Hangul should be normalized before comparison.

Steps To Reproduce

1. Use an input method which inserts decomposed Hangul Jamo
2. Monkeytype will mark everything entered as incorrect

Environment

• OS: CachyOS (6.18.7-2-cachyos)
• Browser: Firefox
• Browser Version: 147.0.1

Anything else?

https://github.com/user-attachments/assets/eaae606e-8e6d-4e7b-98b4-459fe8d5734f
Confirming the issue is not with input itself, as everything renders correctly in zen mode.

Start by reproducing the issue in Firefox with an input method that inserts decomposed Hangul Jamo, then trace the input comparison path to find where normalization should occur. Done means NFD-encoded Hangul is accepted equivalently to NFC-encoded Hangul, with a regression test covering the comparison.