[@mantine.hook] feat parse-hotkey add normalization for special keys

[Han5991]

fix: #7743

Summary

• Enhanced the parse-hotkey utility to normalize special keys.
• Improved consistency and reliability when handling hotkey parsing.
• Added and updated related tests to cover normalization logic.

Details

• Modified parse-hotkey.ts to include normalization logic for special keys.
• Updated use-hotkeys.test.tsx to ensure correct handling and coverage of new normalization behavior.

[rtivital]

Thanks!