Fix cursor freeze with modifier keys

[sedghi]

Prevent preventDefault() for modifier-only keys to fix mouse cursor freezing when modifiers are pressed.

Previously, evt.preventDefault() was called indiscriminately for all keydown events, including modifier keys. This blocked the browser's default handling of these keys, which interfered with mouse movement events, causing the cursor to stop responding. This change ensures that only non-modifier keys have their default behavior prevented, allowing modifier keys to function correctly alongside mouse interactions.

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Linear Issue: OHI-1994

 

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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