Fix checkbox enter key activation

[tmrr13]

Fix checkbox not activating with Enter/Space keys by moving keyboard event handlers to the input element.

The original implementation placed keyboard event listeners on the <label> element, but when a user tabs to a checkbox, the focus is typically on the <input> element. This prevented the checkbox from responding to Enter or Space key presses, impacting keyboard accessibility. Moving these handlers directly to the <input> resolves this issue.

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[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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