chore(ext): rm keydown event on history

[gaomeng1900]

What

ATT

Type

• Bug fix
• Feature / Improvement
• Refactor
• Documentation
• Website
• Demo / Testing
• Breaking change

Requirements / 要求

• I have read and follow the Code of Conduct and Contributing Guide . / 我已阅读并遵守行为准则。
• This PR is NOT generated by a bot or AI agent acting autonomously. I have authored or meaningfully reviewed every change. / 此 PR 不是由 bot 或 AI 自主生成的，我已亲自编写或充分审查了每一处变更。

[Copilot]

Pull request overview

Removes the keyboard keydown handler from the History list item interaction.

Changes:

• Removed onKeyDown handling for Enter/Space activation on history items.

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[Copilot]

Removing the onKeyDown handler breaks keyboard activation for an element using role=\"button\" + tabIndex={0} (Enter/Space will no longer trigger selection). To keep this accessible, either restore the Enter/Space key handling, or change the element to a semantic <button type=\"button\"> (and then you can drop role/tabIndex and rely on native keyboard behavior).

Suggested change

	onClick={() => onSelect(session.id)}
	onClick={() => onSelect(session.id)}
	onKeyDown={(event) => {
	if (event.key === 'Enter' || event.key === ' ') {
	event.preventDefault()
	onSelect(session.id)
	}
	}}