fix(steps): trigger click handlers from keyboard activation

[aibayanyu20]

Summary

• activate clickable steps with Enter and Space
• route keyboard activation through the native click path so item and parent callbacks stay consistent
• prevent the default Space scrolling behavior

Upstream

• fix: preserve item click on keyboard activation react-component/steps#395

Verification

• targeted keyboard regression test passed
• lint passed

Note: the package full suite has pre-existing snapshot and DOM selector failures on next; snapshots were intentionally not rewritten in this PR.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Ignore bubbled keyboard events from nested controls

When a clickable step's title or content contains an input, link, or button, its Space/Enter keydown bubbles to this handler. Calling preventDefault() then blocks the nested control's behavior—for example, Space can no longer be typed into an input and Enter cannot activate a link—while currentTarget.click() activates the entire step instead. Only synthesize the step click when the step element itself is the event target, or otherwise exclude key events originating from nested interactive elements.

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