fix: Prevent permission request from stealing focus across cells

[charlesvien]

Problem

ActionSelector unconditionally auto-focuses on mount, stealing focus from the active cell's editor when a permission request arrives in another command center cell.

Closes #1503

Changes

1. Add isUserInInteractiveElement() guard to skip auto-focus when user is in an input/editor
2. Add autoFocus option to restoreStepAnswer to conditionally skip its focus call on mount
3. Guard both mount-time focus paths so only idle panels auto-focus

How did you test this?

Manually

[charlesvien]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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