Improve consistency on bucket hovering and focusing
On #4069, we introduced a small improvement when hovering a left-pointed bucket: focus the corresponding annotation card, in addition to the anchor's highlight. In this PR, we introduce the same improvement to the up and down-pointed buckets. In addition, I have realised we handled `onBlur` but not `onFocus` events. I have added more complete support for keyboard navigation. I substituted `onMouseMove` for `onMouseEnter` because it is triggered less frequently.
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