Fix possible role relation a11y issues in transcript display #821
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Remove
radiogroup/radiorole relationship introduced in #820 for transcript cues as this could introduce role relationship errors similar to annotations component (#811) in the future. E.g. cues with links embedded in them could lead to a break in accessibility as they are presented within a parent container which has therole="radio".Changes included in the PR:
role="button", therefore only highlighting the timestamp on hover events