* fix(web): remove duplicate emoji button on parent comment card
The parent CommentCard rendered two emoji pickers: one in the header
toolbar (QuickEmojiPicker) and another inside ReactionBar (which has
its own QuickEmojiPicker when hideAddButton is not set). Added
hideAddButton to the parent's ReactionBar, matching the pattern
already used in CommentRow for replies.
* fix(web): show emoji button at bottom for long comments
For short comments, the emoji picker only appears in the top-right
toolbar. For long comments (>500 chars or >8 newlines), the ReactionBar
also shows an add button at the bottom so users don't have to scroll
back up to add reactions.
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