Time gaps:
- Insert a horizontal divider with duration label ("12m later",
"1h 30m later") between consecutive visible messages separated
by more than 5 minutes
- Computed during the display list build pass alongside redacted
dividers, so no additional traversal is needed
Hash anchor navigation:
- Each message div now has id="msg-{uuid}" for deep linking
- On load, if the URL contains a #msg-* hash, scroll that message
into view with smooth centering and a 3-second highlight ring
- Works with the copy-link feature added to MessageBubble headers
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
teernisse
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