Fix highlight clicks that never scrolled the matching comment card

[qqlabs]

Summary

• Clicking a painted quote now keeps working after in-iframe navigation (the annotate client would stay in experience mode and swallow the click).
• Revealing the matching rail card waits until it is laid out, then jumps the comments scroller to the top of the panel instead of a slow centered smooth-scroll.
• The revealed card gets a short amber ring so it is obvious in a long resolved list.

notsuhas/postplan has issues disabled, so there is no issue to link. This is the same viewer/rail fix that landed on the qqlabs instance as #6 / #10 / #11 / plivo-labs#12 / plivo-labs#13, squashed onto current upstream/main.

Test plan

• Open a page with many resolved comments, Comments rail open, click a highlighted quote that is not at the top of the rail.
• Confirm the matching card jumps to the top of the side panel with a ring (not a long smooth scroll, not a different nearby card).
• Navigate inside the iframe to another page on the same site, then click a highlight: the rail should still reveal that thread.
• Click the same highlight twice: it should still scroll/emphasize on the second click.

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