- Merge the comments side-panel header into the Open/Resolved tab row,
then drop the now-redundant "Comments" title; the panel keeps its
accessible name via the AppShell.Aside aria-label.
- Overlay the close (X) button on the right of the tab row and nudge it
up 4px to align with the tab labels; the tab list stays full-width so
its bottom border line is preserved. The toc/details tabs keep their
existing shared header and scroll area unchanged.
- Quote block (.textSelection): increase top margin (2px -> 8px) so it
no longer sticks to the timestamp when it is the first block, and add
margin-left: 6px so the quote's left bar lines up with the comment
body text left edge.
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