fix(web): allow collapsing the settled threads tail

[marcoamt]

What Changed

• Added a way to collapse the settled threads list back after expanding it with "Show N more".
• A small undo icon next to "Show N more" collapses back to the initial list; once fully expanded, the button itself becomes "Show less".

Why

The settled threads list shows the first 10 threads with a "Show 25 more" button, but there was no way to collapse it back once expanded. This adds a small, reversible affordance consistent with the existing un-settle icon pattern, without adding an extra row to the sidebar.

UI Changes

Before: the settled tail paging row only offers "Show 25 more" — no way back once expanded.

After: hovering the paging row reveals a rollback icon aligned with the thread rows' un-settle affordance, letting you collapse back to the initial page.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Implemented with Claude Sonnet 5 in Claude Code.

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Note

Low Risk
Sidebar-only UI and local settledVisibleCount state; no API, auth, or data changes.

Overview
Adds Show less for the settled threads tail so expanding with Show N more is reversible, without an extra sidebar row.

Paging logic now tracks the active route thread via settledRouteThreadIndex, and uses settledFloorVisibleCount / settledIsExpanded so collapse only appears when it would actually hide rows (including when a deep-linked thread stays pinned visible). The paging row shows Show more while hidden threads remain; when fully expanded it becomes Show less, and while more pages exist a hover undo icon on the same row collapses back to the initial page—aligned with settled rows’ un-settle affordance.

^{Reviewed by Cursor Bugbot for commit 77178e0. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Allow collapsing the settled threads list in the sidebar

• Adds a 'Show less' button to the settled threads section in Sidebar.tsx that resets the visible count back to the initial page size.
• While partially expanded (more items hidden), a secondary 'Show less' control appears on hover/focus at the right side of the paging row.
• The collapse action is suppressed when the currently routed thread is beyond the initial page and collapsing would be a no-op due to that thread being pinned visible.

^{Macroscope summarized 77178e0.}

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[macroscopeapp]

Approvability

Verdict: Approved 77178e0

This PR adds a 'Show less' button to collapse expanded settled threads in the sidebar - a minor UI enhancement complementing the existing 'Show more' feature. The changes are self-contained within the Sidebar component with no impact beyond the UI affordance.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 74d92d3. Configure here.}

Dismissing prior approval to re-evaluate 77178e0