fix(web): work log Show more — cursor, transition & scroll

[Marve10s]

Summary

• Cursor pointer: The "Show more" button in work log / tool call groups was missing cursor-pointer, showing a default arrow on hover instead of a hand. Fixed by switching to the existing CollapsibleTrigger component which includes it.
• Smooth transition: Replaced the instant show/hide with the existing Base UI Collapsible + CollapsiblePanel component, giving a smooth 200ms height animation when expanding/collapsing overflow entries.
• No auto-scroll on expand: Expanding a work log group during a running session would yank the viewport to the bottom via scheduleStickToBottom. Now disables auto-scroll on toggle so the user stays where they clicked; the scroll-to-bottom button appears if they want to jump back.

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Note

Low Risk
UI-only change to work log expand/collapse behavior plus a small test; minimal risk beyond potential minor rendering/interaction regressions.

Overview
Improves work log/tool-call group expansion in MessagesTimeline by switching the overflow UI to the shared Collapsible components, enabling the built-in cursor styling and smooth height transition.

Work entries are now split into always-visible vs overflow sections (with overflow kept mounted inside CollapsiblePanel), and the expand/collapse control is marked with data-scroll-anchor-ignore to avoid interfering with scroll anchoring.

Adds a regression test ensuring the "Show N more" control renders and includes the scroll-anchor ignore attribute.

^{Reviewed by Cursor Bugbot for commit 557faca. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix work log 'Show more' cursor, transition, and scroll anchor in WorkGroupSection

• Refactors WorkGroupSection in MessagesTimeline.tsx to use Collapsible/CollapsibleTrigger/CollapsiblePanel components instead of a manual button toggle.
• Splits entries into overflowEntries (hidden when collapsed) and alwaysVisibleEntries (always visible), with overflow entries kept mounted via keepMounted but hidden until expanded.
• Marks the expand/collapse trigger with data-scroll-anchor-ignore so it is excluded from scroll anchoring logic.
• Adds a test asserting the collapsed UI shows the correct 'Show N more' label and carries the data-scroll-anchor-ignore attribute.

^{Macroscope summarized 557faca.}

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[Marve10s]

2026-03-30.12.07.23.mp4

Sorry, took a second for Codex and I also needed to approve access to folders for Claude :)

[juliusmarminge]

2026-03-30.12.07.23.mp4
Sorry, took a second for Codex and I also needed to approve access to folders for Claude :)

scroll behavior is kinda jank when it sometimes expands up and sometimes down. your scroll position shouldn't change when expanding:

CleanShot.2026-04-06.at.10.44.49.mp4

[Marve10s]

2026-03-30.12.07.23.mp4
Sorry, took a second for Codex and I also needed to approve access to folders for Claude :)

scroll behavior is kinda jank when it sometimes expands up and sometimes down. your scroll position shouldn't change when expanding:
CleanShot.2026-04-06.at.10.44.49.mp4

I can address that in next commit if you're okay with this change overall

[juliusmarminge]

I didn't test it out but overall seems like a solid change except for that yes

[Marve10s]

@juliusmarminge should be good to go , not sure if I should tag you or if you'd come back to this PR eventually. Thank you for reviewing and helping make the software better
Also, is there anything I can help with in your draft PRs or any tasks? I'd love to set up T3 on my WSL, saw a draft for this some time ago, right now I'm only running it on Mac

[macroscopeapp]

Approvability

Verdict: Approved

This is a self-contained UI polish fix that replaces manual expand/collapse logic with existing Collapsible UI components, adding proper cursor styling, smooth transitions, and scroll anchor behavior. No runtime behavior changes beyond UX improvements.

^{You can customize Macroscope's approvability policy. Learn more.}

Dismissing prior approval to re-evaluate 9b05426

Dismissing prior approval to re-evaluate e87ae40

Dismissing prior approval to re-evaluate 3ce44bf

Dismissing prior approval to re-evaluate 79c52c7

Dismissing prior approval to re-evaluate dce8655

Dismissing prior approval to re-evaluate b154fb4

[cursor]

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

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit b154fb4. Configure here.}

Dismissing prior approval to re-evaluate 62553cd