fix(web): keep agent images collapsed

[maria-rcks]

Agent-produced image previews were rendered while their activity row reported aria-expanded=false. This was introduced when image rendering moved outside the disclosure condition; singleton tool-call grouping is unrelated.

This keeps viewed images behind the existing row disclosure and lets image-only activities participate in expansion. The existing click and full-size preview behavior are unchanged.

Before

After

Verification

• 38 MessagesTimeline tests pass
• web typecheck passes
• targeted lint and format checks pass
• collapsed and expanded states verified in dark and light at 1280×800
• expanded image preview action verified

Built by gpt-5.6-sol in T3 Code through the Codex harness.

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Note

Low Risk
UI-only disclosure logic in the chat timeline; no auth, data, or API changes.

Overview
Fixes a mismatch where agent “viewed image” previews could render on collapsed activity rows (aria-expanded=false) after image rendering was decoupled from row expansion.

Viewed-image previews now render only when the work entry row is expanded. canExpand treats a resolved viewed-image path like other expandable content (command, detail, changed files), so image-only activities show the disclosure chevron and can be toggled. Click-to-expand and full-size preview behavior are unchanged.

^{Reviewed by Cursor Bugbot for commit 6ee95d2. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix agent viewed images to stay collapsed in PlainWorkEntryRow

Moves the viewed-image path calculation before the expandability check in PlainWorkEntryRow so rows with only a viewed image become expandable. The viewed image now renders only while the row is expanded, keeping agent images collapsed by default. Changes are in MessagesTimeline.tsx.

^{Macroscope summarized 6ee95d2.}

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This localized UI fix keeps agent images hidden until their work-log row is expanded and preserves an expand affordance for image-only entries. Because it changes the default product presentation of agent images, the default behavior warrants human review.

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