gallery: agent-pane.docked-chat at the chat dock's widths

[teamleaderleo]

Summary

Adds the gallery entry agent-pane.docked-chat: the whole agent pane at the left chat dock's widths. The chat dock (a dock column with the agent_chat role, #18169 and #18170) takes 25-40% of the content area, so the entry's widths are that share of a 1200 px window (300, 400 and 480 px) rather than the pane presets.

Variants (static states only; post-click states wait for the play-step runner):

• new-chat: an empty prompt and the location row at dock width.
• after-turn: a finished turn with tool rows.
• working: a running turn, with Stop in place of Send.
• long-title: a long chat title in the header.

It covers page:cmux.agent and App.tsx#AcpmuxApp, which agent-pane.transcript already covers. No exported component is unique to the dock, so the coverage allowlist doesn't change.

Testing

Not run locally: this lane runs no bun commands on the dev machine. CI's webviews jobs run test/gallery-coverage.test.ts and the typecheck on this PR. The fixtures use only the existing builders in gallery/fixtures/acpmux.ts, with the same fields as agent-pane.composer and agent-pane.transcript.

User-facing strings: none (gallery fixtures, l10n-allow-file).

Changelog

none

🤖 Generated with Claude Code

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Summary by cubic

Adds the gallery entry agent-pane.docked-chat, showing the whole agent pane at the left chat dock's widths (300, 400, and 480 px) instead of the pane presets.

Variants cover an empty new chat, a finished turn with tool rows, a running turn with Stop in place of Send, and a long title in the header. Reuses the existing acpmux fixtures and agent-pane.transcript's coverage; no exported component changes.

^{Written for commit 4945500. Summary will update on new commits.}

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Note

Low Risk
Gallery-only fixture file with no shipped UI or runtime behavior changes.

Overview
Adds a new webviews gallery entry agent-pane.docked-chat so the agent pane can be previewed at left chat dock widths (300 / 400 / 480 px for narrow–wide), instead of the usual pane presets.

The entry reuses existing acpmux fixture builders and declares the same coverage as agent-pane.transcript (page:cmux.agent, AcpmuxApp). Four static variants document dock layout: new chat, after-turn (tools + transcript wrapping), working (Stop vs Send), and long-title header truncation.

^{Reviewed by Cursor Bugbot for commit 4945500. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[github-actions]

Passes: CI passes on 4945500fc7.

CI passes on 4945500fc7 (run 37566776126 attempt 1).

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37567938071 at f43f800 failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 86019f6. This pull request is one of 3 merged since: #18105, #18198, #18165.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37567471217 at 2a1b504 failed: cmux-next checks (god files, concurrency, crash safety, l10n), cmux-next generated files.
Those jobs last passed at 86019f6. This pull request is one of 2 merged since: #18105, #18198.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37568316271 at 169c1da failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 86019f6. This pull request is one of 3 merged since: #18105, #18198, #18165.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37568445230 at 3c11c5a failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 86019f6. This pull request is one of 3 merged since: #18105, #18198, #18165.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37568512187 at e8aa5c1 failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 86019f6. This pull request is one of 3 merged since: #18105, #18198, #18165.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37569422881 at 552e7cb failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 86019f6. This pull request is one of 4 merged since: #18105, #18198, #18165, #18205.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37569270312 at f60b3d7 failed: cmux-next checks (god files, concurrency, crash safety, l10n), cmux-next generated files.
Those jobs last passed at 86019f6. This pull request is one of 4 merged since: #18105, #18198, #18165, #18205.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37569941713 at 46215de failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 86019f6. This pull request is one of 4 merged since: #18105, #18198, #18165, #18205.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37569551101 at 5976099 failed: cmux-next checks (god files, concurrency, crash safety, l10n), cmux-next generated files.
Those jobs last passed at 86019f6. This pull request is one of 4 merged since: #18105, #18198, #18165, #18205.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/37570246034 at e8a5696 failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 86019f6. This pull request is one of 5 merged since: #18105, #18203, #18198, #18165, #18205.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.