Agent pane: show header status only for problems

[lawrencecchen]

Removes the repeated title and normal connection/turn status from the agent pane header. Disconnected, retrying after a failure, and failed states show a muted icon label with details in a tooltip. The status slot cannot resize the right-side tools, and the pane keeps the chat title as its accessible name.

The gallery directory is absent on this base. Includes regenerated agent-pane HTML, JavaScript, and all 21 locale bundles. Related: #18152 removes the title only; this follows the lead’s broader problem-only status decision on the assigned branch.

Changelog

Fixed: Removed redundant agent chat header text while keeping connection problems and the pane’s accessible name.

Validation

• Red commit 3109b8f403bf: cd webviews && bun test src/agent-session/acpmux/transcript.test.tsx --test-name-pattern 'agent pane header' — 9 expected failures.
• Same focused command after the fix: 9 passed.
• Transcript, model, header-tools, harness-switch, and i18n suites: 117 passed in jsdom/pure unit tests.
• Webviews typecheck, lint, and fmt check passed.
• scripts/cmux-next/check-l10n.sh: 94 tables, 21 languages, 0 errors. Agent-pane catalog/generated-key audit passed for all 21 locales; retired status keys removed. localize-changes has no outstanding changed translation rows, but its strict global validator fails on the existing translation backlog.
• Agent-pane web bundle regenerated and checked.
• Initial verify-local.py found existing localization, localization-default mismatch, and workspace-package-group failures before the fix.
• No Playwright, browser test runner, cargo, zig, xcodebuild, or swift test was run. Visual layout and VoiceOver are not dogfood-verified.

The selected design was provided by the lead; no alternate variants or new settings/actions were added.

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Summary by cubic

Removes the repeated title, normal connection status, and changes counts from the agent pane header, showing status only when the agent is disconnected, retrying after a failure, or failed. Problem details remain in a tooltip; the chat title stays as the pane's accessible name, and changes counts are exposed only to VoiceOver.

• Keeps the status and changes slots from resizing the header's right-side tools.
• Updates tests, generated web assets, and all 21 locale bundles.

^{Written for commit 98c4283. Summary will update on new commits.}

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Note

Low Risk
UI and string-catalog changes only; connection logic is unchanged. Accessibility relies on the shell aria-label instead of visible header title text.

Overview
The agent pane header no longer shows the chat title or routine connection/working labels during normal operation. Problem-only status appears for disconnected, reconnecting (after errors), and failed connections: a muted icon plus short label, with fuller detail in a tooltip. The status area is laid out so it does not push or resize the right-side header tools, and the session title remains the pane’s accessible name via aria-label on the shell.

Localization is updated across all agent-pane locale bundles: retired keys such as header.connecting, header.working, and header.mock are removed in favor of header.disconnected and header.failed, with header.reconnecting kept for retry states. Generated web assets and transcript header tests are aligned with the new behavior.

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[github-actions]

Unclear: web / react-apps-check failed: no known signature; failed step: Test webviews.

CI failed on 98c4283caa (run 37568257687 attempt 1): 1 unknown.
macOS jobs did not run: compile and app tests were skipped: Fast static checks skipped.

Job	Verdict	Why
web / react-apps-check	unknown	no known signature; failed step: Test webviews

Not re-run automatically: web / react-apps-check is not a machine failure.

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.

[blacksmith-sh]

Found 2 test failures on Blacksmith runners:

Failures

Test	View Logs
test_every_source_and_test_directory_is_a_target (main.GraphCoversThePackage.test_e very_source_and_test_directory_is_a_target) (directory='CmuxNextRemoteBrowser')/ test_every_source_and_test_directory_is_a_target (main.GraphCoversThePackage.test_e very_source_and_test_directory_is_a_target) (directory='CmuxNextRemoteBrowser')	View Logs
test_every_source_and_test_directory_is_a_target (main.GraphCoversThePackage.test_e very_source_and_test_directory_is_a_target) (directory='CmuxNextRemoteBrowserTests')/ test_every_source_and_test_directory_is_a_target (main.GraphCoversThePackage.test_e very_source_and_test_directory_is_a_target) (directory='CmuxNextRemoteBrowserTests')	View Logs

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