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gsxdsm 4bd6024ef7 FN-6300: add live task chat tab

Add a live chat-style task detail tab for following and steering active agent work.

- Add TaskChatTab with grouped agent log bubbles, live-follow scrolling, and steering message composer.
- Share chat input autosize helpers between ChatView and task chat.
- Wire the Chat tab into task detail navigation with localized labels and regression coverage.

Files changed:
 docs/dashboard-guide.md                            |   2 +
 .../dashboard/app/components/AgentLogViewer.tsx    |   2 +-
 packages/dashboard/app/components/ChatView.tsx     |  25 +-
 packages/dashboard/app/components/TaskChatTab.css  | 193 ++++++++++++++
 packages/dashboard/app/components/TaskChatTab.tsx  | 276 +++++++++++++++++++++
 .../dashboard/app/components/TaskDetailModal.tsx   |  13 +-
 .../app/components/__tests__/TaskChatTab.test.tsx  | 181 ++++++++++++++
 .../TaskDetailModal.attachments-and-tabs.test.tsx  |  19 +-
 .../TaskDetailModal.definition-actions.test.tsx    | 104 ++++----
 ...etailModal.responsive-and-dependencies.test.tsx |   2 +-
 packages/dashboard/app/utils/chatInputAutosize.ts  |  18 ++
 packages/i18n/locales/en/app.json                  |   1 +
 packages/i18n/locales/es/app.json                  |   1 +
 packages/i18n/locales/fr/app.json                  |   1 +
 packages/i18n/locales/ko/app.json                  |   1 +
 packages/i18n/locales/zh-CN/app.json               |   1 +
 packages/i18n/locales/zh-TW/app.json               |   1 +
 17 files changed, 757 insertions(+), 84 deletions(-)

Fusion-Task-Id: FN-6300
Fusion-Task-Lineage: 1eb8a17b-3ca5-4cba-81c6-ac7ccce0a113

2026-06-12 10:00:08 -07:00