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gsxdsm db7b46f60f FN-7310: add task planner chat tab

Add a dedicated task-detail Chat surface for planner-model conversations separate from Activity steering.

- Add task-scoped planner chat session creation and routing with planning-model overrides.
- Render a new top-level Chat tab next to Activity, including streaming responses, tool-call cards, and retry/error states.
- Cover planner chat tab ordering, session reuse, route validation, manager dispatch, and dashboard documentation.

Files changed:
 .changeset/fn-7310-planner-chat.md                 |   7 +
 docs/dashboard-guide.md                            |   3 +-
 packages/dashboard/app/api/legacy.ts               |  35 +++
 .../dashboard/app/components/TaskDetailModal.tsx   |  40 ++-
 .../app/components/TaskPlannerChatTab.css          | 149 ++++++++++
 .../app/components/TaskPlannerChatTab.tsx          | 322 +++++++++++++++++++++
 ...etailModal.responsive-and-dependencies.test.tsx |  13 +-
 .../__tests__/TaskDetailModal.test-helpers.ts      |   3 +
 .../components/__tests__/TaskDetailModal.test.tsx  |  58 ++++
 .../__tests__/TaskPlannerChatTab.test.tsx          | 193 ++++++++++++
 .../dashboard/src/__tests__/chat-manager.test.ts   |  65 +++++
 .../dashboard/src/__tests__/chat-routes.test.ts    | 106 +++++++
 packages/dashboard/src/chat.ts                     | 132 ++++++++-
 .../dashboard/src/routes/register-chat-routes.ts   |  68 +++++
 14 files changed, 1181 insertions(+), 13 deletions(-)

Fusion-Task-Id: FN-7310

Fusion-Task-Lineage: a276c356-599e-4495-9879-472d157d95e5

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-06-30 17:20:42 -07:00