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gsxdsm a65633d878 FN-7368: keep accepted chat sends visible after provider errors

Preserve sent chat turns when provider failures arrive after the server accepts a stream.

- Track whether chat stream errors happen before or after server acceptance.
- Reconcile persisted user-message echoes with optimistic bubbles across global chat and planner chat.
- Preserve delivered room-chat messages when reply generation or recovery refresh fails.
- Cover accepted-error and pre-acceptance rollback behavior with focused dashboard tests.

Files changed:
 .changeset/fn-7368-chat-provider-error.md          |  7 ++
 packages/dashboard/app/api/legacy.ts               | 25 ++++--
 .../app/components/TaskPlannerChatTab.tsx          | 47 ++++++++++-
 .../__tests__/TaskPlannerChatTab.test.tsx          | 71 ++++++++++++++++
 .../dashboard/app/hooks/__tests__/useChat.test.ts  | 96 ++++++++++++++++++++++
 .../app/hooks/__tests__/useChatRooms.test.ts       | 25 ++++++
 .../app/hooks/createChatStreamHandlers.ts          | 10 +--
 packages/dashboard/app/hooks/useChat.ts            | 48 ++++++++---
 packages/dashboard/app/hooks/useChatRooms.ts       |  5 +-
 9 files changed, 305 insertions(+), 29 deletions(-)

Fusion-Task-Id: FN-7368

Fusion-Task-Lineage: b7935c3f-3604-4ed5-b32e-a6ead536a991

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

2026-07-01 07:50:52 -07:00