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gsxdsm 8814925209 FN-8504: restore in-flight chat state after re-entry

Restore authoritative streaming state when users return to an active chat session.

- Delay stream attachment until the authoritative session snapshot is loaded
- Guard stream callbacks and SSE updates by selection incarnation
- Cover re-entry, stale refresh, and transcript restoration scenarios
- Add a patch changeset for the chat-state fix

Files changed:
 .changeset/fn-8504-chat-reentry-state.md           |   7 +
 .../__tests__/ChatView.streaming-thread.test.tsx   |  47 ++++
 .../dashboard/app/hooks/__tests__/useChat.test.ts  | 245 ++++++++++++++++++++-
 packages/dashboard/app/hooks/useChat.ts            | 159 +++++++++----
 4 files changed, 408 insertions(+), 50 deletions(-)

Fusion-Task-Id: FN-8504

Fusion-Task-Lineage: 0b339eb9-78d1-4db5-ae3a-e8314380662c

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

2026-07-22 19:20:55 -07:00