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gsxdsm 61c8bdc117 FN-7497: keep accepted chat streams waiting

Keep accepted-but-silent chat streams waiting so late responses can reconcile without false timeout failures.

- Stop aborting accepted chat streams when the first SSE event timer fires without content.
- Cover desktop, mobile, planner chat, reattach, hook, and SSE parser paths for late accepted responses.
- Add a patch changeset for the chat first-event timeout fix.

Files changed:
 .changeset/fn-7497-chat-first-event-timeout.md     |  7 +++
 .../app/api/__tests__/legacy-chat-stream.test.ts   | 27 ++++++--
 packages/dashboard/app/api/legacy.ts               |  8 ++-
 .../__tests__/ChatView.core-interactions.test.tsx  | 41 +++++++++++++
 .../__tests__/TaskPlannerChatTab.test.tsx          | 71 ++++++++++++++++++++++
 .../dashboard/app/hooks/__tests__/useChat.test.ts  | 41 +++++++++++++
 6 files changed, 188 insertions(+), 7 deletions(-)

Fusion-Task-Id: FN-7497

Fusion-Task-Lineage: bb53793d-dc78-4a25-af22-ed1c62b73094

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

2026-07-04 10:42:20 -07:00