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gsxdsm 9cfa6d8176 FN-6578: keep sent chat messages at transcript tail

Ensure task-detail chat places newly sent user steering immediately after current transcript output and before later agent replies.

- Clamp optimistic user message timestamps after the latest transcript entry to handle client/server clock skew.
- Preserve the clamped display timestamp when reconciling persisted steering comments to avoid jumps or duplicates.
- Cover in-progress, in-review, done/refinement, desktop, mobile, and persisted reconciliation chat ordering cases.

Files changed:
 packages/dashboard/app/components/TaskChatTab.tsx  |  28 +++--
 .../app/components/__tests__/TaskChatTab.test.tsx  | 117 +++++++++++++++++++++
 2 files changed, 138 insertions(+), 7 deletions(-)

Fusion-Task-Id: FN-6578

Fusion-Task-Lineage: d9ba03c7-e151-41b6-9b00-87d5732f2fab

2026-06-17 14:52:55 -07:00