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feat(FN-3946): add chat stream reattach recovery after tab suspension

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Implements Step 1 of reattaching a regular chat stream when the browser tab resumes from a hidden/suspended state, with tests covering the recovery path and documentation added to the dashboard guide.

Fusion-Task-Id: FN-3946
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Fusion
2026-05-10 11:54:48 -07:00
committed by gsxdsm
parent d8fef5e4a4
commit 47c9bfdd07
3 changed files with 64 additions and 2 deletions
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docs/dashboard-guide.md
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@@ -88,6 +88,7 @@ Chat view provides project-scoped conversations with agents.
- On mobile, the New Chat and Delete Conversation dialogs use a compact inset treatment (centered, viewport-bounded, internally scrollable) instead of the app's default full-height mobile modal chrome.
- Full Chat and Quick Chat both consume the same streamed `/api/chat/sessions/:id/messages` response contract, and both now prefer the authoritative assistant `message` snapshot on `done` while still accumulating `text` chunks when present (so providers without incremental text streaming still render output immediately)
- In-progress assistant responses now survive refresh/navigation while generation is still active: Chat restores the last durable in-flight text/thinking/tool state immediately, then resumes streaming from the stored replay point instead of starting from an empty "Connecting…" placeholder.
- If a regular Chat stream drops with a hidden-tab/browser-suspension error (for example `Load failed`) while the server is still generating, Chat suppresses the false error banner, re-attaches to the in-progress stream using the durable replay state, and reconciles the final assistant reply when generation completes.
- Chat message lists now track near-bottom scroll state: while you are reading older messages, live streaming/new replies do not force-scroll; a **Latest** jump control appears until you return to the tail.
- On mobile (`max-width: 768px`), chat bubbles are slightly wider in full Chat for improved readability while preserving header/composer gutters.
- Full Chat tool-call summaries now use a denser mobile layout: grouped and single-call collapsed rows keep icon + label + status on one line (Quick Chat-style scanability) while expanded details remain unchanged.