The assist flow previously tied the entire LLM generation to a single
POST request with no keepalives, causing NS_ERROR_NET_PARTIAL_TRANSFER
in Firefox when Hypercorn closed the connection during gaps between
chunks. This refactor decouples generation into a background task with
a buffer and a separate SSE stream — the same pattern used by chat.
- generation_buffer.py: Widen _buffers to support string keys, add
create/get/remove_assist_buffer() using "assist:{user_id}" keys,
fix cleanup log format for string keys
- generation_task.py: Add run_assist_generation() — lightweight
background task with no DB persistence or title generation
- notes.py: Replace single POST SSE route with POST /api/notes/assist
(returns 202) + GET /api/notes/assist/stream (SSE with 15s keepalives
and Last-Event-ID reconnection); 409 if already running
- useAssist.ts: Switch from apiStreamPost to apiPost + apiSSEStream
two-step pattern with named event mapping and stream handle cleanup
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
bvandeusen
a89d25f5d6