Move history replay out of the /decode SSE stream into a new
GET /decode/history JSON endpoint. The JS client now opens /decode
immediately for live packets (no gating) and fetches history in
parallel via fetch(), draining it in the background with the existing
chunked drainDecodeHistory() helper.
This ensures real-time decode messages are never blocked by a large
history payload, and removes the historyReceived gate entirely.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
sjg
35983eb971
