LIVE rendered ONLY from the EventSource snapshot handler — and that handler
swallowed render/parse errors (catch {}). If EventSource didn't establish in the
user's browser (proxy, extension, connection cap), LIVE stayed blank while the
date selector — a plain fetch — worked fine. Exactly the reported symptom.
- startStream() now does an immediate pollOnce() (the same fetch path the date
selector uses) so LIVE shows data even if SSE never connects; SSE then layers
on for low-latency pushes, with onerror -> interval polling as before.
- Surface render errors (console + conn status) instead of hiding them.
- Serve the dashboard HTML with no-store/no-cache so pushed fixes actually reach
the browser (a stale cached shell was part of why "I see nothing" persisted).
Verified headless: with EventSource forcibly disabled, LIVE still populates
(10 armed rows, pnl, risk) via the polling fallback — stamp shows "polling ·".
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
