When ElectrumX is still building its index (or waiting on the Bitcoin node),
AppSessionFrame shows a sync 'pre UI'. The iframe-blocked fallback ('App not
reachable / retrying') was not gated on electrsSync, so it painted over the
sync screen and read as a hard connection error. Gate it on !electrsSync,
mirroring the iframe's own guard.
Also harden the lifecycle health probe: container_health used jq '// "unknown"',
which only catches null/false — an empty-string health (a brief window under
load) rendered as a blank 'bad health: X is '. Map empty to 'unknown' so the
retry loop keeps waiting instead of failing on a transient.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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