stale-containers page referenced container.id but StaleContainer wraps an
inner instance object — switch to container.instance.id at the three call
sites. env editor derived projectId from $page.params.id (string |
undefined); coalesce to empty string so call sites that pass it to API
helpers don't trip the strictNullChecks gate.
Pre-existing errors flagged by `svelte-check`; not introduced by recent
feature work but blocking the green check.
alexei.dolgolyov
2c109913bd