Orders/Products/Categories/Customers/Transactions loadList() caught
errors by silently clearing the list to [] with no error state - an
API failure looked identical to a genuine 'no results' empty state.
Added an error signal to each facade (set on failure, cleared on
retry) and an error branch in each list page/component, distinct from
both loading and the real empty state.
Order and Customer detail (loadDetail) had it worse: no error handler
at all, so a failure just left the page on 'Loading...' forever with
nothing to retry or navigate away with. Added selectedLoading/
selectedError to both facades and an error screen with a back button
to both detail pages.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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