Option resolution for extension config_schema :select fields —
shared by the Modules & Features panel and the creation form (extracted
from the panel LV when the form grew inline extension config).
The descriptor may carry a literal option list or a lazy
{module, fun} (0-arity; providers with data-driven options — the
dashboards picker). Entries normalize to %{value:, label:}; a
provider failure degrades to []. The STORED value always appears
(even when the provider no longer offers it) so a stale link is
visible instead of silently blanked.