`resolveTarget` gave a bag target the same string for `description` and
`effectSummary`, and the shop row renders both, so the slice's two flagship
offers showed "Capacity: 5 Raider Trophies" on consecutive lines. Spec §5's
worked example shows it once.
A bag definition carries no flavour text of its own, so the description is now
empty and the row omits the span entirely rather than emitting an empty one.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The server always sends both fields; an optional frontend type only
dodged a transient gap in merchant.store.spec.ts's shopView() fixture
and risked a requirement line silently failing to render if a future
fixture omitted the fields. Add the two fields to that single fixture
instead (an open offer, so null/[] are the honest values) and drop the
now-unnecessary `?? []` tolerance in the template.
