GET /api/collections/:id books — all four branches now build cards via
the cards.go adapters. LibraryTypeMap hoisted to once per handler (it
was 1 query per item in the smart and no-library branches). The system
branch — which before stamped cards BARE (no format_group, no badge —
the ladder's only JSON gap) — now emits the same card shape as its
siblings by feeding section.Items through BookCardsFromMediaItems,
matching what BuildSections produces for the identical data. The
collection-error seed dies via the adapters' non-nil empty slices;
the no-matching-section nil result is preserved as-is (that branch
never seeded — today's 'items': null stays today's 'items': null).
Pins: CollectionsJSON, DashboardSections, MediaListBothBranches green.
John O'Keefe
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