Group queue items into a hybrid layout: Inventory section (CARD/GRANITE/DECOM)
at top, then vendor-grouped sections for FP/Archer items sorted alphabetically.
Each section header is clickable to collapse/expand with chevron indicators.
- Extract grouping logic into reusable utility (queueGrouping.js)
- Add collapse state management (all sections expanded by default)
- Preserve cross-section multi-select, floating action bar, ticket badges
- Add 5 property-based tests covering grouping correctness, ordering,
empty section omission, count accuracy, and selection independence
fabf98790c
