Convert the app from using legacy Collection models to OrderItem-based data. Updated pages (app/page and app/map/page) and all related components (CollectionMap, CollectionItemCard, CollectModal, ProblemModal, LocationTracker) to use OrderItem and new field names (supplier, order, item_status, qty_collected/collected_date, problem_flag/notes, etc.). PocketBase client now queries/updates the order_items collection and maps status/field changes accordingly. Simplified location tracking logic and cleaned up map/navigation UI and Suspense fallbacks. Added import_suppliers.py script for migrating suppliers from NocoDB and included .DS_Store artifacts.
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