- Add ItemDetailModal showing PO document (view/download/share/email) + buyer notes
- Add FileText (PO) and MessageSquare (notes) buttons to compact item list with popovers
- Fix photo upload: append to order_items.order_item_attachements (PB file field)
- Add colored left sidebar stripe per supplier group for visual distinction
- Fix popover z-index so they appear above following cards (overflow-visible + z-50)
- Extend PurchaseOrder type with documents, email_payload, supplier
- Add order_item_attachements and expand.purchase_order to OrderItem
- onShowDetails prop wired through SupplierGroup and AreaGroup
Co-authored-by: Orca <help@stably.ai>
