feat(orders): Stage 5D - orders page UI hardening
- OrdersPage with search bar, status filter chips, order count, master-detail wide layout, push-navigation narrow layout
- OrderCard widget with order ID, customer name, date, status chip, item count, total
- OrderDetailPanel with customer info, shipping address, line items, total, notes, status dropdown, Add Note button, isUpdating indicator
- OrderStatusChip mapping OrderStatus to label and color
- AddNoteDialog with text field, empty-note validation, AddNoteDialogResult value object
- showOrderActionSnackBar helper for success/failure feedback
- Cross-feature onViewProduct/onViewInventory callbacks per line item
- initialFilter, initialQuery, initialSelectedId constructor params on OrdersPage
- Expanded feature_orders barrel exports (OrdersController, all presentation types)
- 25 new widget tests (OrderDetailPanel x14, AddNoteDialog x3, OrdersPage x6)
- 115/115 feature_orders tests passing, 24/24 kell_web tests passing
- Updated build_execution_tracker.md and master_development_brief.md
Mike Kell
3662f4fcc5