Build an internal inventory and order-management admin dashboard

Build an internal admin dashboard called StockDesk for a 6-person warehouse team at a small furniture importer to track inventory and orders. This is an internal tool — no public sign-up, only invited staff.

Data model:
- User: id, name, email, role (admin or staff).
- Product: id, sku, name, category, unit_cost, reorder_threshold, quantity_on_hand.
- Supplier: id, name, contact_email, lead_time_days.
- Order: id, product_id (references Product), supplier_id (references Supplier), quantity, status (pending, shipped, or received), ordered_at, expected_at.
- StockMovement: id, product_id (references Product), change_qty (positive or negative), reason (restock, sale, adjustment, or damage), created_by (references User), created_at.

Screens:
1. Login — invite-only, no public sign-up form.
2. Dashboard: products below their reorder_threshold, pending orders, and a 7-day stock-movement activity feed.
3. Products table: sortable and filterable by category, inline-editable quantity_on_hand, a visual flag on low-stock rows.
4. Product detail page: the full StockMovement history for that product, plus a "create purchase order" action that opens the Order form pre-filled with a suggested quantity of 2 times the reorder_threshold.
5. Orders table: filter by status. Marking an order as received must automatically create a matching StockMovement and increase quantity_on_hand — these two actions are one transaction, not two separate manual steps.
6. Admin-only screen: manage Users and their roles.

Constraints:
- Use Lovable's Supabase integration for auth — invite-only, with public sign-up disabled in the auth settings — and for the database.
- Role-based access: staff can view everything and log stock movements; only admin can add or remove users or edit unit_cost.
- No branding beyond a simple wordmark — this is never client-facing.
- This tool is used on a warehouse-floor tablet as much as a desktop — the Products and Orders tables must stay usable at a 10-inch tablet, roughly 1280x800, landscape orientation, not just at desktop width.