Plan:
1.  **Filter by Outlet:** Updated POS item queries (initial load, search, SKU lookup) to filter by the current `outlet_id`.
2.  **Fix Name Display:** Updated the item card rendering to show `name_ar` if `name_en` is empty, fixing the issue where items appeared with only SKU.
3.  **Data Fix:** Ran a one-time update to assign all existing unassigned items to Outlet 1.

Changed:
*   `index.php`: Added `WHERE outlet_id = ?` to POS queries and updated item name display logic.

Notes:
*   POS now correctly shows only items for the selected outlet.
*   Items without an English name will now display their Arabic name instead of a blank space (or appearing as just SKU).

Next: Verify that switching outlets changes the POS items and that all items display a name.