[PUI] Build allocation sub tables (#8380)

* Add helpers methods for table row expansion

* Render a simplified "line item sub table"

- Akin to CUI implementation
- But like, better...

* Edit / delete individual stock allocations

* Improvements for BuildLineTable and BuildOutputTable

* Improvements for table fields

* Refactoring

* Refactor BuildLineTable

- Calculate and cache filtered allocation values

* Code cleanup

* Further fixes and features

* Revert new serializer field

- Turns out not to be needed

* Add playwright tests

* Bug fix for CUI tables

- Ensure allocations are correctly filtered by output ID

* Adjust CUI table

src/frontend/src/tables/build/BuildAllocatedStockTable.tsx

@@ -161,8 +161,11 @@ export default function BuildAllocatedStockTable({
   const editItem = useEditApiFormModal({
     pk: selectedItem,
     url: ApiEndpoints.build_item_list,
-    title: t`Edit Build Item`,
+    title: t`Edit Stock Allocation`,
     fields: {
+      stock_item: {
+        disabled: true
+      },
       quantity: {}
     },
     table: table
@@ -171,7 +174,7 @@ export default function BuildAllocatedStockTable({
   const deleteItem = useDeleteApiFormModal({
     pk: selectedItem,
     url: ApiEndpoints.build_item_list,
-    title: t`Delete Build Item`,
+    title: t`Delete Stock Allocation`,
     table: table
   });