Allow batch creation of custom item types

[jbouquiaux]

The batch create modal only offered samples/cells and submitted every non-sample row as type: "cells". It now supports the same custom item types as the single-item create modal.

Changes

• resources.js: move the "built-in + creatable custom types" logic from CreateItemModal into a shared withCreatableDynamicTypes(allowedTypes, schemas) helper. As before, custom types are only added in a samples-table context, never in the inventory modals.
• CreateItemModal.vue: use the helper. No behaviour change.
• BatchCreateItemModal.vue:
  • the type dropdown lists the built-in and creatable custom types;
  • rows are submitted with the selected type instead of a hardcoded samples/cells;
  • "Copy from" (template and per-row) only lists items of the selected type, and resets when the type changes.

Closes #2194

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.48%. Comparing base (ddb057c) to head (da6efff).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2196   +/-   ##
=======================================
  Coverage   82.48%   82.48%           
=======================================
  Files          91       91           
  Lines        8782     8782           
=======================================
  Hits         7244     7244           
  Misses       1538     1538           

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