import csv: `same_as` is not accepting URL arrays

[J43fura]

its only accepting a single URL string instead of mutiple

[baderdean]

Proposed acceptance criteria\n- CSV import accepts as multiple URLs (array-like input) and stores them correctly.\n- Invalid URL entries are ignored or rejected with a clear row-level error message.\n- Existing CSV import formats remain backward compatible.\n- Imported values appear correctly in export/view flows.\n- Unit/integration test covers at least one multi-URL import case.

[baderdean]

Correction: field name is same_as (rendering issue in previous comment). Acceptance criteria remain the same.