fix(bindx-ui): search a relation column's filter by its text fields, not its id

[matej21]

Fixes #138.

Problem

The search box in a DataGridHasOneColumn / DataGridHasManyColumn header filter searched every scalar of the column's related selection. That selection always holds the relation's id, so typing „Al" sent:

{ "or": [{ "id": { "containsCI": "Al" } }, { "name": { "containsCI": "Al" } }] }

A Contember engine offers containsCI on String columns only. It rejected the query, and the panel showed no rows for any search.

Fix

extractScalarFieldNames in both column files leaves id out of the searched fields. The search now sends { name: { containsCI: "Al" } }.

Tests

• tests/react/dataview/relationFilterSearchFields.test.tsx (first commit) types into the header filter of a has-one and a has-many column and checks the options query. It fails on main and passes with the fix.
• bun run typecheck, bun run lint, bun run test (2200 pass, 0 fail).

A more complete fix would keep only fields whose SchemaRegistry.getColumnType is String, so that a cell rendering a number, date or enum does not break the search either. It needs a schema with column types, which testSchema does not carry, so it is left out here.

🤖 Generated with Claude Code

https://claude.ai/code/session_013L98ArhvRJ1p7riCvTRXBf