fix: record filter matches nothing for single-value fields

[ManukMinasyan]

Problem

Filtering a table by a single-value Record custom field returns no rows, even when matching records exist. Multi-value Record fields filter correctly.

Found while answering https://github.com/orgs/relaticle/discussions/469 (using Record fields to model people-to-people relationships).

Root cause

RecordFilter branched on allow_multiple and queried a different column per cardinality:

if ($isMultiSelect) {
    $subQuery->orWhereJsonContains('json_value', $value);
} else {
    $q->whereIn('string_value', $data['values']);   // never populated
}

RecordFieldType::configure() is FieldSchema::multiChoice() regardless of allow_multiple, so values always land in json_value. The single-value branch queried a column that is always NULL for record fields:

reports_to      string_value=NULL  json_value='["01m0aez6vjvbwnq6j46f2x53pn"]'
direct_reports  string_value=NULL  json_value='["01m0aez6v9ax794ngeenxen1mk", ...]'

Also fixed

Filter option labels rendered as escaped HTML (<div class="flex items-center gap-2"><img src="data:image/svg+xml;base64…). formatOptionWithAvatar() returns avatar markup but the SelectFilter did not allow HTML. SelectFilter has no allowHtml(), so this goes through modifyFormFieldUsing() onto the inner Select. Both interpolations already pass through e().

Test

Added a dataset-driven case in ListRecordsTest covering both cardinalities. Verified load-bearing: with the source change reverted, single-value fails and multi-value passes.

Verification

• composer test:pest — 831 passed, 3 todos
• vendor/bin/phpstan analyse — no errors
• vendor/bin/pint --test — passed
• Type coverage on RecordFilter.php — 100% (repo total is 99.4% before and after this change)
• Walked in a real browser against a Relaticle app: the filter that returned "No people" now returns the expected row, and the dropdown shows the avatar + name

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