fix(geo): port schema select2 dropdown hooks

[faisalahammad]

Ports the ACF 6.8.5 schema select2 hooks so the GEO Schema.org Property and Schema.org Output Format dropdowns render with the styled field-type-picker chrome instead of unstyled select2.

SCF renders both selects with select2 ('ui' => 1) in src/AI/GEO/FieldSettings.php, but the local assets/src/js/_acf-internal-post-type.js predates the schema code, so the dropdown panels miss the schema-property-select-results / schema-output-format-select-results / schema-type-select-results classes and the styled search input. SCF already has the SCSS for those classes via assets/src/sass/_admin-inputs.scss (#506), so porting only the JS is enough to light up the styled dropdown.

What is ported from ACF 6.8.5 _acf-internal-post-type.js:

• a shared schemaSelect2Template for templateResult / templateSelection
• a select2_args filter that sets args.dropdownCssClass for any select whose name includes schema_type, schema_property, or schema_output_format
• an optgroup-aware args.matcher for schema_property so typing matches parent group labels as well as child option text
• lock + prop('disabled', true) for schema_output_format when only one format is valid; acf.unlock plus an acf.isLocked guard on the way out so other locks (e.g. conditionals) still hold
• args.allowReorder = false for schema_type
• a select2_init action that on select2:open sets the search input placeholder to Type to search… for property and output format dropdowns, falling back to any open select2 container if dropdownCssClass was dropped by the $.fn.select2.amd.require compat check

CSS reference: assets/src/sass/_admin-inputs.scss:999-1011 declares the three schema-X-select-results selectors and @extends the .field-type-select-results chrome that already shipped.

Field-name sources it targets: src/AI/GEO/FieldSettings.php:145 (schema_property), src/AI/GEO/FieldSettings.php:169 (schema_output_format), src/AI/GEO/GEO.php:97-98 (schema_type). All three selects are picked up by the new filter.

Closes #507

Use of AI Tools

AI tooling was used to assist with investigation, porting from upstream ACF 6.8.5, and PR preparation. Final code was reviewed and is held to the same standard as human-authored code.

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Props faisalahammad, bernhard-reiter.

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