[skerbis]

Summary

Extends the existing YForm table dropdown button with a Spotlight-style live search across datasets of all permitted YForm tables. This addresses the issues reported in #187 with the old yform_usability inline pjax search (destroyed addon-owned tab navigation via #rex-js-page-main replacement, and edit links always pointing to the YForm standard path even from addon-owned pages) by building the search natively into quick_navigation instead, reusing its existing table-permission and button infrastructure.

• Global overlay opened from the header YForm button (custom database+magnifier icon, not the generic fa-database)
• The table dropdown (bootstrap-select, container: 'body' so it's never clipped by the overlay) sits permanently next to the search field — it stays visible and changeable at any point, including mid-search, without losing the current search term
• Field-type-aware, collapsible filters per table: select for choice/checkbox fields, date/datetime inputs, number input
• Result preview reuses YForm's own getListValue() formatting instead of raw values:
  • choice/select values as label badges (using the field's own Label=value choices string, decoded exactly like rex_yform_value_abstract::getArrayFromString())
  • checkbox fields as colored yes/no badges
  • fields_tagging values as colored tag badges (not raw JSON)
  • yform_lang_fields JSON columns as per-language chips (not raw JSON/HTML), searched via JSON_TABLE
• name/title/cat/category columns (plus admin-configurable extra columns via a new setting on the addon's config page) are shown first and highlighted as the result's title line
• Edit links reuse the currently open addon page when it already shows the same table (via rex_be_controller::getCurrentPage()), otherwise fall back to rex_yform_manager::url() — correct CSRF handling either way, no more manually-built URLs missing CSRF params
• Keyboard navigation: arrows/tab move between the search field and the table/result list, enter opens the focused entry
• Table rows in the dropdown/list show the table's own configured icon (rex_yform_manager_table::getCustomIcon()) instead of a generic placeholder
• Table access respects isGranted()-style permission checks but does not exclude isHidden() tables (hidden only means "no menu entry in YForm manager", not "no access" — excluding them broke exactly the scenario Mobile Darstellung #187 was about, e.g. rex_yrewrite_domain_settings)
• All 8 REDAXO-core-supported languages shipped in full (de_de, en_gb, es_es, it_it, nl_nl, pt_br, ru_ru, sv_se)

Version bumped to 9.2.0, CHANGELOG and both READMEs updated.

Test plan

• Manually tested end-to-end against a REDAXO 5.21 instance with ~15 YForm tables (permission checks, hidden-table inclusion, table switching mid-search, filters incl. multi-value-choice exclusion, be_manager_relation fields correctly excluded from LIKE search to avoid SQL errors, fields_tagging/yform_lang_fields/checkbox/choice preview rendering, keyboard navigation, dropdown clipping, dark mode)
• Would appreciate a review of the rex_yform_manager_field API usage (isHiddenInList(), isSearchable(), getType()/getTypeName()) against other supported YForm versions, since this was tested against a single installed version

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