* fix: error when updating bookmarks if no query data
* feat: localize bookmark dialog, form labels and validation messages, also improve validation
* feat: add localization for EmptyPromptPreview component and update translation.json
* chore: add missing localizations for static UI text
* chore: update AgentPanelContextType and useGetAgentsConfig to support null configurations
* refactor: update agent categories to support localization and custom properties, improve related typing
* ci: add localization for 'All' category and update tab names in accessibility tests
* chore: remove unused AgentCategoryDisplay component and its tests
* chore: add localization handling for agent category selector
* chore: enhance AgentCard to support localized category labels and add related tests
* chore: enhance i18n unused keys detection to include additional source directories and improve handling for agent category keys
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