feat: implement country and state selection enhancements

[Maciej D (mdanilowicz)]

This pull request introduces a new, smart country picker component with flag icons, search, and keyboard navigation, and integrates it into registration, address, and checkout forms. It also improves form validation by requiring the state field only for countries that have states. The most important changes are grouped below:

New Smart Country Picker Component

• Added FormCountrySearchSelect, a searchable and paginated country picker with flag icons, keyboard navigation, and single-country mode.
• Added supporting subcomponents: CountrySearchSelect/Flag.vue for country flags and CountrySearchSelect/Option.vue for selectable country options. [1] [2]

Form Integration and Validation Updates

• Replaced previous country dropdowns in registration, address, and checkout forms with the new FormCountrySearchSelect component, including emitting country state changes. [1] [2] [3] [4]
• Updated form validation logic (registrationFormRules and addressFormRules) so the state field is only required if the selected country has states, using a new countryHasStates ref. (F82377b5L31R31, templates/vue-starter-template/app/utils/validation/rules/registrationFormRules.tsL51-R51)

i18n and User Feedback Improvements

• Added new i18n strings for country search loading, errors, and empty states in English, German, and Polish. [1] [2] [3]

Component and API Refactoring

• Refactored CountryStateInput.vue to use the new country picker and emit state changes, removing dependency on the old getCountriesOptions and getStatesForCountry helpers. [1] [2]

Type and Prop Updates

• Updated prop and type usage in affected components to support the new country picker and validation logic. [1] [2] [3]

These changes modernize the country selection experience, improve accessibility and validation, and lay groundwork for further enhancements.

[Patryk Tomczyk (patzick)]

let's just use readCountryGet instead of post endpoint for it

[Maciej D (mdanilowicz)]

let's just use readCountryGet instead of post endpoint for it

There is a function with both endpoints https://github.com/shopware/frontends/pull/2538/changes#diff-ba1eab2c1da44e2c9950440ab7f84f59de5385448f23e48b8727c2b404080b12R129 invokeCountrySearch

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Project	Deployment	Actions	Updated (UTC)
frontends-starter-template-extended	Ready	Preview, Comment	Jul 15, 2026 5:55pm
frontends-vue-starter-template	Ready	Preview	Jul 15, 2026 5:55pm

[Patryk Tomczyk (patzick)]

I have one question and one thing to improve