Feature: CountrySelect: Localized Sorting, Autofocus & Env-based Priority Configuration

[9uenther]

Problem

Countries were sorted by their raw translation key (English), causing incorrect
alphabetical order in localized versions. The search input was not focused
automatically when opening the dropdown, requiring an extra click. Priority
countries were hardcoded and not configurable per deployment.

Solution

• Sort countries using t(label).localeCompare() so ordering reflects the active locale
• Autofocus the search input when the dropdown opens
• Read priority country codes from VITE_FORM_COUNTRY_PRIORITY env variable

Configuration

VITE_FORM_COUNTRY_PRIORITY=DE,AT,CH,NL,BE

Reference Implementation

9uenther@073f332