Merge the two-page welcome/login flow into a single page with the app icon,
title, subtitle, and login inputs all on one screen. Replace the custom blue
background and white-on-blue styling with native iOS system colors and
button styles. Add missing translations (de, es, fr) for all onboarding
strings and fix localization by using LocalizedStringKey and String(localized:).
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Hendrik Hogertz
c8d9ab7397