Release v1.2.8

Fixed

• Text, field errors, dialogs and the recovery button in the lobby now meet WCAG AA contrast, including in forced-colors and high-contrast modes. The dark theme was applied to <body> only, while Cratis Components reads it from <html>, so component text followed the operating system's light or dark setting on dark surfaces (#150)
• Screen readers announce a validation error once: the error summary is the only alert, and each field's error is exposed only through its own description. That includes the legal terms checkbox. A repetition that remains for custom field errors comes from Cratis/Arc#2842 (#151)