https://frontendspec.dev/ 2026-07-02T17:02:02.961Z https://frontendspec.dev/patterns 2026-07-02T17:02:02.961Z https://frontendspec.dev/patterns/optimistic-updates 2026-07-02T00:00:00.000Z https://frontendspec.dev/patterns/toast-notification-system 2026-06-30T00:00:00.000Z