Stable v2.9.24

• fix(sites): htaccess modal didn't show apply confirmation
• feat(sites): add customer-facing .htaccess → nginx translation review
• fix(a11y): fix WCAG AA color-contrast failures across shared design tokens
• fix(import): remove wrongly-scoped automatic .htaccess translation, retract changelog claims
• fix(a11y): fix html lang sync, unlabeled selects/progressbars, add real browser-based axe testing
• fix(a11y): resolve all jsx-a11y findings — keyboard support, valid controls (Phase 3)
• fix(build): resolve jsx-a11y/eslint peer conflict, fix silent build-failure gate
• feat(a11y): add jsx-a11y lint gate as EAA/WCAG baseline (Phase 1b)