Full refactor of the maintenance/coming-soon page for all locales (de/en/ar,
RTL-aware) with a refined, theme-aware (light + dark) premium composition:
glass panel, live status indicator, hero title, description, launch countdown
and CTAs. Reuses the existing hero/motion system; no new dependencies.
- Add components/site/launch-countdown.tsx: hydration-safe client countdown
(days/hours/minutes/seconds), localized labels, Arabic-aware typography,
"launched" fallback when the target passes.
- Rewrite app/[locale]/coming-soon/page.tsx around the countdown and a single
easy-to-edit LAUNCH_DATE_ISO constant (default ~45 days out).
- Add comingSoon i18n keys (status, countdownLabel, unit labels, launched)
to en/de/ar.
