fix: keep homepage section order consistent across locales

[hoangsvit]

Summary

• Add a stable program-countdown-host directly in the shared calculator DOM.
• Keep the countdown anchor before the Extension section for every homepage locale.
• Avoid relying only on post-hydration DOM insertion, which could make localized homepages appear in a different order depending on mount timing.
• Add a regression test that locks the countdown anchor position.

Why

The default and localized homepage sources declare the same component order, but ProgramCountdown previously created its own host dynamically after hydration. Localized routes load catalog/translation work at a different time, so a deterministic server-rendered anchor is safer and keeps layout order identical.

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[github-actions]

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