Finish the TV calendar as a planning tool.
- Week nav: ‹ prev / Today / next › steps the 7-day window (endpoint takes
?start=; each window starts on today's weekday so "current day first" holds).
Title reflects it (This Week / Next Week / In N weeks); Today highlight only
shows when the real today is in view.
- Filter: All / In library / Missing, applied client-side (no refetch) — the
hero + grid + count all respect it.
- Hero eyebrow is context-aware (NEXT UP this week, FEATURED on other weeks).
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