Replace the three near-identical public card primitives (ContentCard for
content pages, SectionCard for auth/account, and the new SurfaceCard) by
merging SectionCard into SurfaceCard, which now supports an optional header
(title/icon/action). Every remaining ad-hoc inline `rounded-2xl border`
card across (site) is converted to SurfaceCard, preserving each card's unique
visuals (background images, blur, gradients) via the style passthrough.
Net result: the public site uses exactly two card components — ContentCard
(CMS/content pages) and SurfaceCard (everything else) — and the shadcn Card
in components/ui/card.tsx is left untouched for admin.
Also deletes the now-unused components/home-section.tsx.
openhands
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