Home, privacy, and scan each repeated the same 13 title/canonical/Open
Graph/Twitter tags; PageMetadata now emits them once with route-specific
title, description, url, and an optional noindex. Screenshots keeps one
record per device instead of four parallel arrays plus a lookup table.
FAQ hash jumps and screenshot arrows forced behavior: 'smooth' from JS,
which bypasses the prefers-reduced-motion override in layout.css; both
now defer to CSS scroll-behavior. Removes the unused adapter-auto
dependency.
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