Kartes, Stacijas, and Apskats had no CSS of their own and rendered fully
edge-to-edge (no other layout control was actually shared across all pages
before this -- appContent only set min-height). clamp(16px,3vw,48px) gives
consistent side padding globally while staying full-width, not adding a
centered max-width column -- the ask was breathing room, not a narrower
layout. Verified on Rocky: Kartes now has visible margins, Home (which
already set its own max-width/padding) shows no visible double-padding
issue at 1600px viewport width.
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