docs: squircle corner design standard#1
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Adds DESIGN.md documenting the CVER squircle corner convention, mirroring what already shipped in cver.net (global.css --corner) and liquidframe (--lf-corner). Covers web (corner-shape progressive enhancement, Chromium-only mid-2026, zero regression), Tailwind and plain-CSS/Svelte/HTML application, and SwiftUI .continuous. Pills/circles stay round; non-UI repos skip cleanly. Links the new doc from README.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Establishes the squircle corner as a documented CVER design convention.
What changed
The standard
Every CVER surface with a finite corner radius uses a continuous-curvature corner (a squircle), mirroring what already shipped in
cver.net(--corner) andliquidframe(--lf-corner).corner-shape: squirclelayered on top of the existingborder-radiusvia a--cornertoken. It is Chromium-only as of mid-2026 (Safari/WebKit & Firefox keep the radius arc) — pure progressive enhancement, zero visual regression. Tailwind: one low-specificity:where(.rounded-*)rule, excludingrounded-full. Plain CSS/Svelte/HTML: token +corner-shapenext to each finite radius. Pills/circles stay round..continuous; leaveCapsule()/Circle()alone.Doc-only change.