Rebuild ModelPing with Apple Liquid Glass design system

[vdeng-ai]

Scope

• Preserve routes, information architecture, fields, workflows, API behavior and Cloudflare request cadence.
• Replace the previous layered Liquid Glass overrides with a reusable Apple Web Design System.
• Add semantic typography/color/material/motion tokens.
• Add Standard Glass + progressive Optical Glass (SVG displacement) only for chrome/floating surfaces.
• Keep primary content/data surfaces crisp and non-glass.
• Preserve mobile web information architecture; keep theme control accessible and retain all History fields via horizontal data scrolling.
• Add repo-local design skills for Apple design and animation review/polish.

Cloudflare

No Worker/API endpoint, polling cadence, persistence behavior, or runtime capability changes. Optical effects are browser-local CSS/SVG only.

Workflow

Draft PR during implementation. CI + Cloudflare Preview are used before visual QA and final animation review.