feat(lynx): add AspectRatio component

[junghyeonsu]

Summary

Adds AspectRatio to @seed-design/lynx-react.

Changes

• AspectRatio uses the native aspect-ratio CSS property (no ::before/padding-bottom hack — Lynx has no pseudo-element styling). overflow defaults to hidden (matches web). radius/stroke are left to ImageFrame.
• AspectRatio PoC page in examples/lynx-spa (VariantCatalog with picsum placeholder images, mode="aspectFill")
• Fix: VariantCatalog "Examples" tab now scrolls (flex flex-col was missing on the wrapper)

Verification

• lynx-react: typecheck + 25 tests + build green
• lynx-spa: typecheck green
• Device PoC confirmed: ratios (1:1/4:3/16:9/3:4) render correctly, children fill, images cover

Stack

PR 4/4 — base: lynx-toggle-pkg (PR #1647). AspectRatio itself is independent; it sits at the end of the stack. Merge #1645 → #1646 → #1647 → this.

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 6cc0adc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@seed-design/lynx-react	Minor

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