feat(lynx): add lynx-image headless package

[junghyeonsu]

Summary

Adds @seed-design/lynx-image — a headless hook for Lynx <image> load state.

Changes

• New package @seed-design/lynx-image with useImage (loadingStatus + handleLoad/handleError mapped to bindload/binderror)
• Web img.complete/naturalWidth and data-loading-state selector are dropped; state is derived from Lynx events, and fallback toggling is done via conditional rendering by the consumer
• useImage PoC page in examples/lynx-spa (normal + broken image → fallback overlay)

Verification

• lynx-image: bunchee build green
• lynx-spa: typecheck green
• Device PoC confirmed: bindload/binderror fire and fallback toggles

Stack

PR 2/4 — base: lynx-headless-hooks-split (PR #1645). Merge PR #1645 first.

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 444ffc9

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-image	Minor

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