fix: accept JSX-like element objects

[arjxnt]

Summary

• Accept JSX-like element objects without React's required key property.
• Share the validated renderable type across Satori's public entry point, preprocessing, layout, and SVG conversion.
• Add a regression that renders an Astro-style object tree.

Fixes #765.

Validation

• �itest run test/jsx-runtime.test.tsx (3 passed)
• sc -p tsconfig.json --noEmit
• ESLint and Prettier

[vercel]

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Project	Deployment	Actions	Updated (UTC)
satori-playground	Ready	Preview, Comment, Open in v0	Jul 15, 2026 4:55am