docs: update version badge in social preview banner to v0.3.0

[Liohtml]

The README banner (social_preview.png) still showed a v0.1.0 badge. The orange version chip now reads v0.3.0 — same position, colors, and style; no other pixels touched.

Note: if you use this image as the repository's GitHub social preview, re-upload it once in Settings → General → Social preview — that copy is stored separately from the repo file.

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https://claude.ai/code/session_014ywk8AWq5mgbeERmvuhcJy

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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