fix: normalize encoded face image sources

[vahapogut]

Fixes #3

@algora-pbc /claim #3

Summary

• Accept bare encoded PNG strings for Box.faceImages.top by normalizing them to data:image/png;base64,....
• Preserve existing data/URL image hrefs and support inline SVG markup by encoding it as data:image/svg+xml;base64,....
• Add regression coverage for bare encoded top-face PNGs.

Verification

• bun run build
• bun x biome check lib\render-elements.ts tests\topimage-encoded.test.ts
• Direct render verification with bun confirmed encoded face images are normalized.
• git diff --check

Note: bun test tests\topimage-encoded.test.ts is blocked on this Windows machine because the repo preload imports bun-match-svg/looks-same, and sharp fails to install/link locally.

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