[kevin9327]

Summary

hexToRgb already accepts a 6-digit seed without a leading # ("ff00aa"). schemeFromSeed still stored seedHex.toUpperCase() as palette.seed, so that input became "FF00AA" instead of the canonical "#FF00AA" used everywhere else (and required by isHex).

When the seed parses, set seed from rgbToHex so it is always #RRGGBB. Invalid seeds are still uppercased as before.

Test plan

• npx vitest run lib/color.extended.test.ts lib/color.test.ts
• New case: schemeFromSeed("ff00aa").seed === "#FF00AA" (fails before, passes after)
• npm run typecheck

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Summary by cubic

Fixes schemeFromSeed so valid seeds without # are stored as #RRGGBB in palette.seed, matching the canonical format used elsewhere and required by isHex. Previously schemeFromSeed("ff00aa").seed returned "FF00AA".

• Invalid seeds are still uppercased as before.

^{Written for commit 36f1e6d. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}

[lnkiai]

Thanks, merged. The app itself always passes a seed with #, so this mostly keeps schemeFromSeed consistent for other callers, but it's the right normalization.