Add 16 unit tests for ColorAttributes covering constructor behavior, fill/stroke flags and colors, null color handling, ID constant, Attributes interface contract, toString output, and instance independence.
Addresses the P0 testing gap identified in the testing audit.
## Summary
- Add 16 unit tests for `ColorAttributes` covering constructor behavior, fill/stroke flags and colors, null color handling, ID constant, `Attributes` interface contract, `toString` output, and instance independence.
- Addresses the P0 testing gap identified in the testing audit.
Closes #7
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Summary
ColorAttributescovering constructor behavior, fill/stroke flags and colors, null color handling, ID constant,Attributesinterface contract,toStringoutput, and instance independence.Closes #7
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