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dea6736e82
Color alpha channel bug and add StandardColor tests
Updated the `Color` constructor for `StandardColor` to use `StandardColors.GetArgb` instead of casting to an integer, ensuring the alpha channel (`A`) is correctly set to `0xFF` (opaque). This resolves issues with name resolution and ARGB formatting.
Added a new test class, `ColorStandardColorTests`, to verify the behavior of `Color` when initialized with a `StandardColor`. Tests include:
- Verifying `ToString` returns the correct standard color name.
- Ensuring `ToString("G")` outputs the correct opaque ARGB value.
These changes address a bug where the alpha channel was incorrectly set to `0x00` (transparent).