fix(dye): handle fallbackColor correctly and add regression test

[supitsdu]

This PR fixes an issue in the dye function where the fallbackColor options was not being handled as expected during instantiation. The function now properly applies the fallbackColor when the input color cannot be parsed.

Changes

• Modified the dye function to apply fallbackColor (RGB only) when the main color parsing fails.
• Added unit tests to ensure the fallbackColor is applied correctly and to prevent regression.

Notes

• This fix addresses the issue in Release 2.0.0 The new tests should ensure that the fallbackColor handling remains intact in future updates.