fix: icon loader

[juan-campuzano]

Golden test font loading improvements:

• Added an optional currentPackage parameter to loadConfiguration and loadAppFonts to register icon fonts under the packages/<currentPackage>/<family> alias, ensuring correct rendering when testing from within the package itself. [1] [2] [3] [4] [5]
• Updated the logic in fontFamilyAliases to generate the correct aliases for fonts when currentPackage is provided, handling local asset paths and avoiding duplicate or unnecessary aliases.

Documentation updates:

• Added clear documentation in README.md and skills/bc_golden_testing/SKILL.md explaining when and how to use the currentPackage parameter for golden tests involving package-owned icon fonts. [1] [2]
• Updated the CHANGELOG.md and pubspec.yaml to reflect the new version and describe the new parameter. [1] [2]

Testing:

• Added comprehensive tests to verify that the new aliasing logic works as intended for various font scenarios, including local fonts, system fonts, and fonts with existing packages/ prefixes. [1] [2]