fix: update default values for BorderSide

[divyanshub024]

Description

Update default values for BorderSide:

  const factory StacBorderSide({
    String? color,
    @Default(StacDouble(1.0)) StacDouble width,
    @Default(StacDouble(BorderSide.strokeAlignInside)) StacDouble strokeAlign,
    @Default(BorderStyle.solid) BorderStyle borderStyle,
  }) = _StacBorderSide;
  

Related Issues

Closes #292

Type of Change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Code refactor
• Build configuration change
• Documentation
• Chore