fix: gradient position parser

[TtTRz]

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[Copilot]

Pull request overview

This pull request fixes the gradient position parser to properly handle CSS gradient position syntax including 1-value, 2-value, and 4-value position formats. The changes add support for position offsets relative to specific edges (e.g., left 20px bottom 10%).

Key Changes

• Added GradientSpecifiedPos enum to represent edge-relative position offsets (left/right/top/bottom with values)
• Extended GradientPosition enum with a new SpecifiedPos variant
• Completely refactored gradient_position_repr parser function to handle position-one, position-two, and position-four syntax patterns
• Added Display implementation for the new SpecifiedPos variant
• Added comprehensive test coverage for all position syntax variations

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
float-pigment-css/src/typing.rs	Adds GradientSpecifiedPos enum and updates GradientPosition enum with SpecifiedPos variant to support edge-relative positioning
float-pigment-css/src/typing_stringify.rs	Implements Display formatting for GradientPosition::SpecifiedPos variant
float-pigment-css/src/parser/property_value/gradient.rs	Major refactor of gradient position parser with new GradientPositionKeyword enum and restructured parsing logic for position-one/two/four patterns; adds parse_at_ident helper
float-pigment-css/tests/property.rs	Adds extensive test cases covering all position syntax variations including edge cases for validation

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