feat(layout): impl grid layout

[TtTRz]

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[Copilot]

Pull request overview

This pull request implements CSS Grid Layout functionality for the float-pigment layout engine, adding support for display: grid and display: inline-grid with core grid properties like grid-template-rows, grid-template-columns, grid-auto-flow, justify-items, and justify-self.

Changes:

• Implements CSS Grid Layout Module Level 1 algorithms (placement, track sizing, alignment)
• Adds SizingMode enum to support min-content/max-content sizing for grid items
• Extends layout traits with grid-specific properties and methods
• Adds comprehensive test coverage for grid layout features

Reviewed changes

Copilot reviewed 65 out of 66 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
float-pigment-layout/src/lib.rs	Adds grid-related trait methods, exports SizingMode, comments out #![no_std]
float-pigment-layout/src/unit.rs	Integrates SizingMode into layout computation, adds min_content_size to results
float-pigment-layout/src/algo/grid/*	New grid layout algorithm implementation (placement, track sizing, alignment, matrix)
float-pigment-layout/src/types.rs	Adds grid template types and Clone trait bounds
float-pigment-layout/Cargo.toml	Adds grid crate dependency
float-pigment-css/src/typing.rs	Adds grid-related CSS types and properties
float-pigment-forest/*	Integrates grid layout into forest implementation and adds extensive tests

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