feat(svg): add Tree Traversal API support via swift-resvg upgrade

[alexey1312]

• Update swift-resvg to v0.45.1-swift.3 which includes Tree Traversal API
• Add ResvgPathConverter utility for converting resvg path segments to SVG path strings
• Add extractPathFromMask/extractPathFromClipPath helpers for VectorDrawable clip-path conversion
• Add comprehensive tests for tree traversal, mask extraction, and path conversion

The Tree Traversal API enables direct access to usvg tree structure for:

• Extracting mask content for clip-path conversion (Figma flags)
• Accessing path fill/stroke properties
• Traversing group hierarchies with transforms

[gemini-code-assist]

Summary of Changes

Hello @alexey1312, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the SVG processing capabilities by upgrading the swift-resvg dependency to v0.45.1-swift.3, which integrates the powerful Tree Traversal API. This new API allows for granular interaction with SVG tree structures, enabling the introduction of a ResvgPathConverter utility. This utility, along with dedicated helper functions, streamlines the extraction and conversion of complex SVG path data from masks and clip-paths, particularly addressing compatibility challenges when converting designs from tools like Figma to VectorDrawable. The changes are thoroughly tested to ensure robustness and correctness.

Highlights

• Dependency Upgrade: The swift-resvg dependency has been updated to version 0.45.1-swift.3.
• Tree Traversal API Support: This upgrade introduces support for the Tree Traversal API, allowing direct access to the usvg tree structure.
• New Path Conversion Utility: A new ResvgPathConverter utility has been added to convert resvg path segments into standard SVG path strings.
• Mask and Clip-Path Extraction Helpers: Helper functions (extractPathFromMask, extractPathFromClipPath) are now available to extract path data from SVG masks and clip-paths, which is crucial for VectorDrawable conversion, especially for Figma-style designs.
• Comprehensive Testing: Extensive unit tests have been added to validate the new tree traversal, mask extraction, and path conversion functionalities.

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[gemini-code-assist]

Code Review

This pull request is a great addition, upgrading swift-resvg to enable a new Tree Traversal API and introducing a ResvgPathConverter utility to leverage it. The implementation is solid and accompanied by a comprehensive set of tests. My feedback focuses on a few areas for improvement: enhancing performance in string generation, reducing code duplication in the new utility for better maintainability, and strengthening test assertions to make them more specific and robust against future changes. Overall, these changes effectively add valuable new capabilities for SVG processing.