feat(svg-editor): Implement SVG shape loading and editing functionality

- Add SVG shape loading from disk, allowing users to customize shapes by placing SVG files in the designated directory.
- Introduce a new `ShapeCatalog` to manage SVG shapes, prioritizing user-defined shapes over built-in templates.
- Implement an SVG editor with node-based editing capabilities, enabling users to manipulate SVG paths directly.
- Create a new `SvgEditable` structure to represent editable SVG shapes, supporting operations like adding, removing, and moving nodes.
- Enhance the GUI with an SVG editor panel for visual editing of SVG shapes, including controls for node manipulation and saving changes.
- Ensure compatibility with existing shape tools and maintain a seamless user experience across the application.

hcie-engine-api/Cargo.toml

@@ -29,6 +29,8 @@ serde_json  = "1.0"
 image       = { version = "0.25", default-features = false, features = ["png", "jpeg", "webp", "bmp", "gif", "tiff"] }
 rayon       = "1.10"
 log         = "0.4"
+dirs        = { workspace = true }
+usvg        = { workspace = true }
 
 [lib]
 crate-type = ["rlib", "staticlib"]