feat: Enhance Bevel & Emboss effect with contour support and algorithm improvements

- Implemented contour lookup functionality for Bevel & Emboss effect to allow for custom contour curves.
- Added contour parameter to LayerStyle and updated related structures and functions.
- Improved emboss algorithm by fixing height field calculations and ensuring proper handling of outside pixels.
- Introduced tilt component for 3D emboss effect, enhancing visual depth.
- Optimized MAE grid search parameters for better performance and accuracy.
- Expanded Iced GUI panel for Bevel & Emboss to include contour selection and additional styling options.
- Updated example scripts to reflect changes in the API and new features.

hcie-protocol/src/lib.rs

@@ -317,6 +317,7 @@ pub enum LayerStyle {
         highlight_color: [u8; 4],
         shadow_blend_mode: String,
         shadow_color: [u8; 4],
+        contour: String,
     },
     Satin { enabled: bool, opacity: f32, angle: f32, distance: f32, size: f32, color: [u8; 4], invert: bool },
     ColorOverlay { enabled: bool, opacity: f32, color: [u8; 4], blend_mode: String },