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-iced-app/crates/hcie-iced-gui/src/app.rs

@@ -1126,6 +1126,7 @@ impl HcieIcedApp {
                                         highlight_color: [255, 255, 255, 255],
                                         shadow_blend_mode: "Multiply".to_string(),
                                         shadow_color: [0, 0, 0, 255],
+                                        contour: "Linear".to_string(),
                                     },
                                     "Satin" => LayerStyle::Satin {
                                         enabled: true,
@@ -1398,6 +1399,7 @@ impl HcieIcedApp {
                                 (LayerStyle::BevelEmboss { direction, .. }, "direction") => *direction = value,
                                 (LayerStyle::BevelEmboss { highlight_blend_mode, .. }, "highlight_blend") => *highlight_blend_mode = value,
                                 (LayerStyle::BevelEmboss { shadow_blend_mode, .. }, "shadow_blend") => *shadow_blend_mode = value,
+                                (LayerStyle::BevelEmboss { contour, .. }, "contour") => *contour = value,
                                 _ => {}
                             }
                             self.documents[self.active_doc].engine.update_layer_style(layer_id, new_style);