feat: enhance bottom controls and UI components

- Updated BottomControlsIsland for improved layout and styling.
- Refactored LayersSheet to enhance usability and visual consistency.
- Modified ToolOverlay for better tool selection experience.
- Improved BrushControls with new ColorPicker and Slider components.
- Enhanced PanControls and TransformControls for better user interaction.
- Updated ZoomControls for consistent button sizes and styles.
- Introduced new styles for bottom controls in styles.ts and index.css.
- Added BottomControlColorPicker, BottomControlSelectMenu, and BottomControlSlider components for better modularity and reusability.

renderer/renderer.ts

@@ -53,7 +53,7 @@ export function createRenderer(canvas: HTMLCanvasElement, backend: RendererBacke
 
       context.viewport(0, 0, w, h);
       context.disable(context.SCISSOR_TEST);
-      context.clearColor(0.18, 0.18, 0.2, 1);
+      context.clearColor(0, 0, 0, 0);
       context.clear(context.COLOR_BUFFER_BIT);
       context.enable(context.SCISSOR_TEST);