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.

view/BottomControlsIsland.tsx

@@ -30,7 +30,7 @@ export function BottomControlsIsland({ viewport, visible, action, activeTool, br
   return (
     <div
       aria-hidden={!visible}
-      className={`flex h-10 min-w-48 items-center justify-center gap-2 rounded-full border border-white/10 bg-black/70 px-2 py-1 text-xs text-white shadow-xl backdrop-blur transition-all duration-200 ${
+      className={`flex h-20 min-w-96 items-center justify-center gap-4 rounded-full px-4 py-2 text-sm text-white backdrop-blur transition-all duration-200 ${
         visible ? "pointer-events-auto translate-y-0 opacity-100" : "pointer-events-none translate-y-3 opacity-0"
       }`}
     >