refactor(swift): Update UI styles and animations for improved consistency

- Changed background colors and text colors across various components to enhance readability and visual appeal.
- Updated animation properties for smoother transitions in CanvasArea and BlockContainer.
- Adjusted styles in FallbackPicker, OverdrachtBlock, and other components to align with the new design system.
- Improved accessibility by ensuring color contrasts meet standards.

This update aims to create a more cohesive user experience throughout the application.

app/epd/swift/layout.tsx

@@ -21,7 +21,7 @@ export default async function SwiftLayout({ children }: SwiftLayoutProps) {
   }
 
   return (
-    <div className="min-h-screen bg-slate-900 text-white flex flex-col">
+    <div className="min-h-screen bg-slate-50 flex flex-col">
       {children}
     </div>
   );