feat: add dark mode support with colorScheme prop and useColorScheme …

…hook

- Add colorScheme prop to OrbitProvider
- Create useColorScheme hook for theme-aware components
- Add dark mode tokens and styles
- Update Modal and InputField with dark mode support
- Add DarkModeWrapper test utility

Co-Authored-By: Jozef Képesi <[email protected]>

packages/orbit-components/src/test-utils/DarkModeWrapper.tsx

@@ -0,0 +1,18 @@
+import * as React from "react";
+
+import { OrbitProvider } from "..";
+import defaultTheme from "../defaultTheme";
+
+interface Props {
+  children: React.ReactNode;
+}
+
+export const DarkModeWrapper = ({ children }: Props) => {
+  return (
+    <OrbitProvider theme={defaultTheme} useId={React.useId} colorScheme="dark">
+      {children}
+    </OrbitProvider>
+  );
+};
+
+export default DarkModeWrapper;