refactor(components): rewrite Button and ButtonLink components

Both:
* move styles to Sass placeholders

Button:
* add `isPressed` prop to Button
* add `isLoading` prop to Button (to differentiate state from
disabled)

ButtonLink:
* replace `external` prop with `isExternal` prop
* replace `href` prop with `to` prop

1 files changed, 98 insertions, 0 deletions

diff --git a/src/components/atoms/buttons/button/button.tsx b/src/components/atoms/buttons/button/button.tsx
new file mode 100644
index 0000000..8489b31
--- /dev/null
+++ b/src/components/atoms/buttons/button/button.tsx
@@ -0,0 +1,98 @@
+import {
+  type ButtonHTMLAttributes,
+  forwardRef,
+  type ForwardRefRenderFunction,
+  type ReactNode,
+} from 'react';
+import styles from './button.module.scss';
+
+export type ButtonProps = Omit<
+  ButtonHTMLAttributes<HTMLButtonElement>,
+  'aria-busy' | 'aria-disabled' | 'aria-pressed' | 'aria-selected' | 'disabled'
+> & {
+  /**
+   * The button body.
+   */
+  children: ReactNode;
+  /**
+   * Should the button be disabled?
+   *
+   * @default undefined
+   */
+  isDisabled?: boolean;
+  /**
+   * Is the button already executing some action?
+   *
+   * @default undefined
+   */
+  isLoading?: boolean;
+  /**
+   * Is the button a toggle and is it currently pressed?
+   *
+   * @default undefined
+   */
+  isPressed?: boolean;
+  /**
+   * Button kind.
+   *
+   * @default 'secondary'
+   */
+  kind?: 'primary' | 'secondary' | 'tertiary' | 'neutral';
+  /**
+   * Button shape.
+   *
+   * @default 'rectangle'
+   */
+  shape?: 'circle' | 'rectangle' | 'square' | 'initial';
+  /**
+   * Button type attribute.
+   *
+   * @default 'button'
+   */
+  type?: 'button' | 'reset' | 'submit';
+};
+
+const ButtonWithRef: ForwardRefRenderFunction<
+  HTMLButtonElement,
+  ButtonProps
+> = (
+  {
+    className = '',
+    children,
+    isPressed,
+    isDisabled,
+    isLoading,
+    kind = 'secondary',
+    shape = 'rectangle',
+    type = 'button',
+    ...props
+  },
+  ref
+) => {
+  const kindClass = styles[`btn--${kind}`];
+  const shapeClass = styles[`btn--${shape}`];
+  const btnClass = `${styles.btn} ${kindClass} ${shapeClass} ${className}`;
+
+  return (
+    <button
+      {...props}
+      aria-busy={isLoading}
+      aria-disabled={isDisabled}
+      aria-pressed={isPressed}
+      className={btnClass}
+      disabled={isDisabled ?? isLoading}
+      ref={ref}
+      // eslint-disable-next-line react/button-has-type -- Default value is set.
+      type={type}
+    >
+      {children}
+    </button>
+  );
+};
+
+/**
+ * Button component
+ *
+ * Use a button as call to action.
+ */
+export const Button = forwardRef(ButtonWithRef);