Fix props for `<Button>` (#29780)

app/javascript/mastodon/components/button.tsx

@@ -1,26 +1,26 @@
+import type { PropsWithChildren } from 'react';
 import { useCallback } from 'react';
 
 import classNames from 'classnames';
 
-interface BaseProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+interface BaseProps
+  extends Omit<React.ButtonHTMLAttributes<HTMLButtonElement>, 'children'> {
   block?: boolean;
   secondary?: boolean;
-  text?: JSX.Element;
 }
 
-interface PropsWithChildren extends BaseProps {
-  text?: never;
+interface PropsChildren extends PropsWithChildren<BaseProps> {
+  text?: undefined;
 }
 
 interface PropsWithText extends BaseProps {
-  text: JSX.Element;
-  children: never;
+  text: JSX.Element | string;
+  children?: undefined;
 }
 
-type Props = PropsWithText | PropsWithChildren;
+type Props = PropsWithText | PropsChildren;
 
 export const Button: React.FC<Props> = ({
-  text,
   type = 'button',
   onClick,
   disabled,
@@ -28,6 +28,7 @@ export const Button: React.FC<Props> = ({
   secondary,
   className,
   title,
+  text,
   children,
   ...props
 }) => {