various improvements, edit tournament, etc

src/components/button.tsx

@@ -0,0 +1,11 @@
+import { Button as MantineButton, ButtonProps as MantineButtonProps } from '@mantine/core';
+import { forwardRef, ComponentPropsWithoutRef } from 'react';
+
+type ButtonProps = MantineButtonProps & ComponentPropsWithoutRef<'button'>;
+
+const Button = forwardRef<HTMLButtonElement, ButtonProps>((props, ref) => {
+  return <MantineButton fullWidth ref={ref} {...props} />;
+});
+
+Button.displayName = 'Button';
+export default Button;