Add files

src/renderer/components/paper/index.tsx

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+import type { PaperProps as MantinePaperProps } from '@mantine/core';
+import { Paper as MantinePaper } from '@mantine/core';
+import styled from 'styled-components';
+
+export interface PaperProps extends MantinePaperProps {
+  children: React.ReactNode;
+}
+
+const StyledPaper = styled(MantinePaper)<PaperProps>`
+  background: var(--paper-bg);
+`;
+
+export const Paper = ({ children, ...props }: PaperProps) => {
+  return <StyledPaper {...props}>{children}</StyledPaper>;
+};