Add ability to associate a new company to pipeline (#350)

* Add ability to associate a new company to pipeline

* Fix tests

front/src/modules/ui/components/board/NewButton.tsx

@@ -0,0 +1,37 @@
+import { useTheme } from '@emotion/react';
+import styled from '@emotion/styled';
+
+import { IconPlus } from '@/ui/icons/index';
+
+const StyledButton = styled.button`
+  align-items: center;
+  align-self: baseline;
+  background-color: ${({ theme }) => theme.primaryBackground};
+  border: none;
+  border-radius: ${({ theme }) => theme.borderRadius};
+  color: ${({ theme }) => theme.text40};
+  cursor: pointer;
+  display: flex;
+  gap: ${({ theme }) => theme.spacing(1)};
+  justify-content: center;
+  padding: ${(props) => props.theme.spacing(1)};
+
+  &:hover {
+    background-color: ${({ theme }) => theme.secondaryBackground};
+  }
+`;
+
+type OwnProps = {
+  onClick: () => void;
+};
+
+export function NewButton({ onClick }: OwnProps) {
+  const theme = useTheme();
+
+  return (
+    <StyledButton onClick={onClick}>
+      <IconPlus size={theme.iconSizeMedium} />
+      New
+    </StyledButton>
+  );
+}