Add CtaBanner component

app/soapbox/features/ui/components/__tests__/cta-banner.test.tsx

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+import { Map as ImmutableMap } from 'immutable';
+import React from 'react';
+
+import { render, screen } from '../../../../jest/test-helpers';
+import CtaBanner from '../cta-banner';
+
+describe('<CtaBanner />', () => {
+  it('renders the banner', () => {
+    render(<CtaBanner />);
+    expect(screen.getByTestId('cta-banner')).toHaveTextContent(/sign up/i);
+  });
+
+  describe('with a logged in user', () => {
+    it('renders empty', () => {
+      const store = { me: true };
+
+      render(<CtaBanner />, null, store);
+      expect(screen.queryAllByTestId('cta-banner')).toHaveLength(0);
+    });
+  });
+
+  describe('with singleUserMode enabled', () => {
+    it('renders empty', () => {
+      const store = { soapbox: ImmutableMap({ singleUserMode: true }) };
+
+      render(<CtaBanner />, null, store);
+      expect(screen.queryAllByTestId('cta-banner')).toHaveLength(0);
+    });
+  });
+});

app/soapbox/features/ui/components/cta-banner.tsx

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+import React from 'react';
+import { FormattedMessage } from 'react-intl';
+
+import { Button, HStack, Stack, Text } from 'soapbox/components/ui';
+import { useAppSelector, useSoapboxConfig } from 'soapbox/hooks';
+
+const CtaBanner = () => {
+  const { singleUserMode } = useSoapboxConfig();
+  const siteTitle = useAppSelector((state) => state.instance.title);
+  const me = useAppSelector((state) => state.me);
+
+  if (me || singleUserMode) return null;
+
+  return (
+    <div data-testid='cta-banner' className='hidden lg:block fixed bottom-0 left-0 right-0 py-4 bg-primary-600'>
+      <div className='max-w-3xl mx-auto sm:px-6 md:max-w-7xl md:px-8'>
+        <HStack alignItems='center' justifyContent='between'>
+          <Stack>
+            <Text theme='white' size='xl' weight='bold'>
+              <FormattedMessage id='signup_panel.title' defaultMessage='New to {site_title}?' values={{ site_title: siteTitle }} />
+            </Text>
+
+            <Text theme='white' className='opacity-80'>
+              <FormattedMessage id='signup_panel.subtitle' defaultMessage='Sign up now to discuss.' />
+            </Text>
+          </Stack>
+
+          <Button theme='ghost' to='/'>
+            <FormattedMessage id='account.register' defaultMessage='Sign up' />
+          </Button>
+        </HStack>
+      </div>
+    </div>
+  );
+};
+
+export default CtaBanner;