Various fixes (#11567)

In this PR:
- Remove SignUpLoading blank screen by an empty dark overlay =>
VerifyEffect
- Add ModalContent from pages themselves instead of using it the Layout.
This allow for empty dark overlay without showing an empty modal with
padding

packages/twenty-front/src/modules/auth/components/AuthModal.tsx

@@ -3,7 +3,7 @@ import { ScrollWrapper } from '@/ui/utilities/scroll/components/ScrollWrapper';
 import styled from '@emotion/styled';
 import React from 'react';
 
-const StyledContent = styled(Modal.Content)`
+const StyledContent = styled.div`
   align-items: center;
   justify-content: center;
 `;