fix: Ensure attachment modal appears above Command Menu button using createPortal (#12112)

<img width="1509" alt="Screenshot 2025-05-19 at 12 50 48 AM"
src="https://github.com/user-attachments/assets/fba95ecb-015a-4742-bda2-4d515d168c16"
/>


Closes #12092

packages/twenty-front/src/modules/activities/files/components/AttachmentList.tsx

@@ -1,5 +1,6 @@
 import styled from '@emotion/styled';
 import { lazy, ReactElement, Suspense, useState } from 'react';
+import { createPortal } from 'react-dom';
 
 import { DropZone } from '@/activities/files/components/DropZone';
 import { useUploadAttachmentFile } from '@/activities/files/hooks/useUploadAttachmentFile';
@@ -184,7 +185,9 @@ export const AttachmentList = ({
           </StyledDropZoneContainer>
         </StyledContainer>
       )}
-      {previewedAttachment && isAttachmentPreviewEnabled && (
+      {previewedAttachment &&
+        isAttachmentPreviewEnabled &&
+        createPortal(
           <StyledModal
             modalId={PREVIEW_MODAL_ID}
             size="large"
@@ -228,7 +231,8 @@ export const AttachmentList = ({
                 </Suspense>
               </StyledModalContent>
             </ScrollWrapper>
-        </StyledModal>
+          </StyledModal>,
+          document.body,
         )}
     </>
   );