fix(ListView): empty state not filling available width (#39387)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

superset-frontend/src/components/ListView/ListView.tsx

@@ -188,6 +188,7 @@ const ViewModeContainer = styled.div`
 const EmptyWrapper = styled.div`
   ${({ theme }) => `
     padding: ${theme.sizeUnit * 40}px 0;
+    width: 100%;
 
     &.table {
       background: ${theme.colorBgContainer};