fix(layout): use LayoutPageWithHiddenFooter in differential flamegraph

Same fix as profile summary — move footer-hiding CSS from the inner
container to the Layout.Page wrapper so the sibling selector still
matches the footer element.

Co-Authored-By: Claude Opus 4.6 <noreply@example.com>

Author: priscilawebdev

static/app/views/profiling/differentialFlamegraph.tsx

@@ -349,15 +349,17 @@ const DifferentialFlamegraphContainer = styled('div')`
   display: flex;
   flex-direction: column;
   flex: 1;
+`;
 
+const LayoutPageWithHiddenFooter = styled(Layout.Page)`
   ~ footer {
     display: none;
   }
 `;
 
 function DifferentialFlamegraphWithProviders() {
   return (
-    <Layout.Page>
+    <LayoutPageWithHiddenFooter>
       <FlamegraphThemeProvider>
         <FlamegraphStateProvider
           initialState={{
@@ -370,7 +372,7 @@ function DifferentialFlamegraphWithProviders() {
           <DifferentialFlamegraphView />
         </FlamegraphStateProvider>
       </FlamegraphThemeProvider>
-    </Layout.Page>
+    </LayoutPageWithHiddenFooter>
   );
 }