H-6364: Fix results layout — independent scroll containers

Wrap results page in a flex column that fills viewport height. Both the
entity panel (left) and evidence viewer (right) now scroll independently.
Evidence panel max-width set to 780px and centered. scrollToPage only
scrolls the evidence panel, not the whole page.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lunelson

apps/hash-frontend/src/pages/ingest/results.page.tsx

@@ -88,7 +88,7 @@ const IngestResultsPage: NextPageWithLayout = () => {
   };
 
   return (
-    <>
+    <Box sx={{ display: "flex", flexDirection: "column", height: "100%" }}>
       <WorkersHeader
         crumbs={[
           { title: "Ingest", href: "/ingest", id: "ingest" },
@@ -169,7 +169,8 @@ const IngestResultsPage: NextPageWithLayout = () => {
               flex: 1,
               overflow: "auto",
               p: 2,
-              maxWidth: 720,
+              maxWidth: 780,
+              mx: "auto",
             }}
           >
             <PageViewer
@@ -191,7 +192,7 @@ const IngestResultsPage: NextPageWithLayout = () => {
           </Box>
         </Box>
       )}
-    </>
+    </Box>
   );
 };