Refactor content status terminology and enhance cluster serializers with idea and content counts

frontend/src/config/pages/clusters.config.tsx

@@ -120,6 +120,13 @@ export const createClustersPageConfig = (
         width: '120px',
         render: (value: number) => value.toLocaleString(),
       },
+      {
+        key: 'ideas_count',
+        label: 'Ideas',
+        sortable: false,
+        width: '120px',
+        render: (value: number) => value.toLocaleString(),
+      },
       {
         key: 'volume',
         label: 'Volume',
@@ -170,8 +177,8 @@ export const createClustersPageConfig = (
         },
       },
       {
-        key: 'mapped_pages',
-        label: 'Mapped Pages',
+        key: 'content_count',
+        label: 'Content',
         sortable: false,
         width: '120px',
         render: (value: number) => value.toLocaleString(),