a block's spacing sits with its title; page settings need the page selected

Spacing had a link in the chrome painted onto the page and lost its door with the
rest of it. It belongs beside the heading: both are properties of the selected
block, and one of the two is not worth a place of its own to go to.

The page's name and address now show only when the page row itself is selected.
With a band or a block open they sat above an editor about something else and
read as belonging to it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

web/EditorPanel.tsx

@@ -40,9 +40,16 @@ export const EditorPanel = () => {
     Above the device toggle, because the toggle scopes what is under it to one width and none of these
     three have widths.
   */
-  const { section, item } = useNav();
+  const { section, item, part } = useNav();
   const { pages } = usePages();
-  const page = section === 'pages' ? pageFromParam(pages, item) : null;
+  /*
+    Only when the PAGE row itself is selected.
+
+    A band or a block selected means the editor below is about that, and the page's own name and
+    address sitting above it read as belonging to whatever is open. They are reached by pressing the
+    page again, which is what the nav already implies.
+  */
+  const page = section === 'pages' && !part ? pageFromParam(pages, item) : null;
 
   return (
     <div className="flex size-full flex-col overflow-hidden">