fix: harden array builder editing workflows

tests/integration/split-layout-ui.test.js

@@ -51,6 +51,7 @@ const LAYOUT_CASES = [
     defaultGridTracks: 2,
     homePanelWidth: 360,
     homeGridTracks: 1,
+    compactWorkspaceFirst: true,
   },
 ];
 
@@ -444,7 +445,12 @@ async function exerciseSplitLayout(definition) {
 
     const panelRect = mounted.panel.getBoundingClientRect();
     const workspaceRect = mounted.workspace.getBoundingClientRect();
-    if (definition.panelSide === "start") {
+    if (definition.compactWorkspaceFirst) {
+      assert(
+        panelRect.top >= workspaceRect.bottom - 1,
+        definition.label + " compact workspace precedes the long settings panel",
+      );
+    } else if (definition.panelSide === "start") {
       assert(
         workspaceRect.top >= panelRect.bottom - 1,
         definition.label + " compact workspace follows the panel vertically",