💄 header nav

src/renderer/styles/app.css

@@ -140,6 +140,15 @@
   background: var(--editor-bg);
 }
 
+/* Flex row containing the optional outline panel + the CodeMirror editor */
+.editor-body {
+  flex: 1;
+  display: flex;
+  flex-direction: row;
+  overflow: hidden;
+  min-height: 0;
+}
+
 /* ─── Chat area ────────────────────────────────────────────────── */
 .chat-area {
   overflow: hidden;