fix: several smaller improvements

frontend/src/components/editor/CodeEditor.tsx

@@ -92,7 +92,7 @@ export function CodeEditor({
   }, [value, textareaId])
 
   return (
-    <div ref={containerRef} className="code-editor" style={{ minHeight: 0 }}>
+    <div ref={containerRef} className="code-editor min-h-0 h-full overflow-auto" style={{ minHeight: 0 }}>
       <Editor
         value={value}
         onValueChange={handleValueChange}

frontend/src/components/graph/BaseNode.tsx

@@ -75,11 +75,14 @@ export function BaseNode({
       data-selected={selected}
       data-path-role={connectionPathRole ?? undefined}
       style={appliedStyle}
-      tabIndex={0}
+      tabIndex={selected ? 0 : -1}
       {...props}
     >
       <div
-        className="min-h-0 flex-1 flex flex-col overflow-hidden"
+        className={cn(
+          "min-h-0 flex-1 flex flex-col overflow-hidden",
+          !selected && "pointer-events-none",
+        )}
         style={{ contain: "layout" }}
       >
         {children}
@@ -96,7 +99,9 @@ export function BaseNode({
           handleClassName="base-node-resize-handle nodrag nopan"
         />
       )}
-      {!isFullscreenInstance && handles}
+      {!isFullscreenInstance && (
+        <div className={cn(!selected && "pointer-events-none")}>{handles}</div>
+      )}
     </div>
   );
 }
@@ -198,7 +203,7 @@ export function BaseNodeContent({
   return (
     <div
       data-slot="base-node-content"
-      className={cn("min-h-0 flex-1 flex flex-col overflow-auto", className)}
+      className={cn("min-h-0 flex-1 flex flex-col", className)}
       {...props}
     />
   );

frontend/src/components/nodes/config/ConfigNode.tsx

@@ -307,7 +307,7 @@ function ConfigNodeComponent({ id, data, width, height, selected }: Props) {
                     />
                 </div>
 
-                <div ref={editorContainerRef as React.RefObject<HTMLDivElement>} className="min-h-0 flex-1 w-full nodrag nopan overflow-auto border-t border-input" style={{ minHeight: editorHeight }}>
+                <div ref={editorContainerRef as React.RefObject<HTMLDivElement>} className="min-h-0 flex-1 w-full nodrag nopan overflow-hidden border-t border-input" style={{ minHeight: editorHeight }}>
                     <CodeEditor
                         textareaId={editorId}
                         value={content}