🐛 fix(query-results): 区分执行消息内容区域

- 为执行消息正文滚动区增加独立边框和浅背景
- 保留标题与复制按钮在顶部区域，正文内容单独成框
- 补充消息块样式断言，覆盖边框、背景和内边距

frontend/src/components/QueryEditor.results-and-drop.test.tsx

@@ -1241,7 +1241,9 @@ describe('QueryEditor external SQL save', () => {
       overflow: 'auto',
       width: '100%',
       minWidth: 0,
+      padding: '10px 12px',
     });
+    expect(messageTextarea.props.style.padding).not.toBe(0);
     expect(messageTextarea.props.style.minWidth).not.toBe('max-content');
     expect(messageBlock.props.style).toMatchObject({
       alignItems: 'stretch',
@@ -1253,7 +1255,10 @@ describe('QueryEditor external SQL save', () => {
       width: '100%',
       overflow: 'hidden',
       minWidth: 0,
+      borderRadius: 6,
     });
+    expect(messageScrollBody.props.style.border).toContain('1px solid');
+    expect(messageScrollBody.props.style.background).toBeTruthy();
     expect(messageTextarea.props.value).not.toContain('mssql:');
   });
 

frontend/src/components/QueryEditorResultsPanel.tsx

@@ -180,6 +180,8 @@ const QueryEditorResultsPanel: React.FC<QueryEditorResultsPanelProps> = ({
                     overflow: 'hidden',
                     minWidth: 0,
                     borderRadius: 6,
+                    border: darkMode ? '1px solid rgba(255,255,255,0.14)' : '1px solid rgba(0,0,0,0.10)',
+                    background: darkMode ? 'rgba(0,0,0,0.18)' : 'rgba(0,0,0,0.018)',
                 }}
             >
                 <textarea
@@ -197,7 +199,7 @@ const QueryEditorResultsPanel: React.FC<QueryEditorResultsPanelProps> = ({
                         minWidth: 0,
                         height: '100%',
                         minHeight: compact ? 72 : 0,
-                        padding: 0,
+                        padding: compact ? '8px 10px' : '10px 12px',
                         margin: 0,
                         border: 'none',
                         resize: 'none',