fix(editor): contentEditable回车导致段落溢出.ai-content

- handleAIGenerate中获取currentHtml前增加溢出段落合并逻辑
- 遍历.ai-content之后的兄弟<p>节点，移回.ai-content内
- 合并后同步更新contentRef和saveDraftToStorage
- 确保diff弹窗左侧能显示AI可编辑区域内的全部段落

src/pages/ReportEditor.tsx

@@ -883,6 +883,23 @@ export default function ReportEditor() {
         }
       }
       const targetRegionEl = editorRef.current?.querySelector(`.ai-region[data-ai-id="${actualTargetId}"] .ai-content`) as HTMLElement | null;
+      // 合并溢出的段落：浏览器 contentEditable 可能在回车时把 <p> 生成到 .ai-content 之外
+      const aiRegion = editorRef.current?.querySelector(`.ai-region[data-ai-id="${actualTargetId}"]`);
+      if (aiRegion && targetRegionEl) {
+        let nextSibling = targetRegionEl.nextElementSibling;
+        while (nextSibling) {
+          const toMove = nextSibling;
+          nextSibling = nextSibling.nextElementSibling;
+          if (toMove.tagName === 'P') {
+            targetRegionEl.appendChild(toMove);
+          }
+        }
+        // 同步更新 contentRef 和草稿
+        if (editorRef.current) {
+          contentRef.current = editorRef.current.innerHTML;
+          saveDraftToStorage();
+        }
+      }
       const currentHtml = targetRegionEl ? targetRegionEl.innerHTML.replace(/&#8203;/g, '').trim() : '';
       const globalContextText = editorRef.current?.innerText || '';
       let messageContent: any;