fix: Diff modal原始版本大段空白修复(20260420_0009)

- currentHtml提取后添加 replace(/>(\s+)</g, '><') 压缩标签间空白
- cleanHtml处理后同样压缩, 确保diff两侧格式对齐
- 消除模板源码排版换行被diff算法误识别为删除内容的问题

src/pages/ReportEditor.tsx

@@ -930,7 +930,7 @@ export default function ReportEditor() {
           saveDraftToStorage();
         }
       }
-      const currentHtml = targetRegionEl ? targetRegionEl.innerHTML.replace(/​/g, '').trim() : '';
+      const currentHtml = targetRegionEl ? targetRegionEl.innerHTML.replace(/&#8203;/g, '').replace(/>(\s+)</g, '><').trim() : '';
       const globalContextText = editorRef.current?.innerText || '';
       let messageContent: any;
       const selectedFrameUrls = aiSelectedFrames.map(id => capturedFrames.find(f => f.id === id)?.dataUrl).filter(Boolean);
@@ -1017,6 +1017,7 @@ export default function ReportEditor() {
         cleanHtml = cleanHtml.replace(/<br\s*\/?>/gi, '');
         cleanHtml = cleanHtml.replace(/<\/p>\s*<p>/gi, '</p><p>');
         cleanHtml = cleanHtml.trim();
+        cleanHtml = cleanHtml.replace(/>(\s+)</g, '><');
         cleanHtml = cleanHtml.replace(/<p>/gi, '<p style="padding: 0px; font-family: SimSun; font-size: 12pt; line-height: 1.5;">');
         if (targetRegionEl) {
           setDiffModal({