fix(ui): 打印隐藏AI区域蓝框 + diff弹窗字体统一

- print.ts的iframe样式中增加.ai-region隐藏规则：去除边框/背景/内边距，隐藏右上角标签
- diffModal右侧AI提议版本容器增加style属性：fontFamily SimSun、fontSize 12pt、lineHeight 1.5
- 确保打印输出和diff对比的视觉一致性

src/pages/ReportEditor.tsx

@@ -2633,6 +2633,7 @@ export default function ReportEditor() {
                   suppressContentEditableWarning
                   onBlur={(e) => setDiffModal(prev => prev ? { ...prev, newHtml: e.target.innerHTML } : null)}
                   dangerouslySetInnerHTML={{ __html: diffModal.newHtml }}
+                  style={{ fontFamily: 'SimSun, "Microsoft YaHei", serif', fontSize: '12pt', lineHeight: '1.5' }}
                 ></div>
               </div>
             </div>

src/utils/print.ts

@@ -41,6 +41,8 @@ export const printDocument = (htmlContent: string, docTitle: string = '图文报
           .smart-field-wrapper .field-label { color: #64748b; user-select: none; }
           .smart-field-wrapper .field-value { min-width: 24px; padding: 0 2px; margin: 0; border: 1px solid #cbd5e1; border-radius: 2px; display: inline-block; background: #f8fafc; color: #0f172a; line-height: inherit; font-size: inherit; vertical-align: baseline; box-sizing: border-box; outline: none; text-align: center; }
           .report-signature-img { max-width: 120px; max-height: 40px; width: auto; height: auto; object-fit: contain; vertical-align: middle; display: inline-block; }
+          .ai-region { border: none !important; background: transparent !important; padding: 0 !important; margin: 0 !important; }
+          .ai-region > [contenteditable="false"] { display: none !important; }
           @media print {
             .smart-field-wrapper .field-value { outline: none !important; box-shadow: none !important; border: none !important; border-bottom: 1px solid #000 !important; border-radius: 0 !important; background: transparent !important; padding: 0 2px 0px 2px !important; line-height: 1 !important; }
             .smart-field-wrapper .field-value.no-underline { border-bottom: none !important; }