fix: 修复剩余两个 TS 编译错误

1. ProjectAssets.tsx: 处理 file_size 可能为 undefined 的情况
2. ProjectGeneration.tsx: 替换不存在的 AutoGenerateOutlined 为 ThunderboltOutlined

apps/web/src/pages/workspace/ProjectAssets.tsx

@@ -79,7 +79,7 @@ const ProjectAssets: React.FC = () => {
                   {asset.status === 'processing' ? '⏳ 处理中' : '✓ 就绪'}
                 </span>
                 <b>{asset.name}</b>
-                <p>{(asset.file_size / 1024 / 1024).toFixed(2)} MB</p>
+                <p>{((asset.file_size || 0) / 1024 / 1024).toFixed(2)} MB</p>
               </div>
             ))}
           </div>

apps/web/src/pages/workspace/ProjectGeneration.tsx

@@ -4,7 +4,7 @@
  */
 import React, { useState, useEffect } from "react";
 import { Select, Modal, Form, message, Radio, Spin, Tooltip, Button, Empty, Tag } from "antd";
-import { AutoGenerateOutlined, PlayCircleOutlined, DeleteOutlined, CheckCircleOutlined } from "@ant-design/icons";
+import { ThunderboltOutlined, PlayCircleOutlined, DeleteOutlined, CheckCircleOutlined } from "@ant-design/icons";
 import "./ProjectGeneration.css";
 import { autoGenerateEditPlan, getEditPlans, deleteEditPlan, EditingMode, EditPlanItem, EditPlanClipItem } from "@/api/editPlans";
 
@@ -242,7 +242,7 @@ const AutoArrangePanel: React.FC<{
       </div>
       <Button
         type="primary"
-        icon={<AutoGenerateOutlined />}
+        icon={<ThunderboltOutlined />}
         loading={generating}
         onClick={handleAutoGenerate}
         className="generate-btn"