修复 首次生成结果不显示的问题；

src/store/useAppStore.ts

@@ -1,6 +1,7 @@
 import { create } from 'zustand';
 import { devtools } from 'zustand/middleware';
 import { Project, Generation, Edit, SegmentationMask, BrushStroke } from '../types';
+import { generateId } from '../utils/imageUtils';
 
 interface AppState {
   // 当前项目
@@ -140,7 +141,15 @@ export const useAppStore = create<AppState>()(
           ...state.currentProject,
           generations: [...state.currentProject.generations, generation],
           updatedAt: Date.now()
-        } : null
+        } : {
+          // 如果没有项目，创建一个新项目包含此生成记录
+          id: generateId(),
+          title: '未命名项目',
+          generations: [generation],
+          edits: [],
+          createdAt: Date.now(),
+          updatedAt: Date.now()
+        }
       })),
       
       addEdit: (edit) => set((state) => ({