feat: 新增储蓄罐存取款模态框，支持金额输入、快速选择、进度展示及账户余额校验。

src/App.tsx

@@ -4,6 +4,7 @@ import { router } from './router';
 
 import { ThemeProvider, PrivacyProvider, NotificationProvider, GuideProvider, useAutoTokenRefresh } from './hooks';
 import { SettingsProvider } from './contexts/SettingsContext';
+import { Toaster } from 'react-hot-toast';
 
 /**
  * App Content Component
@@ -28,6 +29,7 @@ function App() {
           <GuideProvider>
             <SettingsProvider>
               <AppContent />
+              <Toaster position="top-center" reverseOrder={false} />
             </SettingsProvider>
           </GuideProvider>
         </NotificationProvider>