实现完美的浮动通知系统

- 添加自定义通知组件替代阻塞式alert
- 浮动定位不影响页面布局，宽度自适应内容
- 支持成功/错误两种样式，渐变背景+阴影效果
- 实现完整的淡入淡出动画，原地显示隐藏
- 重启提示显示4秒，普通操作反馈2-3秒
- 智能定时器管理，支持动画完成后清理

用户体验：切换供应商后优雅提示"请重启Claude Code终端以生效"

src/renderer/App.css

@@ -89,3 +89,63 @@
 .browse-btn:hover {
   background: #2980b9;
 }
+
+/* 供应商列表区域 - 相对定位容器 */
+.provider-section {
+  position: relative;
+}
+
+/* 浮动通知 - 绝对定位，不占据空间 */
+.notification-floating {
+  position: absolute;
+  top: -10px;
+  left: 50%;
+  transform: translateX(-50%);
+  z-index: 100;
+  
+  padding: 0.75rem 1.25rem;
+  border-radius: 6px;
+  font-size: 0.9rem;
+  font-weight: 500;
+  
+  width: fit-content;
+  white-space: nowrap;
+}
+
+.fade-in {
+  animation: fadeIn 0.3s ease-out;
+}
+
+.fade-out {
+  animation: fadeOut 0.3s ease-out;
+}
+
+.notification-success {
+  background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
+  color: white;
+  box-shadow: 0 4px 12px rgba(39, 174, 96, 0.3);
+}
+
+.notification-error {
+  background: linear-gradient(135deg, #e74c3c 0%, #ec7063 100%);
+  color: white;
+  box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
+}
+
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+
+@keyframes fadeOut {
+  from {
+    opacity: 1;
+  }
+  to {
+    opacity: 0;
+  }
+}

src/renderer/App.tsx

@@ -1,4 +1,4 @@
-import { useState, useEffect } from 'react'
+import { useState, useEffect, useRef } from 'react'
 import { Provider } from '../shared/types'
 import ProviderList from './components/ProviderList'
 import AddProviderModal from './components/AddProviderModal'
@@ -11,6 +11,31 @@ function App() {
   const [isAddModalOpen, setIsAddModalOpen] = useState(false)
   const [configPath, setConfigPath] = useState<string>('')
   const [editingProviderId, setEditingProviderId] = useState<string | null>(null)
+  const [notification, setNotification] = useState<{ message: string; type: 'success' | 'error' } | null>(null)
+  const [isNotificationVisible, setIsNotificationVisible] = useState(false)
+  const timeoutRef = useRef<NodeJS.Timeout | null>(null)
+
+  // 设置通知的辅助函数
+  const showNotification = (message: string, type: 'success' | 'error', duration = 3000) => {
+    // 清除之前的定时器
+    if (timeoutRef.current) {
+      clearTimeout(timeoutRef.current)
+    }
+    
+    // 立即显示通知
+    setNotification({ message, type })
+    setIsNotificationVisible(true)
+    
+    // 设置淡出定时器
+    timeoutRef.current = setTimeout(() => {
+      setIsNotificationVisible(false)
+      // 等待淡出动画完成后清除通知
+      setTimeout(() => {
+        setNotification(null)
+        timeoutRef.current = null
+      }, 300) // 与CSS动画时间匹配
+    }, duration)
+  }
 
   // 加载供应商列表
   useEffect(() => {
@@ -18,6 +43,15 @@ function App() {
     loadConfigPath()
   }, [])
 
+  // 清理定时器
+  useEffect(() => {
+    return () => {
+      if (timeoutRef.current) {
+        clearTimeout(timeoutRef.current)
+      }
+    }
+  }, [])
+
 
   const loadProviders = async () => {
     const loadedProviders = await window.electronAPI.getProviders()
@@ -58,10 +92,10 @@ function App() {
     const success = await window.electronAPI.switchProvider(id)
     if (success) {
       setCurrentProviderId(id)
-      // 移除阻塞式alert
-      console.log('供应商切换成功')
+      // 显示重启提示，时间更长
+      showNotification('切换成功！请重启 Claude Code 终端以生效', 'success', 4000)
     } else {
-      console.error('切换失败，请检查配置')
+      showNotification('切换失败，请检查配置', 'error')
     }
   }
 
@@ -70,17 +104,12 @@ function App() {
       await window.electronAPI.updateProvider(provider)
       await loadProviders()
       setEditingProviderId(null)
-      // 移除阻塞式alert，避免焦点管理问题
-      setTimeout(() => {
-        console.log('供应商更新成功')
-      }, 100)
+      // 显示编辑成功提示，时间较短
+      showNotification('供应商配置已保存', 'success', 2000)
     } catch (error) {
       console.error('更新供应商失败:', error)
       setEditingProviderId(null)
-      // 错误情况下也避免alert
-      setTimeout(() => {
-        console.error('保存失败，请重试')
-      }, 100)
+      showNotification('保存失败，请重试', 'error')
     }
   }
 
@@ -106,13 +135,22 @@ function App() {
       </header>
 
       <main className="app-main">
-        <ProviderList
+        <div className="provider-section">
+          {/* 浮动通知组件 */}
+          {notification && (
+            <div className={`notification-floating ${notification.type === 'error' ? 'notification-error' : 'notification-success'} ${isNotificationVisible ? 'fade-in' : 'fade-out'}`}>
+              {notification.message}
+            </div>
+          )}
+          
+          <ProviderList
           providers={providers}
           currentProviderId={currentProviderId}
           onSwitch={handleSwitchProvider}
           onDelete={handleDeleteProvider}
           onEdit={setEditingProviderId}
         />
+        </div>
         
         {configPath && (
           <div className="config-path">