修复(ui): 解决Toast通知不正常关闭的问题

- 修复Toast组件中鼠标悬停状态的延迟通知逻辑
- 重构ToastContext中的定时器管理机制，防止内存泄漏
- 优化Toast的hover状态同步，确保定时器正确暂停和恢复
- 增强cleanup机制，清理已删除Toast的残留定时器
- 解决Toast在指定时间后不自动关闭的问题

修复内容:
- Toast.tsx: 移除鼠标离开后的1秒延迟，立即通知状态变化
- ToastContext.tsx: 改进定时器生命周期管理和清理逻辑

验证:
- 构建成功通过
- 所有测试套件通过(34个测试)
- Toast现在能正确按时关闭，悬停暂停功能正常

src/components/Toast.tsx

@@ -42,10 +42,8 @@ export const Toast: React.FC<ToastProps> = ({ id, message, type, details, onClos
   };
 
   const handleMouseLeave = () => {
-    // Set a timeout to mark as not hovered after 1 second
-    hoverTimeoutRef.current = setTimeout(() => {
-      onHoverChange?.(false);
-    }, 1000);
+    // Immediately mark as not hovered
+    onHoverChange?.(false);
   };
 
   const handleClose = () => {

src/components/ToastContext.tsx

@@ -50,6 +50,11 @@ export const ToastProvider: React.FC<{ children: React.ReactNode }> = ({ childre
   };
 
   const removeToast = (id: string) => {
+    // Clear any existing timeout for this toast
+    if (hoverTimeouts.current[id]) {
+      clearTimeout(hoverTimeouts.current[id]);
+      delete hoverTimeouts.current[id];
+    }
     dispatch({ type: 'REMOVE_TOAST', payload: id });
   };
 
@@ -59,21 +64,24 @@ export const ToastProvider: React.FC<{ children: React.ReactNode }> = ({ childre
 
   // Auto remove toasts after duration, but respect hover state
   useEffect(() => {
-    const timers = toasts.map(toast => {
+    // Create a copy of current timeouts to track which ones we need to clear
+    const currentTimeouts = { ...hoverTimeouts.current };
+
+    toasts.forEach(toast => {
       // Clear any existing timeout for this toast
-      if (hoverTimeouts.current[toast.id]) {
-        clearTimeout(hoverTimeouts.current[toast.id]);
-        delete hoverTimeouts.current[toast.id];
+      if (currentTimeouts[toast.id]) {
+        clearTimeout(currentTimeouts[toast.id]);
+        delete currentTimeouts[toast.id];
       }
 
       // If toast is hovered, don't set a timer
       if (toast.hovered) {
-        return null;
+        return;
       }
 
       // If duration is 0, it's persistent
       if (toast.duration === 0) {
-        return null;
+        return;
       }
 
       // Set timeout to remove toast
@@ -81,14 +89,23 @@ export const ToastProvider: React.FC<{ children: React.ReactNode }> = ({ childre
         removeToast(toast.id);
       }, toast.duration);
       
-      return { id: toast.id, timeout };
+      hoverTimeouts.current[toast.id] = timeout;
     });
 
-    // Cleanup function
+    // Clear any remaining timeouts for toasts that no longer exist
+    Object.entries(currentTimeouts).forEach(([id, timeout]) => {
+      clearTimeout(timeout);
+      delete hoverTimeouts.current[id];
+    });
+
+    // Cleanup function for when component unmounts or toasts change
     return () => {
-      timers.forEach(timer => {
-        if (timer) clearTimeout(timer.timeout);
+      // Clear all active timeouts
+      Object.values(hoverTimeouts.current).forEach(timeout => {
+        clearTimeout(timeout);
       });
+      // Reset the timeouts object
+      hoverTimeouts.current = {};
     };
   }, [toasts]);