feat(toast): 实现原生Toast系统并优化会员购买错误处理

- 新增iOS原生Toast模块(NativeToastManager)，提供毛玻璃风格的Toast展示
- 重构ToastContext为原生模块调用，添加错误边界和回退机制
- 优化会员购买流程的错误处理，使用RevenueCat标准错误码
- 调整购买按钮高度和恢复购买按钮字体大小，改善UI体验
- 移除不必要的延迟和注释代码，提升代码质量

contexts/ToastContext.tsx

@@ -1,15 +1,6 @@
-import SuccessToast from '@/components/ui/SuccessToast';
-import { Colors } from '@/constants/Colors';
-import { setToastRef } from '@/utils/toast.utils';
-import React, { createContext, useContext, useEffect, useRef, useState } from 'react';
-
-interface ToastConfig {
-  message: string;
-  duration?: number;
-  backgroundColor?: string;
-  textColor?: string;
-  icon?: string;
-}
+import { Toast, ToastConfig } from '@/utils/toast.utils';
+import React, { createContext, useContext, useMemo } from 'react';
+import { Alert, Platform } from 'react-native';
 
 export interface ToastContextType {
   showToast: (config: ToastConfig) => void;
@@ -21,88 +12,76 @@ export interface ToastContextType {
 const ToastContext = createContext<ToastContextType | undefined>(undefined);
 
 export function ToastProvider({ children }: { children: React.ReactNode }) {
-  const [visible, setVisible] = useState(false);
-  const [config, setConfig] = useState<ToastConfig>({ message: '' });
-  const timeoutRef = useRef<NodeJS.Timeout | null>(null);
-
-  const showToast = (toastConfig: ToastConfig) => {
-    // 如果已有Toast显示，先隐藏
-    if (visible) {
-      setVisible(false);
-      // 短暂延迟后显示新Toast
-      setTimeout(() => {
-        setConfig(toastConfig);
-        setVisible(true);
-      }, 100);
-    } else {
-      setConfig(toastConfig);
-      setVisible(true);
-    }
-  };
-
-  const showSuccess = (message: string, duration?: number) => {
-    showToast({
-      message,
-      duration,
-      backgroundColor: Colors.light.primary, // 主题色
-      icon: '✓',
-    });
-  };
-
-  const showError = (message: string, duration?: number) => {
-    showToast({
-      message,
-      duration,
-      backgroundColor: '#f44336', // 红色
-      icon: '✕',
-    });
-  };
-
-  const showWarning = (message: string, duration?: number) => {
-    showToast({
-      message,
-      duration,
-      backgroundColor: '#ff9800', // 橙色
-      icon: '⚠',
-    });
-  };
-
-  const handleHide = () => {
-    setVisible(false);
-  };
-
-  const value: ToastContextType = {
-    showToast,
-    showSuccess,
-    showError,
-    showWarning,
-  };
-
-  // 设置全局引用
-  useEffect(() => {
-    setToastRef(value);
-  }, [value]);
+  const value = useMemo<ToastContextType>(
+    () => ({
+      showToast: (config: ToastConfig) => {
+        try {
+          Toast.show(config);
+        } catch (error) {
+          console.error('Toast.show failed:', error);
+          // 错误边界：在原生模块失败时提供回退方案
+          handleToastFallback(config.message || config.text1 || '提示', config.type);
+        }
+      },
+      showSuccess: (message: string, duration?: number) => {
+        try {
+          Toast.success(message, duration);
+        } catch (error) {
+          console.error('Toast.success failed:', error);
+          handleToastFallback(message, 'success');
+        }
+      },
+      showError: (message: string, duration?: number) => {
+        try {
+          Toast.error(message, duration);
+        } catch (error) {
+          console.error('Toast.error failed:', error);
+          handleToastFallback(message, 'error');
+        }
+      },
+      showWarning: (message: string, duration?: number) => {
+        try {
+          Toast.warning(message, duration);
+        } catch (error) {
+          console.error('Toast.warning failed:', error);
+          handleToastFallback(message, 'warning');
+        }
+      },
+    }),
+    []
+  );
 
   return (
     <ToastContext.Provider value={value}>
       {children}
-      <SuccessToast
-        visible={visible}
-        message={config.message}
-        duration={config.duration}
-        backgroundColor={config.backgroundColor}
-        textColor={config.textColor}
-        icon={config.icon}
-        onHide={handleHide}
-      />
     </ToastContext.Provider>
   );
 }
 
+/**
+ * 错误边界处理：在原生 Toast 模块失败时提供回退方案
+ */
+function handleToastFallback(message: string, type?: string) {
+  if (!message) return;
+
+  // 在 iOS 上使用 Alert 作为回退方案，避免过度打扰用户
+  if (Platform.OS === 'ios') {
+    // 只对错误和警告类型使用 Alert，其他类型仅记录到控制台
+    if (type === 'error' || type === 'warning') {
+      Alert.alert('', message, [{ text: '确定', style: 'default' }]);
+    } else {
+      console.log(`Toast (${type}): ${message}`);
+    }
+  } else {
+    // 其他平台仅记录到控制台
+    console.log(`Toast (${type}): ${message}`);
+  }
+}
+
 export function useToast(): ToastContextType {
   const context = useContext(ToastContext);
   if (context === undefined) {
     throw new Error('useToast must be used within a ToastProvider');
   }
   return context;
-}
+}