phsl / new-api

- Add paymentLoading state for Alipay and WeChat payment buttons
- Add confirmLoading state for payment confirmation modal
- Implement proper loading management in preTopUp function with try-catch error handling
- Implement proper loading management in onlineTopUp function with comprehensive error handling
- Add loading={paymentLoading} to both payment method buttons to prevent double-clicks
- Add confirmLoading={confirmLoading} to modal confirmation button
- Enhance error handling with user-friendly error messages for failed operations
- Ensure loading states are properly cleared in finally blocks for consistent UX

This update provides immediate visual feedback when users interact with payment buttons,
prevents accidental double-clicks, and improves overall payment flow reliability
with comprehensive error handling and loading state management.