Visibility Concern in Dark Mode for Tip Placeholder in Checkout Section - Enatega Multivendor Customer App

Describe the bug
Users have reported a visibility concern in the Enatega Multivendor Customer App when switching to dark mode. Specifically, in the checkout section where the "Add Tip" option is available, the placeholder for adding another amount in tipping appears in black, making it almost invisible against the dark background.

To Reproduce
Steps to reproduce the behavior:

Open the Enatega Multivendor Customer App.
Navigate to the checkout section.
Enable dark mode.
Observe the placeholder for adding another amount in tipping.
Expected behavior
In dark mode, the placeholder for adding another amount in the tipping section should be visible and contrast appropriately with the dark background.

Screenshots
image

Smartphone (please complete the following information):

Device: iOS and android

从客户应用的 checkout 部分开始，跟踪 Add Tip 控件，重点关注启用深色模式时用于输入自定义金额的占位符。在 iOS 和 Android 上都验证结果；当占位符在深色背景上以适当的对比度可见时，即表示完成。

由索引模型根据 Issue 内容生成。