Enatega Customer Application: Voucher Input & Add Tip Placeholder Visibility Issues in Dark Mode

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Describe the bug

The voucher input field placeholder is not clearly visible in Dark Mode, making it difficult for users to identify the field's purpose.
The Add Tip option placeholder does not fade properly, which may cause it to appear too prominent compared to other UI elements.

To Reproduce
Steps to reproduce the behavior:

Go to 'Enatega Customer App'
Place an order, before placing the order there is the checkout screen.
See error there the Voucher option and Add tip option now click others option the placeholder you will see is showing 25 in others tip placeholder.

Expected behavior
he voucher input placeholder should have sufficient contrast to remain visible in Dark Mode.
The Add Tip placeholder should fade appropriately, maintaining a subtle presence without overwhelming other text.

Smartphone (please complete the following information):

Device: [e.g. Infinix+Iphone]
OS: [e.g. iOS and Android]
Browser [e.g. Application]
Version [e.g. latest]

Start at the Enatega Customer App checkout screen and reproduce the voucher and Add Tip placeholder behavior in Dark Mode. Verify the voucher placeholder has sufficient contrast and that the Add Tip placeholder fades appropriately, then confirm the corrected appearance on the reported mobile platforms.

Written by the indexing model from the issue text.