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

顧客アプリのチェックアウトセクションから開始し、Add Tip コントロールをたどって、ダークモードが有効なときにカスタム金額を入力するためのプレースホルダーに注目してください。iOS と Android の両方で結果を確認してください。プレースホルダーが暗い背景に対して適切なコントラストで表示されれば完了です。

索引モデルが issue の本文から書いたものです。