[Suggestion] Placeholders could be better displayed on SearchScreen.

[kosenda]

Overview

When transitioning to the search screen, I found it difficult to understand where to enter keywords, so I thought it would be better to have placeholders. Alternatively, we may set the focus on the text field first when transition.

https://github.com/user-attachments/assets/399113f3-4fbe-49f3-9b7c-3e1bb8d1c78c