Fixing Issue #98/While In Dark Mode Text In The Search Bar In The Map Is Black

[teamomiamigo]

This PR addresses the issue where the search bar text in dark mode was not readable. The following changes were implemented to ensure better usability and alignment with the dark mode theme from my previous commit, which was staged on not the proper branch, so a new PR has been made to show proper changes and test cases added:

• Updated the TextInput styling in the ExploreScreen to dynamically set the text color based on the active theme (light or dark mode).
• Adjusted the placeholderTextColor to match the dark mode text styling for improved readability.
• Ensured the search box background color adheres to the dark mode theme for a cohesive user experience.

Then added Testing Cases:

• Verified that the search bar text and placeholder are readable in both light and dark modes.
• Ensured no regressions in existing functionality.
• Manually tested the changes on both Android and iOS platforms.