A11y: StopSearchScreen - Calculate background color to improve text contrast

[ksharma-xyz]

TL;DR

Added color adjustment utilities and improved the SearchStopScreen's gradient background with dynamic light/dark theme support.

What changed?

• Added brighten and darken color utility functions for adjusting color lightness
• Updated SearchStopScreen's gradient background to dynamically adjust based on theme
• Modified StopSearchListItem to accept a text color parameter
• Switched to ImmutableList for transport mode types
• Added comprehensive preview variations for different transport modes

How to test?

1. Navigate to the SearchStopScreen in both light and dark themes
2. Verify the gradient background adjusts appropriately for each theme
3. Check that stop search results are displayed with correct text colors
4. Confirm the gradient transitions smoothly with the surface color
5. Test with different transport modes to ensure correct color handling

Why make this change?

To improve readability and visual consistency across themes while maintaining proper contrast ratios. The dynamic color adjustments ensure optimal visibility of content regardless of the selected transport mode or theme.

Screenshots

Screenshots

[ksharma-xyz]

• A11y: StopSearchScreen - Calculate background color to improve text contrast #305 👈
• UI: Adjust bottom padding in UsualRideScreen #304
• main

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