Fix: Dark mode country flags invisible in currency selection (#166)

[sathwikhbhat]

Description

This PR fixes the issue where country flags or associated text were not visible in dark mode on the currency selection screen. The solution applies Tailwind CSS classes (text-black dark:text-white) to the relevant div, ensuring proper text colour contrast in both light and dark modes.

Related Issue

Fixes #166

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to an existing feature)
• Breaking change (fix or feature that would cause existing functionality to change)
• Test (adds or updates tests only)
• Documentation (non-code change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

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[Copilot]

Pull Request Overview

This PR addresses a dark mode visibility issue where country flags or associated text were not visible on the currency selection screen. The fix applies appropriate Tailwind CSS classes for text color contrast in both light and dark modes. Additionally, the PR introduces a new 404 Not Found page with proper dark mode support and integrates it into the application's routing.

• Applied text-black dark:text-white classes to currency flag display for proper dark mode visibility
• Created a new NotFound component with full dark mode compatibility
• Added wildcard route to handle undefined paths

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
frontend/src/pages/SetupPage.jsx	Fixed dark mode visibility by adding text color classes to currency flag span
frontend/src/pages/NotFound.jsx	Created new 404 page component with dark mode support and navigation options
frontend/src/App.jsx	Added NotFound component import and wildcard route for unmatched paths

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[archa8]

LGTM!