Create Detox Tests for Dark Mode Theme Switching

[manideepk90]

Add Detox E2E tests for dark/light theme functionality

Create comprehensive Detox test cases for theme switching across the
payment flow:

Test Cases to Implement:

1. Theme Toggle Functionality

   • Light to dark mode switching
   • Dark to light mode switching
   • Theme persistence across app restarts
   • System theme following (if supported)

2. Payment Flow Theme Consistency

   • Payment form in dark mode
   • Payment form in light mode
   • Success screen theming
   • Error states in both themes

3. Component Theme Validation

   • Button colors and states
   • Input field appearances
   • Text contrast ratios
   • Background color changes

4. Cross-Platform Theme Testing

   • Android theme switching
   • iOS appearance mode handling
   • Web theme persistence

Expected Outcome:

• Comprehensive theme testing coverage
• Visual regression prevention
• Theme consistency validation

Files to Create:

• detox-tests/e2e/themes/themeToggle.test.js
• detox-tests/e2e/themes/paymentFlowThemes.test.js
• detox-tests/helpers/themeHelpers.js
• detox-tests/utils/themeAssertions.js

Acceptance Criteria:

• Theme toggle works in all screens
• Payment flow maintains theme consistency
• Theme persists across app sessions
• All UI components respect theme changes
• No visual glitches during theme switching
• Accessibility contrast maintained in both themes