Colour Picker for customization in appearance

[u21631532]

Feature Request: Add Appearance Customization with Color Picker in Settings

Is your feature request related to a problem? Please describe.

Our current Expo and React Native application lacks user-driven appearance customization options. This limitation leads to several issues:

• Users cannot personalize the app's look and feel to match their preferences
• The app may not be visually appealing or comfortable to use for all users, especially in different lighting conditions
• We're missing an opportunity to increase user engagement and satisfaction through personalization
• The app feels less modern compared to competitors that offer theme customization

Describe the solution you'd like

We propose adding an appearance customization feature in the settings page with the following elements:

1. Create a new "Appearance" or "Customize" section in the app's settings page

2. Implement a color picker feature:

   • Allow users to select custom colors for key UI elements (e.g., primary color, secondary color, background color)
   • Provide a visual preview of color changes in real-time
   • Include a reset option to revert to default colors

3. Add theme selection options:

   • Light theme
   • Dark theme
   • System default (follows device settings)
   • Custom theme (using colors selected with the color picker)

4. Implement additional customization options:

   • Font size adjustment (small, medium, large)
   • UI density settings (compact, normal, spacious)
   • Option to enable/disable animations

5. Create a theme preview section showing how different parts of the app will look with the selected settings

6. Implement a "Save and Apply" button to confirm changes

7. Ensure that chosen settings persist across app restarts

8. Add an option to export/import custom themes

Describe alternatives you've considered

• Limited preset themes instead of a full color picker: Easier to implement but less flexible for users
• System-wide appearance settings only: Simpler but doesn't allow for app-specific customization
• Separate theme store with downloadable themes: Could be a future expansion but more complex initially

Additional context

• We're using Expo and React Native for development
• Consider using a React Native compatible color picker library (e.g., react-native-color-picker)
• Ensure that all app components and screens adapt correctly to theme changes
• The customization should not negatively impact app performance
• Accessibility should be maintained across all custom color schemes (e.g., sufficient contrast ratios)
• Consider how custom themes will interact with other features like dark mode or dashboard visualizations