<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Upgraded the theme customization interface with a dropdown that lets
you choose from multiple themes (Light, Dark, Azure, Gray). Users can
now adjust options like text colors, background color, gradients, and
banner display more intuitively.
- Introduced a structured approach to theme variables, enhancing
compatibility and customization options.
- **Style**
- Enhanced the header’s visual presentation by introducing dynamic
background imagery and refined layout adjustments for a more polished
look.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Enhanced theme customization with new options for custom gradients,
delivering dynamic and visually cohesive banner effects.
- Improved header styling with refined color handling to adapt
seamlessly across both dark and light modes.
- Added new CSS variables for gradient management in theme definitions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: mdatelle <mike@datelle.net>
