<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- New Features
- Built-in Then-style DSL for fluent configuration.
- Centralized theming via a new resources library exposing standardized
colors and icons for SwiftUI and UIKit.
- Refactor
- Migrated color and icon accessors to the new resources provider.
- Removed redundant imports and streamlined UI configuration.
- Dependencies
- Updated MarkdownView to 3.4.2.
- Removed the Then third-party dependency; updated package sources;
added resources package and assets.
- Documentation
- Added iOS Swift code style and architecture guidelines.
- Chores
- Updated Xcode project format and repository ignore rules.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
