- Move sub-routes from /pastel/palettes/* and /pastel/accessibility/* to direct children of /pastel
- Update AppSidebar navigation links
- Update Pastel Navbar and Footer links
- Update Tailwind source directives in pastel/globals.css
- Remove intermediate page files
- Add Figlet text converter with font selection and history
- Add Pastel color palette generator and manipulation suite
- Add comprehensive Units converter with category-based logic
- Introduce AppShell with Sidebar and Header for navigation
- Modernize theme system with CSS variables and new animations
- Update project configuration and dependencies
