feat: Complete shadcn/ui components implementation with 60+ production-ready components

[christoph2806]

Complete shadcn/ui Components Implementation

Summary

This PR implements a comprehensive set of 60+ production-ready shadcn/ui components for the UI kit, providing a complete foundation for modern React applications with proper TypeScript support, accessibility features, and consistent styling.

Changes Made

Core Components Implemented

• Form Components: InputOTP, Input, Label, Textarea, Select, Checkbox, RadioGroup, Switch, Slider
• Layout Components: Accordion, Collapsible, AspectRatio, Card, Separator, ScrollArea, Resizable
• Navigation Components: Breadcrumb, Menubar, NavigationMenu, Pagination, Tabs
• Feedback Components: Alert, AlertDialog, Dialog, Drawer, HoverCard, Popover, Tooltip, Toast
• Data Display: Avatar, Badge, Table, Calendar, Command, ContextMenu, DropdownMenu
• Advanced Components: Command palette, Chart components, Carousel, DataTable, Sonner integration

Key Features

• ✅ Full TypeScript support with proper type definitions
• ✅ Accessibility (a11y) compliant with ARIA attributes
• ✅ Consistent styling using Tailwind CSS and CSS variables
• ✅ Responsive design support
• ✅ Dark mode compatibility
• ✅ Compound component patterns where appropriate
• ✅ Comprehensive documentation and examples
• ✅ Export barrel for easy imports

Technical Improvements

• Proper component composition with forwardRef for DOM manipulation
• Consistent prop interfaces across all components
• Optimized bundle size with tree-shaking support
• Integration with React Hook Form for form components
• Radix UI primitives for robust foundation

Testing

• All components tested with Vitest
• Accessibility testing included
• TypeScript compilation verified
• Bundle size within acceptable limits

DoD Criteria Met

• All 60+ components implemented with proper TypeScript types
• Components follow shadcn/ui design patterns and conventions
• Full accessibility compliance (ARIA attributes, keyboard navigation)
• Comprehensive documentation for each component
• Bundle size optimized and within limits
• All tests passing
• TypeScript compilation successful
• Linting rules passed

Related Task

Implements Task 1 from project plan: Complete shadcn/ui components implementation

Breaking Changes

None - this is a new feature implementation

Migration Guide

No migration needed - all new components with proper exports