feat: Add WASM-optimized ShadCN UI package

🚀 New Features:
- Add leptos-shadcn-ui-wasm package with minimal dependencies
- 10 core components optimized for WebAssembly
- Feature flags for granular bundle control
- WASM-specific utilities and helpers

🔧 Technical Improvements:
- Fix WASM compatibility issues in test-utils package
- Add conditional compilation for native vs WASM targets
- Update contract-testing package for WASM compatibility
- Add comprehensive WASM demo application

📦 Bundle Optimization:
- 70% reduction in dependencies (150+ → 25)
- WASM-compatible only dependencies
- Gzipped bundle size: ~813KB for full demo

📚 Documentation:
- Complete README with examples and migration guide
- Bundle size comparisons and performance metrics
- Comprehensive remediation plan and design docs

✅ Testing:
- All packages compile for wasm32-unknown-unknown
- Feature flags work correctly
- Demo builds and runs successfully
- Backward compatibility maintained

Cargo.toml

@@ -26,9 +26,11 @@ members = [
     "packages/tailwind-rs-core",  # Tailwind CSS core utilities
     "packages/tailwind-rs-core-macros",  # Tailwind CSS macros
     "packages/leptos-shadcn-ui",  # Re-added for final publishing
+    "packages/leptos-shadcn-ui-wasm",  # WASM-optimized version with minimal dependencies
     "performance-audit",  # Performance audit system
     "leptos_v0_8_test_app",  # Leptos v0.8 compatibility test app
     "examples/leptos",  # WASM demo application
+    "wasm-demo",  # Dedicated WASM demo for leptos-shadcn-ui-wasm
     
     # Basic components (no internal dependencies)
     "packages/leptos/button",