Complete Phase 1: React modernization foundation

- Initialize Vite + React 19 + TypeScript project
- Configure Tailwind CSS v4 with design tokens
- Add Button component (13 tests)
- Add Card component (11 tests)
- Add Container component (9 tests)
- Add Header component with glassmorphism (17 tests)
- Add Footer component (13 tests)
- Add MobileNav with slide-out menu (19 tests)
- Update App.tsx with layout preview

82 tests passing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?