Initial commit: FA Design System source files

Copy of the Funeral Arranger design system components, theme, tokens,
and Storybook config from the original Parsons project. Pre-upgrade
baseline with React 18, MUI v5, Storybook 8.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vitest.config.ts

@@ -0,0 +1,19 @@
+import { defineConfig } from 'vitest/config';
+import react from '@vitejs/plugin-react';
+import path from 'path';
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: 'jsdom',
+    include: ['src/**/*.test.{ts,tsx}'],
+    setupFiles: ['./src/test/setup.ts'],
+  },
+  resolve: {
+    alias: {
+      '@atoms': path.resolve(__dirname, 'src/components/atoms'),
+      '@molecules': path.resolve(__dirname, 'src/components/molecules'),
+      '@organisms': path.resolve(__dirname, 'src/components/organisms'),
+    },
+  },
+});