Upgrade to React 19, MUI v7, Storybook 9

- React 18 → 19, MUI v5 → v7, Storybook 8 → 9
- Fix Grid v2 API in Footer (remove item prop, use size prop)
- Inline provider fixtures (was importing from excluded demo dir)
- Remove consolidated SB addons (essentials, storysource, blocks)
- Update addon-designs to SB9-compatible version
- Add autodocs via tags in preview config
- Add Tailwind v3, PostCSS, autoprefixer dev deps (config next)
- Zero TypeScript errors, Storybook starts clean

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

package.json

@@ -1,9 +1,9 @@
 {
   "name": "fa-design-system",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "private": true,
   "type": "module",
-  "description": "Funeral Arranger Design System — React + MUI + Storybook",
+  "description": "Funeral Arranger Design System — React 19 + MUI v7 + Storybook 9 + Tailwind v3",
   "scripts": {
     "dev": "vite",
     "build": "tsc && vite build",
@@ -17,53 +17,45 @@
     "format": "prettier --write 'src/**/*.{ts,tsx}'",
     "format:check": "prettier --check 'src/**/*.{ts,tsx}'",
     "test": "vitest run --passWithNoTests",
-    "test:watch": "vitest",
-    "chromatic": "chromatic --exit-zero-on-changes --build-script-name=build:storybook",
-    "demo:dev": "vite -c vite.demo.config.ts --mode arrangement",
-    "demo:build": "vite build -c vite.demo.config.ts",
-    "demo:publish": "npm run demo:build -- --mode arrangement && ./scripts/deploy-demo.sh arrangement",
-    "prepare": "husky"
+    "test:watch": "vitest"
   },
   "dependencies": {
     "@emotion/react": "^11.13.0",
     "@emotion/styled": "^11.13.0",
     "@googlemaps/markerclusterer": "^2.6.2",
-    "@mui/icons-material": "^5.16.0",
-    "@mui/material": "^5.16.0",
-    "@mui/system": "^5.16.0",
+    "@mui/icons-material": "^7.0.0",
+    "@mui/material": "^7.0.0",
+    "@mui/system": "^7.0.0",
     "@vis.gl/react-google-maps": "^1.8.3",
-    "react": "^18.3.0",
-    "react-dom": "^18.3.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "react-router-dom": "^7.14.1",
     "zustand": "^5.0.12"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.4",
-    "@playwright/mcp": "^0.0.68",
-    "@storybook/addon-a11y": "^8.6.14",
-    "@storybook/addon-designs": "^8.0.0",
-    "@storybook/addon-essentials": "^8.4.0",
-    "@storybook/addon-storysource": "^8.6.14",
-    "@storybook/blocks": "^8.4.0",
-    "@storybook/react": "^8.4.0",
-    "@storybook/react-vite": "^8.4.0",
+    "@storybook/addon-a11y": "^9.0.0",
+    "@storybook/addon-designs": "^9.0.0-next.3",
+    "@storybook/react": "^9.0.0",
+    "@storybook/react-vite": "^9.0.0",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
-    "@types/react": "^18.3.0",
-    "@types/react-dom": "^18.3.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^4.3.0",
-    "chromatic": "^11.29.0",
+    "autoprefixer": "^10.4.0",
     "eslint": "^9.39.4",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-jsx-a11y": "^6.10.2",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^7.0.1",
-    "husky": "^9.1.7",
     "jsdom": "^29.0.1",
     "lint-staged": "^16.4.0",
+    "postcss": "^8.4.0",
     "prettier": "^3.8.1",
-    "storybook": "^8.4.0",
+    "storybook": "^9.0.0",
     "style-dictionary": "^4.2.0",
+    "tailwindcss": "^3.4.0",
     "typescript": "^5.5.0",
     "typescript-eslint": "^8.57.2",
     "vite": "^5.4.0",