distribute CSS files + allow importing from 'hyperparam'

Author: severo

package.json

@@ -11,6 +11,10 @@
   },
   "type": "module",
   "exports": {
+    ".": {
+      "types": "./lib/index.d.ts",
+      "import": "./lib/index.js"
+    },
     "./*": "./lib/*"
   },
   "bin": {
@@ -26,6 +30,7 @@
     "build:ts": "tsc -b",
     "build:vite": "vite build",
     "build": "run-s build:ts build:vite",
+    "postbuild": "copyfiles -u 1 src/**/*.css lib/",
     "coverage": "vitest run --coverage --coverage.include=src --coverage.include=bin",
     "dev": "run-p -l watch:ts watch:vite watch:serve",
     "lint": "eslint .",
@@ -54,6 +59,7 @@
     "@types/react-dom": "19.0.3",
     "@vitejs/plugin-react": "4.3.4",
     "@vitest/coverage-v8": "3.0.7",
+    "copyfiles": "2.4.1",
     "eslint": "9.21.0",
     "eslint-plugin-react": "7.37.4",
     "eslint-plugin-react-hooks": "5.1.0",