chore: Update husky to modern v9+ syntax

Remove deprecated husky.sh shim from pre-commit hook and update
prepare script from 'husky install' to 'husky'.

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

Author: Gido Manders

.husky/pre-commit

@@ -1,4 +1 @@
-#!/bin/sh
-. "$(dirname "$0")/_/husky.sh"
-
 npx lint-staged

package.json

@@ -66,7 +66,7 @@
     "lint:test": "eslint tests",
     "release": "npm run tsc && np",
     "dev:publish": "./scripts/dev-publish.sh",
-    "prepare": "husky install"
+    "prepare": "husky"
   },
   "lint-staged": {
     "{src,tests}/**/*.{js,jsx,json,scss,ts,tsx}": [