chore: add husky + lint-staged pre-commit hook for oxfmt

Run oxfmt on staged ts/tsx/js/jsx/mjs/cjs/json/jsonc/md/mdx/yaml/yml/css/html
files before commit, preventing fmt:check failures in CI for cases that the
local pnpm fmt invocation hasn't caught.

- husky@9.1.7 + lint-staged@17.0.4 added as root devDependencies
- prepare script wires husky on pnpm install so contributors get the hook
- .husky/pre-commit runs `pnpm exec lint-staged`

Author: Erick Teowarang

.husky/pre-commit

@@ -0,0 +1 @@
+pnpm exec lint-staged

package.json

@@ -10,14 +10,20 @@
     "fmt": "oxfmt",
     "fmt:check": "oxfmt --check",
     "changeset:create": "changeset",
-    "changeset:publish": "pnpm build && changeset publish"
+    "changeset:publish": "pnpm build && changeset publish",
+    "prepare": "husky"
   },
   "devDependencies": {
     "@changesets/cli": "^2.31.0",
+    "husky": "9.1.7",
+    "lint-staged": "17.0.4",
     "oxfmt": "catalog:",
     "oxlint": "catalog:",
     "turbo": "^2.9.14"
   },
+  "lint-staged": {
+    "*.{ts,tsx,js,jsx,mjs,cjs,json,jsonc,md,mdx,yaml,yml,css,html}": "oxfmt"
+  },
   "engines": {
     "node": "24.x"
   },