Add a handy precommit script to browser-extension.

Author: nedtwigg

browser-extension/package.json

@@ -41,6 +41,7 @@
     "build": "wxt build",
     "build:dev": "wxt build --mode development",
     "build:firefox": "wxt build -b firefox",
+    "precommit": "npm run biome:fix && npm run typecheck && npm run test",
     "typecheck": "tsc --noEmit",
     "dev": "wxt",
     "dev:firefox": "wxt -b firefox",