ENG-1305 Add Prettier format-on-save via pre-commit hook (#865)

Author: maparent

.husky/pre-commit

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

package.json

@@ -7,9 +7,12 @@
     "dev": "turbo dev",
     "lint": "turbo lint",
     "deploy": "turbo deploy",
-    "format": "prettier --write \"**/*.{ts,tsx,md}\""
+    "format": "prettier --write \"**/*.{ts,tsx,md}\"",
+    "prepare": "husky"
   },
   "devDependencies": {
+    "husky": "^9.1.7",
+    "lint-staged": "^16.3.2",
     "prettier": "^3.6.0",
     "prettier-plugin-gherkin": "^3.1.3",
     "prettier-plugin-tailwindcss": "^0.6.13",
@@ -30,6 +33,9 @@
     ],
     "tailwindConfig": "./packages/tailwind-config/tailwind.config.ts"
   },
+  "lint-staged": {
+    "*.{ts|tsx|md}": "prettier -w"
+  },
   "dependencies": {
     "posthog-js": "catalog:"
   }