Add presubmit checks to CI (#113)

package.json

@@ -23,6 +23,9 @@
     "db:generate": "drizzle-kit generate",
     "db:push": "drizzle-kit push",
     "db:studio": "drizzle-kit studio",
+    "prettier:check": "npx prettier --check .",
+    "prettier": "npx prettier --write .",
+    "presubmit": "npm run prettier:check && npm run lint",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:ui": "vitest --ui",