chore: switch to tsdown

Author: idleberg

package.json

@@ -20,7 +20,7 @@
 		"README.md"
 	],
 	"scripts": {
-		"build": "tsup",
+		"build": "tsdown",
 		"dev": "npm run build -- --watch",
 		"lint": "biome check",
 		"prepack": "npm run build",
@@ -44,7 +44,7 @@
 		"@types/node": "^22.15.3",
 		"concurrently": "^9.2.1",
 		"lefthook": "^1.13.0",
-		"tsup": "^8.5.0",
+		"tsdown": "^0.15.1",
 		"typescript": "^5.9.2",
 		"vite": "^7.1.5"
 	},