modernize

- replace vite with tsdown
- update registry
- update deps

tsdown.config.ts

@@ -0,0 +1,9 @@
+import { defineConfig } from "tsdown";
+
+export default defineConfig({
+	entry: ["./src/unom-style.ts", "./src/easings/easings.ts"],
+	format: "esm",
+	dts: true,
+	exports: true,
+	fixedExtension: false,
+});