chore: use vite for auto building @nodarium/ui instead of chokidar

We already use vite for building and during dev. Can use a custom vite
plugin to automatically package ui after every change, so no need for
chokidar.

packages/ui/vite.config.ts

@@ -1,9 +1,25 @@
 import { sveltekit } from '@sveltejs/kit/vite';
 import tailwindcss from '@tailwindcss/vite';
+import { exec } from 'node:child_process';
+import { readFileSync } from 'node:fs';
 import { defineConfig } from 'vitest/config';
 
+const postDevPackagePlugin = () => {
+  const packageContent = JSON.parse(readFileSync('./package.json', { encoding: 'utf8' }));
+  let timeout: ReturnType<typeof setTimeout> | undefined;
+  return {
+    name: 'run-command-on-change',
+    handleHotUpdate: () => {
+      clearTimeout(timeout);
+      timeout = setTimeout(function() {
+        exec(packageContent.scripts.package);
+      }, 200);
+    }
+  } as const;
+};
+
 export default defineConfig({
-  plugins: [tailwindcss(), sveltekit()],
+  plugins: [tailwindcss(), sveltekit(), postDevPackagePlugin()],
   test: {
     include: ['src/**/*.{test,spec}.{js,ts}']
   }