chore: upgrade tailwind to v4

vite.config.js

@@ -1,13 +1,13 @@
 import { defineConfig } from 'vite';
 import { sveltekit } from '@sveltejs/kit/vite';
 import devtoolsJson from 'vite-plugin-devtools-json';
+import tailwindcss from '@tailwindcss/vite';
 
-// @ts-expect-error process is a nodejs global
 const host = process.env.TAURI_DEV_HOST;
 
 // https://vitejs.dev/config/
 export default defineConfig(async () => ({
-  plugins: [sveltekit(), devtoolsJson()],
+  plugins: [tailwindcss(), sveltekit(), devtoolsJson()],
 
   // Vite options tailored for Tauri development and only applied in `tauri dev` or `tauri build`
   //