feat: scaffold Tauri v2 + Svelte 5 project with base layout and utilities

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main.ts

@@ -0,0 +1,10 @@
+import { mount } from 'svelte';
+import App from './App.svelte';
+import './app.css';
+
+const target = document.getElementById('app');
+if (!target) {
+  throw new Error('Missing #app mount target');
+}
+
+mount(App, { target });