fix: resolve TypeScript errors in vite.config.ts

- Install @types/node for node:path, node:process, node:url
- Import defineConfig from vitest/config for test config type
- Add types: ["node"] to tsconfig.json

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

package.json

@@ -23,6 +23,7 @@
     "@sveltejs/vite-plugin-svelte": "^7.1.2",
     "@tauri-apps/cli": "^2",
     "@testing-library/svelte": "^5.2.8",
+    "@types/node": "^26.6.2",
     "jsdom": "^26.1.0",
     "svelte": "^5.56.3",
     "svelte-check": "^4.6.0",