fix: update sst.desktop.config.ts to deploy packages/app instead of packages/desktop

The deployment was still pointing to the old packages/desktop (Tauri wrapper) instead of
packages/app (web UI). This caused 'Cannot read properties of undefined (reading os_type)'
errors when running 'shuvcode web' because the Tauri plugins don't work in browser context.

Author: shuv1337

sst.desktop.config.ts

@@ -18,7 +18,7 @@ export default $config({
 
     new sst.cloudflare.StaticSite("Desktop", {
       domain: "desktop." + domain,
-      path: "packages/desktop",
+      path: "packages/app",
       build: {
         command: "bun turbo build",
         output: "./dist",