feat: add branded Installer Studio desktop workspace

Closes #5

src/apps/desktop/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "msix-studio-desktop",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite --host 127.0.0.1 --port 1420 --strictPort",
+    "build": "tsc --noEmit && vite build",
+    "test": "node --experimental-strip-types --test tests/*.test.mjs",
+    "tauri": "tauri"
+  },
+  "dependencies": { "@tauri-apps/api": "^2.0.0" },
+  "devDependencies": { "@tauri-apps/cli": "^2.0.0", "typescript": "^5.9.0", "vite": "^7.0.0" }
+}