Add Tauri CLI, app icons, and packaging config.

Wire up local build scripts and lockfiles so the desktop app can be developed and bundled consistently.

package.json

@@ -6,7 +6,10 @@
   "scripts": {
     "dev": "vite",
     "build": "tsc -b && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "tauri": "tauri",
+    "tauri:dev": "tauri dev",
+    "tauri:build": "tauri build"
   },
   "dependencies": {
     "@tauri-apps/api": "^2.0.0",
@@ -14,6 +17,7 @@
     "react-dom": "^19.0.0"
   },
   "devDependencies": {
+    "@tauri-apps/cli": "^2.11.4",
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^5.0.0",