Bump to v0.19.0 (stable) (#1161)

package.json

 {
   "name": "dyad",
   "productName": "dyad",
-  "version": "0.19.0-beta.1",
+  "version": "0.19.0",
   "description": "Free, local, open-source AI app builder",
   "main": ".vite/build/main.js",
   "repository": {