feat(frontend): add xstate vscode extension (#166)

Author: gregory-j-baker

frontend/.vscode/extensions.json

@@ -1,10 +1,11 @@
 {
   "recommendations": [
-    "vitest.explorer",
-    "ms-playwright.playwright",
     "bradlc.vscode-tailwindcss",
-    "esbenp.prettier-vscode",
     "dbaeumer.vscode-eslint",
+    "esbenp.prettier-vscode",
+    "ms-playwright.playwright",
+    "statelyai.stately-vscode",
+    "vitest.explorer",
     "yoavbls.pretty-ts-errors"
   ]
 }