fix: enable format on save with Prettier in VS Code (#24502)

- Set editor.formatOnSave to true
- Set Prettier as the default formatter
- ESLint continues to handle code quality via codeActionsOnSave
- Prettier handles all formatting with eslint-config-prettier disabling conflicting rules

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.vscode/settings.json

@@ -1,6 +1,7 @@
 {
   "typescript.tsdk": "node_modules/typescript/lib",
-  "editor.formatOnSave": false,
+  "editor.formatOnSave": true,
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
   "editor.codeActionsOnSave": {
     "source.fixAll.eslint": "explicit"
   },