on email tab create a test email button to test smtp integration

package.json

@@ -48,6 +48,7 @@
     "genkit": "^1.14.1",
     "lucide-react": "^0.475.0",
     "next": "15.3.3",
+    "nodemailer": "^6.9.14",
     "patch-package": "^8.0.0",
     "react": "^18.3.1",
     "react-day-picker": "^8.10.1",
@@ -61,6 +62,7 @@
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.11",
     "@types/node": "^20",
+    "@types/nodemailer": "^6.4.15",
     "@types/react": "^18",
     "@types/react-dom": "^18",
     "genkit-cli": "^1.14.1",