Add support for "from_name" field in email notifications

Introduced a new optional "from_name" attribute to email settings, allowing customization of the sender's display name in outgoing emails. Updated backend models, APIs, and front-end components to include and handle this field properly. This enhances email clarity and personalization for users.

backend/app/services/alert_notifications.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import asyncio
 from datetime import datetime, timedelta, timezone
 from email.message import EmailMessage
+from email.utils import formataddr
 import smtplib
 import ssl
 
@@ -21,6 +22,7 @@ async def _smtp_send(
     port: int,
     username: str | None,
     password: str | None,
+    from_name: str | None,
     from_email: str,
     recipient: str,
     subject: str,
@@ -30,7 +32,7 @@ async def _smtp_send(
 ) -> None:
     def _send() -> None:
         message = EmailMessage()
-        message["From"] = from_email
+        message["From"] = formataddr((from_name, from_email)) if from_name else from_email
         message["To"] = recipient
         message["Subject"] = subject
         message.set_content(body)
@@ -132,6 +134,7 @@ async def process_target_owner_notifications(db: AsyncSession, status: AlertStat
                         port=settings.smtp_port,
                         username=settings.smtp_username,
                         password=password,
+                        from_name=settings.from_name,
                         from_email=settings.from_email,
                         recipient=recipient,
                         subject=subject,