Add 'from_name' field to SMTP settings and update email sending logic

- Introduced a new 'from_name' field in the SMTP settings to allow users to specify a sender name.
- Updated the dashboard template to include an input for the sender name.
- Modified the email sending logic to format the 'From' header with the sender name if provided, enhancing email presentation.

app/main.py

@@ -482,6 +482,7 @@ def update_smtp_settings(
     username: str = Form(""),
     password: str = Form(""),
     from_email: str = Form(""),
+    from_name: str = Form(""),
     reply_to: str = Form(""),
     use_tls: str | None = Form(None),
     recipients: str = Form(""),
@@ -504,6 +505,7 @@ def update_smtp_settings(
     set_config(db, "smtp.username", username.strip())
     set_config(db, "smtp.password", password)
     set_config(db, "smtp.from_email", from_email.strip())
+    set_config(db, "smtp.from_name", from_name.strip())
     set_config(db, "smtp.reply_to", reply_to.strip())
     set_config(db, "smtp.use_tls", "true" if use_tls == "true" else "false")
     set_config(db, "smtp.recipients", recipients.strip())