chore: Update account deletion email copy (#12317)

Update the email copies for account deletion emails 

## Manual Deletion 

<img width="1378" height="678" alt="Screenshot 2025-08-29 at 2 41 40 PM"
src="https://github.com/user-attachments/assets/63d7ad97-ad51-4a8b-9ef3-d427fa467f8a"
/>

## Inactive Deletion

<img width="2946" height="1808" alt="image"
src="https://github.com/user-attachments/assets/bb50d08c-8701-4f93-af29-0b1d948a4009"
/>

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

enterprise/app/models/enterprise/account.rb

@@ -4,10 +4,22 @@ module Enterprise::Account
   def manually_managed_features; end
 
   def mark_for_deletion(reason = 'manual_deletion')
-    result = custom_attributes.merge!('marked_for_deletion_at' => 7.days.from_now.iso8601, 'marked_for_deletion_reason' => reason) && save
+    reason = reason.to_s == 'manual_deletion' ? 'manual_deletion' : 'inactivity'
+
+    result = custom_attributes.merge!(
+      'marked_for_deletion_at' => 7.days.from_now.iso8601,
+      'marked_for_deletion_reason' => reason
+    ) && save
 
     # Send notification to admin users if the account was successfully marked for deletion
-    AdministratorNotifications::AccountNotificationMailer.with(account: self).account_deletion(self, reason).deliver_later if result
+    if result
+      mailer = AdministratorNotifications::AccountNotificationMailer.with(account: self)
+      if reason == 'manual_deletion'
+        mailer.account_deletion_user_initiated(self, reason).deliver_later
+      else
+        mailer.account_deletion_for_inactivity(self, reason).deliver_later
+      end
+    end
 
     result
   end