Add fromName field support to emails collection

- Add fromName field to Emails collection schema for sender display name
- Update BaseEmailDocument and QueuedEmail interfaces to include fromName
- Add SendEmailTaskInput support for fromName field in job tasks
- Update MailingService to combine fromName and from into proper "Name <email>" format
- Add fromName, from, and replyTo fields to job input schema for admin UI
- Update field copying logic to handle new sender-related fields

Users can now specify a display name for emails (e.g., "John Doe <john@example.com>").

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/collections/Emails.ts

@@ -49,6 +49,13 @@ const Emails: CollectionConfig = {
         description: 'Sender email address (optional, uses default if not provided)',
       },
     },
+    {
+      name: 'fromName',
+      type: 'text',
+      admin: {
+        description: 'Sender display name (optional, e.g., "John Doe" for "John Doe <john@example.com>")',
+      },
+    },
     {
       name: 'replyTo',
       type: 'text',