Added FOCUS-57813 - Student-Specific File Attachments for Email Communications

Enhances the Communication module by allowing email messages to include files stored in Student File Upload fields.

When composing an email, users can select one or more student file upload fields to include as attachments. During processing, Focus automatically retrieves the appropriate file from each recipient's student record and attaches it to that recipient's email. This allows districts to send individualized documents--such as report cards, permission forms, or student-specific paperwork--to multiple families in a single communication while ensuring each recipient receives only their own student's files.

Standard file attachments continue to be supported and can be included alongside student-specific attachments. This functionality is currently available for email communications and does not apply to Announcements or Communication Templates.