Replaced Constants.ContractType enum with integer property in EnvelopeType. Updated related references in EnvelopeEditorController. Removed EnvelopeType variable from ModuleSettings. Made EnvelopeType property bindable and initialized in frmEnvelopeMainData to improve consistency and simplify contract type management.
- Change ContractType property to use Constants.ContractType enum for improved type safety.
- Move EnvelopeType selection to a shared module-level variable for consistent access.
- Allow user selection of contract type when creating envelopes.
- Refine envelope validation to check for required elements per receiver, with improved error messages.
