- Initialize `currentDocument` and `currentReceiver` directly in constructor - Replace `Instance` with `pdfKit` for clearer naming - Remove redundant envelope/document loading in `init` - Update all method references to use `this.pdfKit`
- Initialize `currentDocument` and `currentReceiver` directly in constructor - Replace `Instance` with `pdfKit` for clearer naming - Remove redundant envelope/document loading in `init` - Update all method references to use `this.pdfKit`