Updated the pdfjs-annotation-extension-testdata.json to set default dimensions for konvaClientRect to zero. Added a HASH_PARAMS implementation in viewer.html to handle hash parsing, ensuring compatibility with the pdfjs-annotation-extension bundle and preventing runtime errors.
Refactored the module export structure in pdfjs-annotation-extension.js to ensure compatibility with various module systems, enhancing the integration of the PdfjsAnnotationExtension across different environments.