- Create merge.worker.js and alternate-merge.worker.js for offloading PDF merge operations to background threads
- Migrate merge and alternate-merge logic to use Web Worker architecture for improved performance
- Move flatten tool from singlePdfLoadTools to multiFileTools configuration
- Update merge and alternate-merge tool subtitles to indicate bookmark preservation
- Refactor alternate-merge.ts to use Web Worker instead of pdf-lib for interleaving operations
- Refactor merge.ts to use Web Worker for standard merge operations
- Update fileHandler.ts to recognize flatten as a multi-file tool requiring process button handling
- Simplify form-creator.ts and flatten.ts implementations with Web Worker integration
- Update UI state management to support Web Worker-based PDF processing
- Improve performance by moving computationally intensive PDF operations off the main thread
- Refactor date field UI rendering to use inline HTML with calendar icon and format text
- Consolidate date format and keystroke action creation by removing unnecessary widget loop
- Attach Additional Actions (AA) directly to field dictionary instead of individual widgets
- Improve code clarity and reduce redundant DOM manipulation in date field initialization
- Ensure date formatting and keystroke validation work correctly at the field level in generated PDFs
