- 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
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