docs: add CHANGELOG.md with version 2.17.0 entry

Document the reversion from zxing-wasm to pure JavaScript PDF417 implementation due to barcode scanner compatibility issues at Tisak kiosks.

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.17.0] - 2025-12-21
+
+### Changed
+- **PDF417 Barcode Generation**: Reverted from zxing-wasm library to pure JavaScript implementation due to barcode scanner compatibility issues. The barcodes generated by the zxing-wasm library were unreadable by scanners at "Tisak" kiosks in Croatia. The legacy custom PDF417 generator now ensures better compatibility with retail payment scanning infrastructure.
+
+### Technical Details
+- Restored `app/lib/pdf/pdf417.ts` - Custom PDF417 generator library
+- Restored `app/lib/pdf/renderBarcode.ts` - Canvas-based barcode renderer
+- Restored `app/ui/Pdf417Barcode.tsx` - React component using custom generator
+- Updated all components to use legacy `Pdf417Barcode` instead of `Pdf417BarcodeWasm`
+
+## [2.16.1] - 2025-12-20
+
+### Fixed
+- Minor bug fixes and improvements
+
+## [2.16.0] - 2025-12-20
+
+### Added
+- Initial zxing-wasm integration for PDF417 barcode generation
+
+---
+
+For older versions, please refer to git commit history.