- Move watermark step after compress in processing pipeline to match
design doc order (resize, adjustments, convert, compress, metadata,
watermark, rename)
- Implement selective EXIF metadata stripping for Privacy and Custom
modes using little_exif tag filtering (GPS, camera, software,
timestamps, copyright categories)
- Add case conversion support to rename (none/lower/upper/title)
- Add regex find-and-replace on original filenames
- Wire case and regex controls in rename step UI to JobConfig
- Add regex crate dependency to pixstrip-core
