OCR fixes and signature improvements:
- OCR no longer stalls on long scanned documents: pages are rendered one at a time as recognition reaches them, instead of every page being held in memory before it starts.
- OCR renders at the scan's own resolution, up to 300 DPI, rather than always upscaling to 300 — same results, far less memory on long documents.
- Adjustable interface size (View - Interface Size, 100% to 200%), for desktops running a large system font. Scales the interface only; the document keeps its own zoom.
- New reading aids for low vision: View - Page Appearance offers inverted lightness (dark pages with light text, hues preserved) and high contrast. Display only; saving and printing are unaffected.
- Apply a signature, stamp or image to every page at once from its right-click menu, repeated at the same position.
- Uploading a photo or scan of a signature now removes the white paper background automatically, so it doesn't sit in a white box over the document. It adapts to the image, handling cream paper and uneven lighting.
- Adjust the opacity of a placed signature or stamp so it can sit over existing text without hiding it.
