This commit adds several new layout customization features to the QR code label generator:
- Added support for vertical and horizontal offset in mm to shift the entire label grid
- Added adjustable label height (in mm) for better compatibility with various printers
- Added content scale (%), allowing QR code and text size to be fine-tuned
- Introduced a "Show Border" toggle to display label borders for alignment and calibration
These options allow precise tuning of the print layout for Avery L4731REV-25 sheets, improving print accuracy across different printers and paper feeds.
The README file was also updated to reflect the new functionality under the "Features" section, and the overall project description was improved for clarity.
