Branding: screenshot alignment, border, and side-by-side step layout #289

Will be implemented as branding options.

Image alignment in PDF. Currently, there is no option to center an image on the PDF page. Adding image alignment options (left, center, right) would provide more flexibility when formatting documents.

Screenshot border. It would be very useful to have the option to add a border around screenshots. This would help visually distinguish screenshots from the document background and improve overall readability.

Side-by-side layout (image and text). It would be great to have the option to arrange screenshots and their corresponding text side by side, in a two-column or grid layout.

All three should be options in Settings → Branding (brand profile), off by default.