Update the AWB document generation to use landscape mode and adjust
the layout to utilize the additional horizontal space.
Key changes:
- Change `PdfService` orientation from portrait to landscape for AWB.
- Refactor `awb.blade.php` to use a side-by-side layout for terms
and signatures.
- Adjust grid column widths from 50% to 25% to accommodate the
new orientation.
- Update `@page` margin definitions for better print alignment.
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