v1.2.2 — Smart Duplex Orientation

Smart Duplex: Auto-detect document orientation for correct binding

What changed

• Duplex binding now auto-detects document orientation from the PDF's MediaBox instead of relying on the printer's default paper size
• Portrait documents → two-sided-long-edge (book-style flip left/right)
• Landscape documents → two-sided-short-edge (book-style flip left/right)
• Falls back to long-edge (portrait) if orientation detection fails
• Zero new dependencies — reads first 8KB of the PDF with a lightweight regex

What it fixes

• Previously hardcoded two-sided-short-edge caused portrait duplex prints to have the back page upside-down — not the expected book-style behavior

Tested on

• HP Color LaserJet Pro M478f — both portrait and landscape A4 duplex confirmed correct ✅