Fix packaging scans that are ignored

Open a box and clear the invalid-QR popup so the packaging scan listener accepts your scans.

1. The packaging scan listener only accepts scans under specific conditions, and it tells you why instead of silently dropping the scan.

   ✓ Am 21. Oktober 2026 im Produkt geprüft

   

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2. Scans are ignored when no box is open (open or create a box first — the hardware scanner only attaches while a box is open).

   ✓ Am 21. Oktober 2026 im Produkt geprüft

3. Scans are ignored when a previous invalid scan hasn't been cleared (close the invalid-QR popup first).

   ✓ Am 21. Oktober 2026 im Produkt geprüft

   

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