core+gui: BBQR-only QR transfer, disable Audio when modem plugin unavailable
- Drop BALQR / BC-UR v1 / v2 wire formats, keep BBQR only (animated_qr, qrtransfer, dialogs); remove the settings "QR Code Size" selector and persist the export-dialog size choice instead. - Disable the Audio transport radio button in the import/export dialogs when the audio_modem plugin (or its amodem dependency) is unavailable. - Refresh translation catalogs (bal.pot, es_ES, it_IT).
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