ZapBox - v944368 - NFC Card Emulation

✨ Features (Both Versions)

• NFC Card Emulation (experimental): ZapBox emulates an NFC tag — customers can pay by tapping a phone (Phoenix Wallet tested, LUD-17 format recommended)
• NFC Bolt Card: Default mode changed to boltcard; faster mode switching (readPassiveTargetID timeout 1s instead of 30s)
• Both-mode 3-state cycle: QR → Bolt Card → Ticker → QR

🔧 Bug Fixes & Improvements

• I2C read retry on first APDU failure (2ms pause, second read succeeds)
• Fast-fail backoff after 3 consecutive APDU failures (3s cooldown + bus recovery)
• Dynamic APDU threshold based on NDEF size (LUD-17: 7 APDUs = 100% success, bech32: 8 APDUs = ~75%)
• I2C at 400kHz, bus recovery, ndefFullyRead tracking for reliable emulation
• Zero-cost LOG_DEBUG macro; internet check deferred during NFC session
• Installer: NFC Bolt Card explanation text added to headless web installer

📦 Firmware

Version	Target	Chip
v944368	T-Display-S3	ESP32-S3
v944368h	Headless ESP32 Dev	ESP32