Add "+ Scan NFC" option in the Targeted Payloads menu.
Scans Mifare Ultralight NDEF tags, decodes the encoded
ESL ID, and auto-creates the target — no manual barcode
entry needed. Cyan LED blinks during scan. Loops until
a tag is found or the user presses Back.
New files:
- nfc/tagtinker_nfc.c/.h — NDEF URI decoder module
- scenes/tagtinker_scene_nfc_scan.c — NFC scan scene
Version bumped to 2.1, NFC credit added to About screen.
