Add option to pause NFC while viewing a card

[il-Luca]

⚠️ This solution has been coded with the help of LLM and NOT tested on a real device. Exactly what is discouraged in https://github.com/CatimaLoyalty/Android/blob/main/CONTRIBUTING.md

❌ Therefore, the pull request can simply be declined without further discussion or put on hold until someone is capable of thoroughly testing it – no one will complain 🙂

😇 I couldn't resist experimenting with vibecoding to try fixing an issue that’s been bugging me, and that has been raised by others in the past (see #2158)

Problem

When displaying a loyalty card barcode, nearby NFC readers can interfere with barcode readers resulting in failed read – or accidental payments as described in #2158

Solution

Added an optional "Pause NFC" setting that temporarily suppresses NFC tag dispatch while viewing a card.
It uses NfcAdapter.enableReaderMode() with a no-op callback to intercept all NFC technologies (A, B, F, V, Barcode) without processing them. NFC behavior automatically restores when the card view is exited.
The code added to LoyaltyCardViewActivity.onResume() was "stolen" from https://stackoverflow.com/questions/78570610/disable-programmatically-nfc-while-my-app-is-open

Implementation

• Added android.permission.NFC permission and feature declaration
• Added "Pause NFC" toggle in Settings > Card view (default: off)
• Modified LoyaltyCardViewActivity.onResume() to enable reader mode when setting is active

[TheLastProject]

What's stopping you from testing it yourself? :)

[il-Luca]

@TheLastProject the fact that I have close to zero knowledge of software development and testing 😹
Given that, I wouldn't trust myself to test the app. But if "clueless beginner on one phone" is sufficient as a test, I can try. I just need a few weeks to learn the basics and find the time to do it