Add background push-notification on Android App

[Reckless-Satoshi]

Add background push-notification on Android App

[shyfire131]

Short update on notifications.

Looks like react-native-notifications doesn't support local notifications on Android - https://github.com/wix/react-native-notifications/blob/c877f54c8a8df713536479a2cdf740a11be966ce/README.md?plain=1#L38

It also looks like react-native-push-notifications isn't really maintained anymore - last commit was 2 years ago and maintainer says he has stopped.

"notifee" seems to be the new kid on the block and actively maintained so I'll be evaluating that. It has a paid for vibe but is FOSS as of September (Apache)

https://github.com/invertase/notifee

[shyfire131]

Update: will be using react-native-background-actions for the background order status polling.

Current thinking:

• The background service runs in its own HeadlessJS context, and the code must reside in /mobile i.e. the React Native project
• However, the polling frequencies are currently defined in frontend/src/contexts/AppContext.ts#L38
• Since an order could undergo multiple state changes while the app is backgrounded, the background service needs to be aware of the dynamic polling frequencies.
• As far as I can tell, this is the first time that logic (at the very least this table of polling constants, possibly more) needs to be shared across both the React App and the React Native subprojects
• Currently experimenting with a /shared top level folder for this purpose