Notifications registration (#8564)

* Formatting nits

* Debounce push token registration by 100ms

* Comment

* Align handling across native devices

* Clean up

* Simplify

* Use hooks

* Update import

* Comment

* Put app view DIDs in constants

* Clarify comment

src/platform/detection.ts

@@ -3,7 +3,6 @@ import {Platform} from 'react-native'
 export const isIOS = Platform.OS === 'ios'
 export const isAndroid = Platform.OS === 'android'
 export const isNative = isIOS || isAndroid
-export const devicePlatform = isIOS ? 'ios' : isAndroid ? 'android' : 'web'
 export const isWeb = !isNative
 export const isMobileWebMediaQuery = 'only screen and (max-width: 1300px)'
 export const isMobileWeb =