feat: mobile security prefs (#1496)

* feat: move mobile-specific security items to Web when rendered in WebView

* feat: better UI for biometrics section

* feat: move Multitasking Privacy section to WebView (mostly UI)

* feat: move Multitasking Privacy section to WebView (going to understand why in WebView multitasking privacy value is auto-changed after reopening the WebView)

* feat: store MultitaskingPrivacy value as "NonWrapped" so that it's the same both on mobile and WebView

* feat: open WebView correctly when "Storage Encryption" is disabled on mobile

* fix: remove unnecessary changes and comments

* chore: revert ios-related unneeded changes

* fix: let Android to correctly recognize the NativeMobileWeb environment when opening WebView on Android

* fix: correct styles for the selected state of Biometrics/Passcode options

* chore: code cleanup

* fix: store Multitasking/Screenshot Privacy in the `Default` storage value mode

* chore: remove comment

* fix: use application's method instead of directly updating Screenshot Privacy preference

* fix: remove unused variable

* fix: use methods from Application and MobileDeviceInterface in all places, remove duplicate code

* fix: hide Multitasking Privacy and Biometrics Lock in WebView

Co-authored-by: Aman Harwara

packages/mobile/src/Lib/Interface.ts

@@ -12,6 +12,7 @@ import {
 } from '@standardnotes/snjs'
 import { Alert, Linking, Platform } from 'react-native'
 import FingerprintScanner from 'react-native-fingerprint-scanner'
+import FlagSecure from 'react-native-flag-secure-android'
 import Keychain from './Keychain'
 
 export type BiometricsType = 'Fingerprint' | 'Face ID' | 'Biometrics' | 'Touch ID'
@@ -295,6 +296,12 @@ export class MobileDeviceInterface implements DeviceInterface {
     await Keychain.clearKeys()
   }
 
+  async setAndroidScreenshotPrivacy(enable: boolean): Promise<void> {
+    if (Platform.OS === 'android') {
+      enable ? FlagSecure.activate() : FlagSecure.deactivate()
+    }
+  }
+
   openUrl(url: string) {
     const showAlert = () => {
       Alert.alert('Unable to Open', `Unable to open URL ${url}.`)