refactor: Use getCryptoIdentityState to check backup state

lib/pages/chat/events/message_content.dart

@@ -3,6 +3,7 @@ import 'dart:math';
 import 'package:flutter/material.dart';
 
 import 'package:go_router/go_router.dart';
+import 'package:matrix/encryption.dart';
 import 'package:matrix/matrix.dart';
 
 import 'package:fluffychat/config/setting_keys.dart';
@@ -57,7 +58,8 @@ class MessageContent extends StatelessWidget {
       return;
     }
     final client = Matrix.of(context).client;
-    if (client.isUnknownSession && client.encryption!.crossSigning.enabled) {
+    final state = await client.getCryptoIdentityState();
+    if (!state.connected) {
       final success = await context.push('/backup');
       if (success != true) return;
     }

lib/pages/device_settings/device_settings.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 import 'package:collection/collection.dart' show IterableExtension;
-import 'package:matrix/encryption/utils/key_verification.dart';
+import 'package:matrix/encryption.dart';
 import 'package:matrix/matrix.dart';
 import 'package:url_launcher/url_launcher_string.dart';
 
@@ -40,16 +40,10 @@ class DevicesSettingsController extends State<DevicesSettings> {
 
   void _checkChatBackup() async {
     final client = Matrix.of(context).client;
-    if (client.encryption?.keyManager.enabled == true) {
-      if (await client.encryption?.keyManager.isCached() == false ||
-          await client.encryption?.crossSigning.isCached() == false ||
-          client.isUnknownSession && !mounted) {
-        setState(() {
-          chatBackupEnabled = false;
-        });
-        return;
-      }
-    }
+    final state = await client.getCryptoIdentityState();
+    setState(() {
+      chatBackupEnabled = state.initialized && !state.connected;
+    });
   }
 
   void removeDevicesAction(List<Device> devices) async {

lib/pages/settings/settings.dart

@@ -6,6 +6,7 @@ import 'package:collection/collection.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:go_router/go_router.dart';
 import 'package:image_picker/image_picker.dart';
+import 'package:matrix/encryption.dart';
 import 'package:matrix/matrix.dart';
 
 import 'package:fluffychat/l10n/l10n.dart';
@@ -61,13 +62,12 @@ class SettingsController extends State<Settings> {
   }
 
   void logoutAction() async {
-    final noBackup = showChatBackupBanner == true;
     if (await showOkCancelAlertDialog(
           useRootNavigator: false,
           context: context,
           title: L10n.of(context).areYouSureYouWantToLogout,
           message: L10n.of(context).noBackupWarning,
-          isDestructive: noBackup,
+          isDestructive: cryptoIdentityConnected == false,
           okLabel: L10n.of(context).logout,
           cancelLabel: L10n.of(context).cancel,
         ) ==
@@ -167,23 +167,17 @@ class SettingsController extends State<Settings> {
     if (client.prevBatch == null) {
       await client.onSync.stream.first;
     }
-    final crossSigning =
-        await client.encryption?.crossSigning.isCached() ?? false;
-    final needsBootstrap =
-        await client.encryption?.keyManager.isCached() == false ||
-        client.encryption?.crossSigning.enabled == false ||
-        !crossSigning;
-    final isUnknownSession = client.isUnknownSession;
+
+    final state = await client.getCryptoIdentityState();
     setState(() {
-      showChatBackupBanner = needsBootstrap || isUnknownSession;
+      cryptoIdentityConnected = state.initialized && state.connected;
     });
   }
 
-  bool? crossSigningCached;
-  bool? showChatBackupBanner;
+  bool? cryptoIdentityConnected;
 
   void firstRunBootstrapAction([_]) async {
-    if (showChatBackupBanner != true) {
+    if (cryptoIdentityConnected == true) {
       showOkAlertDialog(
         context: context,
         title: L10n.of(context).chatBackup,

lib/pages/settings/settings_view.dart

@@ -22,7 +22,6 @@ class SettingsView extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
-    final showChatBackupBanner = controller.showChatBackupBanner;
     final activeRoute = GoRouter.of(
       context,
     ).routeInformationProvider.value.uri.path;
@@ -142,20 +141,13 @@ class SettingsView extends StatelessWidget {
               },
             ),
             Divider(color: theme.dividerColor),
-            if (showChatBackupBanner == null)
-              ListTile(
-                leading: const Icon(Icons.backup_outlined),
-                title: Text(L10n.of(context).chatBackup),
-                trailing: const CircularProgressIndicator.adaptive(),
-              )
-            else
-              SwitchListTile.adaptive(
-                controlAffinity: ListTileControlAffinity.trailing,
-                value: controller.showChatBackupBanner == false,
-                secondary: const Icon(Icons.backup_outlined),
-                title: Text(L10n.of(context).chatBackup),
-                onChanged: controller.firstRunBootstrapAction,
-              ),
+            SwitchListTile.adaptive(
+              controlAffinity: ListTileControlAffinity.trailing,
+              value: controller.cryptoIdentityConnected == true,
+              secondary: const Icon(Icons.backup_outlined),
+              title: Text(L10n.of(context).chatBackup),
+              onChanged: controller.firstRunBootstrapAction,
+            ),
             Divider(color: theme.dividerColor),
             ListTile(
               leading: const Icon(Icons.format_paint_outlined),