CW-974: Add support for automatic node switching. (#2361)

* feat: Add support for automatic node switching.

This change:
- Adds isTrustedNodeForSwitching property to Node class.
- Adds UI Checkbox to mark a node as trusted for automatic switching in Node create or edit form.
- Implements checkNodeHealth method in wallet classes to verify node connectivity.
- Adds NodeSwitchingService for managing automatic node switching based on health checks.
- Adds setting option for user to enable/disable automated node switching

* fix(automatic-node-switch): Set node health check interval to 5 minutes in NodeSwitchingService

* refactor: Update handler method

* feat: Automatic Node Switching Improvements

This change:
- Moves enable automatic node switch to the Manage Nodes Page
- Adds check to verify node health before attempting to sync in EVM, Sol and Tron Wallets.
- Modifies trusted ndoes list for monero
- Adds trigger for Node Health Check when app resumes from background

* fix: Increase default request timeout for Tron and update health check interval for node switch

* feat: Enhance Node health check functionality.

This change adds additional checks for token balance in EVM, Solana and Tron Wallets in checkNodeHealth.

* fix: Update health check interval to 30 seconds in NodeSwitchingService

* Update bitcoin_electrum_server_list.yml

* fix: Electru wallet not connecting to new node after switching

* fix: Automated Node Switch not working on Decred Wallet

* fix: Add more nodes for AutoSwitching

This change:
- Enables more nodes across wallet types for auto switching
- Modifies CTA for checkbox
- Renames flags to fit

* fix: Add migration function for setting up default nodes for autoswitching

* fix: Review and testing fixes

* chore: Adjust balance and history fetch timer

lib/src/screens/nodes/widgets/node_form.dart

@@ -32,6 +32,7 @@ class NodeForm extends StatelessWidget {
         ..setLogin((editingNode!.login ?? ''))
         ..setSSL((editingNode!.isSSL))
         ..setTrusted((editingNode!.trusted))
+        ..setIsEnabledForAutoSwitching((editingNode!.isEnabledForAutoSwitching))
         ..setSocksProxy((editingNode!.useSocksProxy))
         ..setSocksProxyAddress((editingNode!.socksProxyAddress ?? ''));
     }
@@ -153,6 +154,25 @@ class NodeForm extends StatelessWidget {
             ),
           ),
           SizedBox(height: 10.0),
+          Padding(
+            padding: EdgeInsets.only(top: 20),
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.start,
+              mainAxisSize: MainAxisSize.max,
+              children: [
+                Observer(
+                  builder: (_) => StandardCheckbox(
+                    value: nodeViewModel.isEnabledForAutoSwitching,
+                    borderColor: Theme.of(context).colorScheme.surfaceContainerHighest,
+                    iconColor: Theme.of(context).colorScheme.primary,
+                    onChanged: (value) => nodeViewModel.isEnabledForAutoSwitching = value,
+                    caption: S.current.enable_for_auto_switching,
+                  ),
+                ),
+              ],
+            ),
+          ),
+          SizedBox(height: 10.0),
           if (nodeViewModel.hasAuthCredentials) ...[
             Row(
               children: <Widget>[

lib/src/screens/root/root.dart

@@ -2,8 +2,10 @@ import 'dart:async';
 import 'dart:io';
 import 'package:cake_wallet/bitcoin/bitcoin.dart';
 import 'package:cake_wallet/core/auth_service.dart';
+import 'package:cake_wallet/core/node_switching_service.dart';
 import 'package:cake_wallet/core/totp_request_details.dart';
 import 'package:cake_wallet/core/trade_monitor.dart';
+import 'package:cake_wallet/di.dart';
 import 'package:cake_wallet/utils/device_info.dart';
 import 'package:cake_wallet/view_model/link_view_model.dart';
 import 'package:cw_core/utils/print_verbose.dart';
@@ -29,6 +31,7 @@ class Root extends StatefulWidget {
     required this.authService,
     required this.linkViewModel,
     required this.tradeMonitor,
+    required this.nodeSwitchingService,
   }) : super(key: key);
 
   final AuthenticationStore authenticationStore;
@@ -38,6 +41,7 @@ class Root extends StatefulWidget {
   final Widget child;
   final LinkViewModel linkViewModel;
   final TradeMonitor tradeMonitor;
+  final NodeSwitchingService nodeSwitchingService;
 
   @override
   RootState createState() => RootState();
@@ -161,6 +165,10 @@ class RootState extends State<Root> with WidgetsBindingObserver {
         }
 
         widget.tradeMonitor.resumeTradeMonitoring();
+
+        // Trigger node health check when app resumes
+        widget.nodeSwitchingService.performHealthCheck();
+
         break;
       default:
         break;

lib/src/screens/settings/manage_nodes_page.dart

@@ -2,6 +2,7 @@ import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/routes.dart';
 import 'package:cake_wallet/src/screens/base_page.dart';
 import 'package:cake_wallet/src/screens/nodes/widgets/node_list_row.dart';
+import 'package:cake_wallet/src/screens/settings/widgets/settings_switcher_cell.dart';
 import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
 import 'package:cake_wallet/src/widgets/standard_list.dart';
 import 'package:cake_wallet/utils/show_pop_up.dart';
@@ -34,7 +35,23 @@ class ManageNodesPage extends BasePage {
               onTap: (_) async => await Navigator.of(context).pushNamed(Routes.newNode),
             ),
           ),
-          SizedBox(height: 20),
+          Observer(
+            builder: (_) => SettingsSwitcherCell(
+              key: ValueKey('manage_nodes_page_enable_auto_node_switching_button_key'),
+              title: S.current.enable_auto_node_switching,
+              value: isPow
+                  ? powNodeListViewModel!.enableAutomaticNodeSwitching
+                  : nodeListViewModel!.enableAutomaticNodeSwitching,
+              onValueChange: (BuildContext context, bool value) {
+                if (isPow) {
+                  powNodeListViewModel!.setEnableAutomaticNodeSwitching(value);
+                } else {
+                  nodeListViewModel!.setEnableAutomaticNodeSwitching(value);
+                }
+              },
+            ),
+          ),
+          SizedBox(height: 8),
           Observer(
             builder: (BuildContext context) {
               int itemsCount =

lib/src/screens/settings/other_settings_page.dart

@@ -36,22 +36,22 @@ class OtherSettingsPage extends BasePage {
               if (_otherSettingsViewModel.displayTransactionPriority)
                 _otherSettingsViewModel.walletType == WalletType.bitcoin ?
                   SettingsPriorityPickerCell(
-                    title: S.current.settings_fee_priority,
-                    items: priorityForWalletType(_otherSettingsViewModel.walletType),
-                    displayItem: _otherSettingsViewModel.getDisplayBitcoinPriority,
-                    selectedItem: _otherSettingsViewModel.transactionPriority,
-                    customItemIndex: _otherSettingsViewModel.customPriorityItemIndex,
-                    onItemSelected: _otherSettingsViewModel.onDisplayBitcoinPrioritySelected,
-                    customValue: _otherSettingsViewModel.customBitcoinFeeRate,
-                    maxValue: _otherSettingsViewModel.maxCustomFeeRate?.toDouble(),
+                        title: S.current.settings_fee_priority,
+                        items: priorityForWalletType(_otherSettingsViewModel.walletType),
+                        displayItem: _otherSettingsViewModel.getDisplayBitcoinPriority,
+                        selectedItem: _otherSettingsViewModel.transactionPriority,
+                        customItemIndex: _otherSettingsViewModel.customPriorityItemIndex,
+                        onItemSelected: _otherSettingsViewModel.onDisplayBitcoinPrioritySelected,
+                        customValue: _otherSettingsViewModel.customBitcoinFeeRate,
+                        maxValue: _otherSettingsViewModel.maxCustomFeeRate?.toDouble(),
                   ) :
                   SettingsPickerCell(
-                    title: S.current.settings_fee_priority,
-                    items: priorityForWalletType(_otherSettingsViewModel.walletType),
-                    displayItem: _otherSettingsViewModel.getDisplayPriority,
-                    selectedItem: _otherSettingsViewModel.transactionPriority,
-                    onItemSelected: _otherSettingsViewModel.onDisplayPrioritySelected,
-                  ),
+                        title: S.current.settings_fee_priority,
+                        items: priorityForWalletType(_otherSettingsViewModel.walletType),
+                        displayItem: _otherSettingsViewModel.getDisplayPriority,
+                        selectedItem: _otherSettingsViewModel.transactionPriority,
+                        onItemSelected: _otherSettingsViewModel.onDisplayPrioritySelected,
+                      ),
               if (_otherSettingsViewModel.changeRepresentativeEnabled)
                 SettingsCellWithArrow(
                   title: S.current.change_rep,