[EC-303] Add warning when vault timeout is set to "Never" (#1976)

* Added to AppResources.resx the message warning the user about setting the lockout option to "Never"

* Added the condition to check the newly selected option on the vault timeout settings

* Changed the wording on the warning as to reflect the mobile version

* Changed the vault timeout modal to have the ability to cancel

* Simplified the reversion of value if the user cancels the change

src/App/Pages/Settings/SettingsPage/SettingsPageViewModel.cs

@@ -257,6 +257,17 @@ namespace Bit.App.Pages
                 }
                 var cleanSelection = selection.Replace("✓ ", string.Empty);
                 var selectionOption = _vaultTimeouts.FirstOrDefault(o => o.Key == cleanSelection);
+
+                // Check if the selected Timeout action is "Never" and if it's different from the previous selected value
+                if (selectionOption.Value == null && selectionOption.Value != oldTimeout)
+                {
+                    var confirmed = await _platformUtilsService.ShowDialogAsync(AppResources.NeverLockWarning,
+                        AppResources.Warning, AppResources.Yes, AppResources.Cancel);
+                    if (!confirmed)
+                    {
+                        return;
+                    }
+                }
                 _vaultTimeoutDisplayValue = selectionOption.Key;
                 newTimeout = selectionOption.Value;
             }

src/App/Resources/AppResources.Designer.cs

@@ -4034,5 +4034,13 @@ namespace Bit.App.Resources {
                 return ResourceManager.GetString("All", resourceCulture);
             }
         }
+
+        public static string NeverLockWarning
+        {
+            get
+            {
+                return ResourceManager.GetString("NeverLockWarning", resourceCulture);
+            }
+        }
     }
 }

src/App/Resources/AppResources.resx

@@ -2254,4 +2254,7 @@
   <data name="All" xml:space="preserve">
     <value>All</value>
   </data>
+  <data name="NeverLockWarning" xml:space="preserve">
+    <value>Setting your lock options to “Never” keeps your vault available to anyone with access to your device. If you use this option, you should ensure that you keep your device properly protected.</value>
+  </data>
 </root>