Add OnlineSpace feature and improve view model handling

- Introduced `MyViewModel` in `App.xaml.cs` for direct access to `HomePageVM`.
- Updated `AppShell` to include a new tab for `OnlineSpaceD` and registered new routes.
- Enhanced `SongsManagementService` with nullable reference types and collection initializers.
- Streamlined data handling in `HomePageVM` and improved user interaction logic.
- Refined `ChatService` for better chat message and friend request management.
- Improved drag-and-drop operations in `MainPageD`, `PlaylistsPageD`, and `SingleSongShellPageD`.
- Added `OnlineSpaceD` for online interactions and chat functionality.
- Updated `DimmerWindow` initialization and user interaction handling.
- Enhanced project structure in `ParseLiveQuery.csproj` and improved WebSocket handling in `ParseLiveQueryClient.cs`.

Author: YBTopaz8

ParseLiveQuery/Parse/Infrastructure/Control/ParseSetOperation.cs

@@ -35,6 +35,10 @@ public object ConvertToJSON(IServiceHub serviceHub = default)
             return dictionary;
         }
 
+        if (Value == null)
+        {
+            return null;
+        }
         // Default behavior for unsupported types
         throw new ArgumentException($"Unsupported type for encoding: {Value?.GetType()?.FullName}");
     }

ParseLiveQuery/Parse/Infrastructure/Execution/ParseCommandRunner.cs

@@ -97,7 +97,7 @@ public async Task<Tuple<HttpStatusCode, IDictionary<string, object>>> RunCommand
         }
         else if (responseCode == 404)
         {
-            throw new ParseFailureException(ParseFailureException.ErrorCode.ERROR404, "Error 404");
+            throw new ParseFailureException(ParseFailureException.ErrorCode.ERROR404, "Error 404 " +response.Item1+ response.Item2);
         }
         if (responseCode == 410)
         {

ParseLiveQuery/ParseLiveQuery.csproj

@@ -42,13 +42,4 @@
     <PackageReadmeFile>ReleaseNotes.md</PackageReadmeFile>
   </PropertyGroup>
 
-  <ItemGroup>
-    <None Include="..\LICENSE">
-      <Pack>True</Pack>
-      <PackagePath></PackagePath>
-    </None>
-  </ItemGroup>
-
-
-
 </Project>

ParseLiveQuery/ParseLiveQueryClient.cs

@@ -143,18 +143,17 @@ public Subscription<T> Subscribe<T>(ParseQuery<T> query, string SubscriptionName
         _subscriptions.TryAdd(requestId, subscription);
 
         // Handle cases
-        if (IsConnected)
+        if (!IsConnected)
         {
-            SendSubscription(subscription);
+            ConnectIfNeeded();
         }
         else if (_userInitiatedDisconnect)
         {
             throw new InvalidOperationException("The client was explicitly disconnected and must be reconnected before subscribing");
         }
-        else
-        {
-            ConnectIfNeeded();
-        }
+        
+        SendSubscription(subscription);
+
         return subscription;
     }
 
@@ -170,6 +169,7 @@ public void ConnectIfNeeded()
                 break;
             case WebSocketClientState.Connecting:
             case WebSocketClientState.Connected:
+                _hasReceivedConnected=true;
                 break;
             default:
                 break;
@@ -248,6 +248,10 @@ public void Reconnect()
         _hasReceivedConnected = false;
         _webSocketClient = _webSocketClientFactory(_hostUri, new WebSocketClientCallback(this)); // Pass callback here
         _webSocketClient.Open();
+        if (_webSocketClient.State == WebSocketState.Open)
+        {
+            _hasReceivedConnected=true;
+        }
     }