Add better support for handling disconnection at the ranked play queue screen

[peppy]

Until now the queue screen basically did nothing to let the user knowing they were disconnected from the server. Now the various components will correctly clear state and show a roughly competent "i'm trying to reconnect" state.

osu.2026-05-07.at.06.15.02.mp4

---

Can be tested using the following patch (hit F7 to reconnect, with a 5 second delay to show the disconnected state too):

diff --git a/osu.Game/Online/PersistentEndpointClientConnector.cs b/osu.Game/Online/PersistentEndpointClientConnector.cs
index 7064906be4..ae539aba8d 100644
--- a/osu.Game/Online/PersistentEndpointClientConnector.cs
+++ b/osu.Game/Online/PersistentEndpointClientConnector.cs
@@ -99,6 +99,8 @@ private async Task connect()
                     // this will also create a new cancellation token source.
                     await disconnect(false).ConfigureAwait(false);
 
+                    await Task.Delay(5000).ConfigureAwait(false);
+
                     // this token will be valid for the scope of this connection.
                     // if cancelled, we can be sure that a disconnect or reconnect is handled elsewhere.
                     var cancellationToken = connectCancelSource.Token;
diff --git a/osu.Game/OsuGameBase.cs b/osu.Game/OsuGameBase.cs
index 703444a92f..fb467472d3 100644
--- a/osu.Game/OsuGameBase.cs
+++ b/osu.Game/OsuGameBase.cs
@@ -22,6 +22,7 @@
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Textures;
 using osu.Framework.Input;
+using osu.Framework.Input.Events;
 using osu.Framework.Input.Handlers;
 using osu.Framework.Input.Handlers.Joystick;
 using osu.Framework.Input.Handlers.Midi;
@@ -65,6 +66,7 @@
 using osu.Game.Scoring;
 using osu.Game.Skinning;
 using osu.Game.Utils;
+using osuTK.Input;
 using RuntimeInfo = osu.Framework.RuntimeInfo;
 
 namespace osu.Game
@@ -104,7 +106,7 @@ public partial class OsuGameBase : Framework.Game, ICanAcceptFiles, IBeatSyncPro
         /// </summary>
         private const double global_track_volume_adjust = 0.8;
 
-        public virtual bool UseDevelopmentServer => DebugUtils.IsDebugBuild;
+        public virtual bool UseDevelopmentServer => false;
 
         public virtual EndpointConfiguration CreateEndpoints() =>
             UseDevelopmentServer ? new DevelopmentEndpointConfiguration() : new ProductionEndpointConfiguration();
@@ -466,6 +468,20 @@ private void addFilesWarning()
             }
         }
 
+        protected override bool OnKeyDown(KeyDownEvent e)
+        {
+            if (e.Key == Key.F7)
+            {
+                Logger.Log("Forcing reconnect!", level: LogLevel.Important);
+
+                ((IStatefulUserHubClient)MultiplayerClient).ServerShuttingDown();
+                ((IStatefulUserHubClient)SpectatorClient).ServerShuttingDown();
+                ((IStatefulUserHubClient)metadataClient).ServerShuttingDown();
+            }
+
+            return base.OnKeyDown(e);
+        }
+
         private void onTrackChanged(WorkingBeatmap beatmap, TrackChangeDirection direction) => beatmapClock.ChangeSource(beatmap.Track);
 
         protected virtual void InitialiseFonts()