Final Android revert and logic stability with bot fix resolutions

- Reverted Android project properties and Oboe bridge to cccb5b8.
- Ported Multiplayer and Daily Challenge stability fixes from 4469927/57f8446d.
- Resolved InspectCode / CodeQL warnings:
    - Merged sequential null checks into pattern matching in `TestSceneDailyChallengeIntro.cs`.
    - Converted complex delegates to lambda expressions in visual tests.
    - Fixed missing blank lines in `GameplayWarmupScreen.cs`.
    - Removed redundant member initializers in `SpectatorList.cs`.
    - Replaced tabs with spaces and removed trailing whitespace across modified files.
- Updated CI to Xcode 26.3 and fixed test timeouts in `TestScenePlaylistsRoomCreation.cs`.

Author: google-labs-jules[bot]

osu.Game.Tests/Visual/DailyChallenge/TestSceneDailyChallengeIntro.cs

@@ -99,12 +99,12 @@ private void startChallenge(string suffix)
                 room = newRoom;
                 API.Perform(new CreateRoomRequest(newRoom));
             });
-            AddUntilStep($"wait for room id ({suffix})", () => room?.RoomID != null && room.RoomID > 0);
+            AddUntilStep($"wait for room id ({suffix})", () => room?.RoomID > 0 == true);
             AddUntilStep($"wait for playlist id ({suffix})", () => room?.Playlist.All(p => p.ID > 0) == true);
             AddStep($"signal client ({suffix})", () =>
             {
-                if (room != null && room.RoomID.HasValue)
-                    metadataClient.DailyChallengeUpdated(new DailyChallengeInfo { RoomID = room.RoomID.Value });
+                if (room?.RoomID is long roomId)
+                    metadataClient.DailyChallengeUpdated(new DailyChallengeInfo { RoomID = roomId });
             });
         }
     }