fix(chess): exclude own games from spectator list

Skip adding games to spectatingGames when the user is a participant
(playerPubkey or opponentPubkey matches userPubkey) or when the game
is already finished.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/chess/ChessLobbyState.kt

@@ -22,6 +22,7 @@ package com.vitorpamplona.amethyst.commons.chess
 
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.quartz.nip64Chess.Color
+import com.vitorpamplona.quartz.nip64Chess.GameStatus
 import com.vitorpamplona.quartz.nip64Chess.LiveChessGameState
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -497,6 +498,14 @@ class ChessLobbyState(
             _activeGames.update { it + (gameId to state) }
             return
         }
+        // Don't add own games to spectating list
+        if (state.playerPubkey == userPubkey || state.opponentPubkey == userPubkey) {
+            return
+        }
+        // Don't add finished games to spectating list
+        if (state.gameStatus.value is GameStatus.Finished) {
+            return
+        }
         _spectatingGames.update { it + (gameId to state) }
     }