Implement HTML-based lobby system with player list management, host controls, and real-time updates. Add JavaScript-WASM communication for lobby state changes and game start triggers.

cmd/client/main.go

@@ -355,6 +355,16 @@ func (g *Game) updateLobby() {
 		g.gameState = game.GameState{Players: make(map[string]game.PlayerState)}
 	}
 
+	// Lobby State Change Detection (für HTML-Updates)
+	g.stateMutex.Lock()
+	currentPlayerCount := len(g.gameState.Players)
+	g.stateMutex.Unlock()
+
+	if currentPlayerCount != g.lastPlayerCount {
+		g.lastPlayerCount = currentPlayerCount
+		g.sendLobbyUpdateToJS()
+	}
+
 	// Spiel wurde gestartet?
 	if g.gameState.Status == "COUNTDOWN" || g.gameState.Status == "RUNNING" {
 		g.appState = StateGame