Add presenter role for game flow control

App.tsx

@@ -91,7 +91,10 @@ function App() {
     attemptReconnect,
     goHomeFromDisconnected,
     endGame,
-    resumeGame
+    resumeGame,
+    presenterId,
+    setPresenterPlayer,
+    sendAdvance
   } = useGame();
 
   const handleSaveQuiz = async () => {
@@ -199,6 +202,8 @@ function App() {
               onEndGame={role === 'HOST' ? endGame : undefined}
               currentPlayerId={currentPlayerId}
               hostParticipates={gameConfig.hostParticipates}
+              presenterId={presenterId}
+              onSetPresenter={setPresenterPlayer}
             />
             {auth.isAuthenticated && pendingQuizToSave && (
               <SaveQuizPrompt
@@ -259,6 +264,8 @@ function App() {
                 selectedOption={selectedOption}
                 role={role}
                 onNext={showScoreboard}
+                isPresenter={currentPlayerId === presenterId}
+                onPresenterAdvance={() => sendAdvance('SCOREBOARD')}
             />
           ) : currentPlayerName ? (
             <WaitingToRejoin
@@ -274,6 +281,8 @@ function App() {
             onNext={nextQuestion}
             isHost={role === 'HOST'}
             currentPlayerId={currentPlayerId}
+            isPresenter={currentPlayerId === presenterId}
+            onPresenterAdvance={() => sendAdvance('NEXT')}
           />
         ) : null}