Prevent winner selection from being overwritten by polling updates using dirty flag

Added `winnerSelectionDirtyRef` to track when user has manually changed winner selection. Modified `loadGameMeta` to skip updating `winnerUserId` state when dirty flag is set, preventing polling from overwriting user's unsaved selection. Introduced `selectWinner` helper that sets dirty flag on manual selection and clears flag after successful save. Reset dirty flag in all state cleanup handlers (goHome, logout, le

frontend/src/App.jsx

@@ -60,6 +60,7 @@ export default function App() {
 
   // Winner selection (host only)
   const [winnerUserId, setWinnerUserId] = useState("");
+  const winnerSelectionDirtyRef = useRef(false);
 
   // Modals
   const [helpOpen, setHelpOpen] = useState(false);
@@ -149,7 +150,9 @@ export default function App() {
 
     const meta = await api(`/games/${gameId}`);
     setGameMeta(meta);
-    setWinnerUserId(meta?.winner_user_id || "");
+    if (!winnerSelectionDirtyRef.current) {
+      setWinnerUserId(meta?.winner_user_id || "");
+    }
 
     const chips = meta?.started ? await api(`/games/${gameId}/chips`) : [];
     setGameChips(chips || []);
@@ -226,6 +229,7 @@ export default function App() {
     lastWinnerIdRef.current = null;
     gameStartBaselineRef.current = false;
     lastGameStartedRef.current = false;
+    winnerSelectionDirtyRef.current = false;
     setCelebrateOpen(false);
     setCelebrateName("");
     setStartCelebrateOpen(false);
@@ -370,6 +374,7 @@ export default function App() {
     setMembers([]);
     setGameChips([]);
     setWinnerUserId("");
+    winnerSelectionDirtyRef.current = false;
 
     // reset winner celebration on logout
     winnerBaselineRef.current = false;
@@ -478,6 +483,7 @@ export default function App() {
     setMembers([]);
     setGameChips([]);
     setWinnerUserId("");
+    winnerSelectionDirtyRef.current = false;
     setPulseId(null);
 
     // auch Chip-Modal-State resetten
@@ -535,6 +541,7 @@ export default function App() {
     setMembers([]);
     setGameChips([]);
     setWinnerUserId("");
+    winnerSelectionDirtyRef.current = false;
     setChipOpen(false);
     setChipEntry(null);
     showSnack(language === "en" ? "Game cancelled." : "Spiel abgebrochen.");
@@ -547,6 +554,7 @@ export default function App() {
     setMembers([]);
     setGameChips([]);
     setWinnerUserId("");
+    winnerSelectionDirtyRef.current = false;
     setChipOpen(false);
     setChipEntry(null);
     setCelebrateOpen(false);
@@ -561,9 +569,15 @@ export default function App() {
       method: "PATCH",
       body: JSON.stringify({ winner_user_id: winnerUserId || null }),
     });
+    winnerSelectionDirtyRef.current = false;
     await loadGameMeta();
   };
 
+  const selectWinner = (value) => {
+    winnerSelectionDirtyRef.current = true;
+    setWinnerUserId(value);
+  };
+
   // ===== Sheet actions =====
   const cycleStatus = async (entry) => {
     if (gameMeta?.winner_user_id) return;
@@ -806,7 +820,7 @@ export default function App() {
             isHost={isHost}
             members={members}
             winnerUserId={winnerUserId}
-            setWinnerUserId={setWinnerUserId}
+            setWinnerUserId={selectWinner}
             onSave={saveWinner}
           />
         )}