fix(frontend): smooth realtime dashboard refreshes

app/game-frontend/src/utils/latestRefreshQueue.ts

@@ -0,0 +1,38 @@
+export type LatestRefreshQueue = {
+    request: () => Promise<void>;
+    isRunning: () => boolean;
+};
+
+/**
+ * Coalesces bursts while guaranteeing one final refresh after an in-flight run.
+ * This matches realtime state semantics: intermediate turn notifications can be
+ * skipped, but the newest committed server state must never be lost.
+ */
+export const createLatestRefreshQueue = (refresh: () => Promise<void>): LatestRefreshQueue => {
+    let active: Promise<void> | null = null;
+    let refreshAgain = false;
+
+    const request = (): Promise<void> => {
+        if (active) {
+            refreshAgain = true;
+            return active;
+        }
+
+        const run = async () => {
+            do {
+                refreshAgain = false;
+                await refresh();
+            } while (refreshAgain);
+        };
+
+        active = run().finally(() => {
+            active = null;
+        });
+        return active;
+    };
+
+    return {
+        request,
+        isRunning: () => active !== null,
+    };
+};