Fix activity replay after refresh

frontend/app/components/assistant-ui/activity-panel.tsx

@@ -45,6 +45,7 @@ type ActivityContextValue = {
 	selectedId: string | null;
 	sessionId: string | null;
 	filesRefreshToken: number;
+	openActivity: () => void;
 	openItem: (id: string) => void;
 	openFiles: (sessionId?: string | null) => void;
 	close: () => void;
@@ -58,6 +59,11 @@ export function ActivityProvider({ children }: { children: ReactNode }) {
 	const [selectedId, setSelectedId] = useState<string | null>(null);
 	const [sessionId, setSessionId] = useState<string | null>(null);
 	const [filesRefreshToken, setFilesRefreshToken] = useState(0);
+	const openActivity = useCallback(() => {
+		setMode("activity");
+		setSelectedId(null);
+		setOpen(true);
+	}, []);
 	const openItem = useCallback((id: string) => {
 		setMode("activity");
 		setSelectedId(id);
@@ -82,6 +88,7 @@ export function ActivityProvider({ children }: { children: ReactNode }) {
 			selectedId,
 			sessionId,
 			filesRefreshToken,
+			openActivity,
 			openItem,
 			openFiles,
 			close,
@@ -92,6 +99,7 @@ export function ActivityProvider({ children }: { children: ReactNode }) {
 			selectedId,
 			sessionId,
 			filesRefreshToken,
+			openActivity,
 			openItem,
 			openFiles,
 			close,
@@ -133,6 +141,7 @@ export function ActivityPanel() {
 		selectedId,
 		sessionId,
 		filesRefreshToken,
+		openActivity,
 		openItem,
 		close,
 	} = useActivityPanel();
@@ -151,10 +160,10 @@ export function ActivityPanel() {
 			latestId &&
 			latestId !== prevLatestIdRef.current
 		) {
-			openItem(latestId);
+			openActivity();
 		}
 		prevLatestIdRef.current = latestId;
-	}, [items, mode, openItem]);
+	}, [items, mode, openActivity]);
 
 	if (!open) return null;
 

frontend/app/components/assistant-ui/thread-list.tsx

@@ -406,13 +406,13 @@ export function toReplayRepository(
 		if (message.role === "tool") continue;
 		if (message.role !== "user" && message.role !== "assistant") continue;
 		const content = cleanStoredContent(message.content ?? "");
-		if (!content) continue;
-		if (content.trimStart().startsWith("<system-reminder>")) continue;
-		const id = `${fallbackSessionId}-${index}`;
 		const toolParts =
 			message.role === "assistant"
 				? toToolParts(message.tool_calls ?? [], toolResults, content)
 				: [];
+		if (!content && !toolParts.length) continue;
+		if (content.trimStart().startsWith("<system-reminder>")) continue;
+		const id = `${fallbackSessionId}-${index}`;
 		const shouldShowAssistantText =
 			message.role !== "assistant" ||
 			!toolParts.length ||