Normalize active session ids in frontend

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

@@ -209,13 +209,15 @@ function SessionFilesPanel({
 	useEffect(() => {
 		let cancelled = false;
 		async function loadFiles() {
-			const activeSessionId =
-				sessionId ?? window.localStorage.getItem("claw.activeSessionId");
+			const activeSessionId = normalizeSessionId(
+				sessionId ?? window.localStorage.getItem("claw.activeSessionId"),
+			);
 			if (!activeSessionId) {
 				setPayload({ input: [], output: [] });
 				setStatus("当前还没有可用会话。");
 				return;
 			}
+			window.localStorage.setItem("claw.activeSessionId", activeSessionId);
 			setStatus("正在读取聊天中的文件...");
 			try {
 				const url = new URL("/api/claw/files", window.location.origin);
@@ -280,6 +282,12 @@ function SessionFilesPanel({
 	);
 }
 
+function normalizeSessionId(value: unknown) {
+	if (typeof value !== "string") return null;
+	const trimmed = value.trim();
+	return trimmed || null;
+}
+
 function FileSection({
 	title,
 	files,