fix session routing and subagent visibility

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

@@ -92,8 +92,9 @@ import {
 	writePendingWorkspaceSessionId,
 } from "@/lib/claw-active-session";
 import { useClawSessionReplay } from "@/lib/claw-session-replay";
-import { cn } from "@/lib/utils";
+import { readSessionIdFromUrl } from "@/lib/claw-session-url";
 import { dispatchSkillToggled } from "@/lib/use-training-mode";
+import { cn } from "@/lib/utils";
 
 type ComposerInsertEvent = CustomEvent<{ text: string }>;
 
@@ -396,21 +397,25 @@ function usePendingWorkspaceSessionId() {
 function useActiveSessionId() {
 	const [sessionId, setSessionId] = useState<string | null>(() =>
 		typeof window !== "undefined"
-			? normalizeSessionId(readActiveSessionId())
+			? normalizeSessionId(readSessionIdFromUrl() ?? readActiveSessionId())
 			: null,
 	);
 
 	useEffect(() => {
 		const refresh = () => {
-			setSessionId(normalizeSessionId(readActiveSessionId()));
+			setSessionId(
+				normalizeSessionId(readSessionIdFromUrl() ?? readActiveSessionId()),
+			);
 		};
 		window.addEventListener(ACTIVE_SESSION_CHANGED_EVENT, refresh);
 		window.addEventListener("storage", refresh);
 		window.addEventListener("focus", refresh);
+		window.addEventListener("popstate", refresh);
 		return () => {
 			window.removeEventListener(ACTIVE_SESSION_CHANGED_EVENT, refresh);
 			window.removeEventListener("storage", refresh);
 			window.removeEventListener("focus", refresh);
+			window.removeEventListener("popstate", refresh);
 		};
 	}, []);
 
@@ -1349,7 +1354,9 @@ function useComposerContextStatus() {
 				const statePayload = stateResponse.ok
 					? ((await stateResponse.json()) as ClawState)
 					: {};
-				const activeSessionId = normalizeSessionId(readActiveSessionId());
+				const activeSessionId = normalizeSessionId(
+					readSessionIdFromUrl() ?? readActiveSessionId(),
+				);
 				const latestMessageSessionId = normalizeSessionId(latestSessionId);
 				let sessionId = normalizeSessionId(
 					isRunning
@@ -2088,7 +2095,10 @@ const ActivityChainSummary: FC<{
 			liveStartedAtRef.current = authoritativeStartedAt;
 		} else if (liveStartedAtRef.current === null && storedElapsedMs !== null) {
 			liveStartedAtRef.current = Date.now() - storedElapsedMs;
-		} else if (liveStartedAtRef.current === null && messageCreatedAtMs !== null) {
+		} else if (
+			liveStartedAtRef.current === null &&
+			messageCreatedAtMs !== null
+		) {
 			liveStartedAtRef.current = messageCreatedAtMs;
 		}
 		const startedAt = liveStartedAtRef.current;