fix: deduplicate workbench requests and remove unused map paths

src/features/agent/hooks/use-agent-message-inbox.ts

@@ -4,7 +4,7 @@ import type { AgentApiClient } from "../api/client";
 
 export function useAgentMessageInbox(client: AgentApiClient, sessionId: string | null) {
   const inbox = useSWR(sessionId ? ["agent-message-inbox", sessionId] : null,
-    ([, id]) => client.listAgentMessages(id), { revalidateOnFocus: true, shouldRetryOnError: false });
+    ([, id]) => client.listAgentMessages(id), { revalidateOnMount: false, revalidateOnFocus: true, shouldRetryOnError: false });
   const [loadingMore, setLoadingMore] = useState(false);
   const mutate = inbox.mutate;
   const refresh = useCallback(() => { void mutate().catch(() => undefined); }, [mutate]);
@@ -15,20 +15,27 @@ export function useAgentMessageInbox(client: AgentApiClient, sessionId: string |
     const controller = new AbortController();
     let timer: ReturnType<typeof setTimeout> | undefined;
     let retryDelay = 1500;
+    let initialized = false;
+    // Prefer the initial stream notification, but do not wait indefinitely for its first frame.
+    const initialLoadTimer = setTimeout(() => { initialized = true; refreshRef.current(); }, 1500);
     function subscribe() {
-      void client.streamAgentMessages(sessionId!, { signal: controller.signal, onMessage: () => { retryDelay = 1500; refreshRef.current(); } })
-        .catch(() => { retryDelay = Math.min(retryDelay * 2, 30_000); })
+      void client.streamAgentMessages(sessionId!, { signal: controller.signal, onMessage: () => { initialized = true; clearTimeout(initialLoadTimer); retryDelay = 1500; refreshRef.current(); } })
+        .catch(() => {
+          // A failed subscription must not prevent the initial list from loading.
+          if (!initialized && !controller.signal.aborted) { initialized = true; clearTimeout(initialLoadTimer); refreshRef.current(); }
+          retryDelay = Math.min(retryDelay * 2, 30_000);
+        })
         .finally(() => {
           if (!controller.signal.aborted) timer = setTimeout(subscribe, retryDelay);
         });
     }
     subscribe();
-    return () => { controller.abort(); clearTimeout(timer); };
+    return () => { controller.abort(); clearTimeout(timer); clearTimeout(initialLoadTimer); };
   }, [client, sessionId]);
   return {
     messages: inbox.data?.items ?? [],
     hasMore: Boolean(inbox.data?.next_cursor),
-    loading: inbox.isLoading,
+    loading: Boolean(sessionId) && (inbox.isLoading || (!inbox.data && !inbox.error)),
     error: inbox.error ? "任务消息暂时无法加载" : null,
     refresh,
     loadingMore,