智能体对话选 Agent 直达、澄清问题批量提交、LLM 错误中文化等

- 前端：新会话选 Agent 后直接跳转并自动发送，智能体页输入框宽度与首页对齐
- 前端：澄清卡片支持多选+多问题合并提交，消除单题逐一发送的割裂感
- 前端：定时任务弹窗 Agent 下拉支持长描述截断，避免撑破布局
- 后端：ask_clarification 支持同回合多次调用以提多个独立问题
- 后端：LLM 错误处理与定时任务失败提示统一改为中文

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend-web/src/pages/AgentChatPage.tsx

@@ -3,7 +3,7 @@
 import { BotIcon, PlusSquare } from "lucide-react";
 import { useParams, useRouter } from "next/navigation";
 import { useRouteBase } from "@/core/route-base";
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 
 import type { PromptInputMessage } from "@/components/ai-elements/prompt-input";
 import { Button } from "@/components/ui/button";
@@ -36,13 +36,30 @@ export default function AgentChatPage() {
   const routeBase = useRouteBase();
   const { t } = useI18n();
   const [showFollowups, setShowFollowups] = useState(false);
-  const [hasStartedConversation, setHasStartedConversation] = useState(false);
   const router = useRouter();
 
   const { agent_id } = useParams<{
     agent_id: string;
   }>();
 
+  // If ChatPage stashed an opening message for this agent, skip the landing
+  // screen on first render so the user doesn't see a flash of the welcome UI
+  // before the auto-sent message takes over.
+  const hasPendingForThisAgent = () => {
+    if (typeof window === "undefined" || !agent_id) return false;
+    try {
+      const raw = sessionStorage.getItem("pendingAgentMessage");
+      if (!raw) return false;
+      const parsed = JSON.parse(raw);
+      return parsed?.agentId === agent_id && !!parsed?.text;
+    } catch {
+      return false;
+    }
+  };
+  const [hasStartedConversation, setHasStartedConversation] = useState(
+    hasPendingForThisAgent,
+  );
+
   const { agent } = useAgent(agent_id);
 
   const { threadId, setThreadId, isNewThread, setIsNewThread } =
@@ -52,9 +69,10 @@ export default function AgentChatPage() {
 
   useEffect(() => {
     if (isNewThread) {
-      setHasStartedConversation(false);
+      setHasStartedConversation(hasPendingForThisAgent());
     }
-  }, [isNewThread, threadId]);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [isNewThread, threadId, agent_id]);
 
   const { showNotification } = useNotification();
   const [thread, sendMessage] = useThreadStream({
@@ -100,6 +118,26 @@ export default function AgentChatPage() {
     [sendMessage, threadId, agent_id],
   );
 
+  // ChatPage stashes the opening message in sessionStorage when the user picks
+  // an agent on the landing screen, then redirects here. Replay it once so the
+  // user doesn't have to re-type the question on the agent chat page.
+  const pendingMessageHandled = useRef(false);
+  useEffect(() => {
+    if (pendingMessageHandled.current) return;
+    if (!agent_id || !isNewThread || hasStartedConversation) return;
+    let pending: { agentId?: string; text?: string } | null = null;
+    try {
+      const raw = sessionStorage.getItem("pendingAgentMessage");
+      if (raw) pending = JSON.parse(raw);
+    } catch {
+      pending = null;
+    }
+    if (!pending || pending.agentId !== agent_id || !pending.text) return;
+    pendingMessageHandled.current = true;
+    sessionStorage.removeItem("pendingAgentMessage");
+    handleSubmit({ text: pending.text, files: [] });
+  }, [agent_id, isNewThread, hasStartedConversation, handleSubmit]);
+
   const handleClarificationSubmit = useCallback(
     (answer: string) => {
       setHasStartedConversation(true);
@@ -180,8 +218,8 @@ export default function AgentChatPage() {
                   "relative w-full",
                   isLandingState && "-translate-y-[calc(50vh-96px)]",
                   isLandingState
-                    ? "max-w-(--container-width-sm)"
-                    : "max-w-(--container-width-md)",
+                    ? "max-w-(--container-width-md)"
+                    : "max-w-(--container-width-lg)",
                 )}
               >
                 <div className="absolute -top-4 right-0 left-0 z-0">

frontend-web/src/pages/ScheduledTasksPage.tsx

@@ -758,11 +758,11 @@ export default function ScheduledTasksPage() {
       </Dialog>
 
       <Dialog open={creating || !!editing} onOpenChange={(open) => !open && closeDialog()}>
-        <DialogContent className="max-w-2xl">
-          <DialogHeader>
+        <DialogContent className="max-w-2xl overflow-hidden">
+          <DialogHeader className="min-w-0">
             <DialogTitle>{creating ? "新建定时任务" : "编辑定时任务"}</DialogTitle>
           </DialogHeader>
-          <div className="flex flex-col gap-3">
+          <div className="flex min-w-0 flex-col gap-3">
             <Input
               value={form.name}
               onChange={(event) =>
@@ -798,15 +798,20 @@ export default function ScheduledTasksPage() {
                 }))
               }
             >
-              <SelectTrigger>
+              <SelectTrigger className="w-full min-w-0 max-w-full overflow-hidden [&>span]:min-w-0 [&>span]:flex-1 [&>span]:truncate">
                 <SelectValue placeholder="选择执行智能体" />
               </SelectTrigger>
-              <SelectContent>
+              <SelectContent
+                position="popper"
+                className="w-[var(--radix-select-trigger-width)] max-w-[var(--radix-select-trigger-width)]"
+              >
                 <SelectItem value="__default__">默认助手（不指定）</SelectItem>
                 {agents.map((agent) => (
                   <SelectItem key={agent.id} value={agent.id}>
-                    {agent.name}
-                    {agent.description ? ` — ${agent.description}` : ""}
+                    <span className="block truncate">
+                      {agent.name}
+                      {agent.description ? ` — ${agent.description}` : ""}
+                    </span>
                   </SelectItem>
                 ))}
               </SelectContent>