fix(web): keep thinking off the spoken consult and rectification answer

Enumerate evidence kinds so education cannot be proposed as a kind, and stream Chinese thinking on a separate channel that collapses when the reply arrives.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/chat-message-row.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect, useLayoutEffect, useRef } from "react";
+import { useEffect, useLayoutEffect, useRef, useState } from "react";
 
 import { AgentActivityStatus } from "@/components/agent-activity-status";
 import { prefetchOnIdle } from "@/components/chat-chunk-prefetch";
@@ -31,6 +31,30 @@ function motionPreferred() {
 
 if (motionPreferred()) prefetchOnIdle(loadGsap);
 
+function MessageThinkingTrace({
+  text,
+  hasAnswer,
+}: Readonly<{
+  text: string;
+  hasAnswer: boolean;
+}>) {
+  const [userOpen, setUserOpen] = useState<boolean | null>(null);
+  const open = userOpen ?? !hasAnswer;
+  if (!text.trim()) return null;
+  return (
+    <details
+      className="message-thinking"
+      open={open}
+      onToggle={(event) => {
+        setUserOpen((event.currentTarget as HTMLDetailsElement).open);
+      }}
+    >
+      <summary>思考过程</summary>
+      <div className="message-thinking-body">{text}</div>
+    </details>
+  );
+}
+
 export function AgentAvatar() {
   return <span className="agent-avatar" aria-hidden="true" />;
 }
@@ -104,6 +128,12 @@ export function ChatMessageRow({
                   completedTrail={message.activity?.completedTrail}
                 />
               )}
+              {message.thinkingText && (
+                <MessageThinkingTrace
+                  text={message.thinkingText}
+                  hasAnswer={Boolean(message.text.trim())}
+                />
+              )}
               {message.text && (
                 <ChatMessageContent
                   text={message.text}