feat: 精简showWelcomeStyle和isNewThread断言。实现在/[thread_id]?xclaw_used=true时，显示欢迎页

frontend/src/components/workspace/chats/use-thread-chat.ts

@@ -3,7 +3,6 @@
 import { useParams, usePathname, useSearchParams } from "next/navigation";
 import { useCallback, useEffect, useState } from "react";
 
-import { resolveThreadQueryIntent } from "@/core/threads/utils";
 
 export function useThreadChat() {
   const pathname = usePathname();
@@ -68,21 +67,19 @@ export function useThreadChat() {
     },
     [queryThreadIdFromParams],
   );
-  const intent = resolveThreadQueryIntent({
-    pathThreadId: threadIdFromPathOrParams,
-    queryThreadId: queryThreadIdFromParams,
-    isNewRoute,
-  });
-  const { isNewThread: isNewRequested, showWelcomeStyle } = intent;
 
+  // New session is only controlled by `/workspace/chats/new`.
+  const [isNewThread, setIsNewThread] = useState(() => isNewRoute);
+
+  const [showWelcomeStyle, setShowWelcomeStyle] = useState(() => {
+    return isNewRoute|| searchParams.get("xclaw_used") === "true";
+  });
   // console.log("[useThreadChat] effectiveThreadIdFromPath", effectiveThreadIdFromPath);
 
   const [threadId, setThreadId] = useState<string>(() => {
     return threadIdFromPathOrParams;
   });
 
-  // New session is only controlled by `/workspace/chats/new`.
-  const [isNewThread, setIsNewThread] = useState(() => isNewRequested);
 
   useEffect(() => {
     // 记住最近一次有效的 thread_id，供下次加载兜底使用。
@@ -92,6 +89,7 @@ export function useThreadChat() {
     setIsNewThread(isNewRoute);
     // Prefer path thread id, fall back to query thread_id when path is /new.
     setThreadId(threadIdFromPathOrParams);
+    setShowWelcomeStyle(isNewRoute || searchParams.get("xclaw_used") === "true");
   }, [
     isNewRoute,
     normalizeThreadId,

frontend/src/core/threads/utils.ts

@@ -29,23 +29,6 @@ function normalizeThreadId(value?: string | null): string | undefined {
   return trimmed;
 }
 
-export function resolveThreadQueryIntent({
-  pathThreadId,
-  queryThreadId,
-  isNewRoute = false,
-}: ThreadQueryIntentInput): ThreadQueryIntent {
-  const normalizedPathId = normalizeThreadId(pathThreadId);
-  const normalizedQueryId = normalizeThreadId(queryThreadId);
-  const isNewThread = isNewRoute;
-
-  return {
-    // 优先使用路径 thread_id；/new 场景回落到 query thread_id
-    threadId: normalizedPathId ?? normalizedQueryId,
-    // 新逻辑只由路由 /workspace/chats/new 控制“新会话”
-    isNewThread,
-    showWelcomeStyle: isNewThread,
-  };
-}
 
 export function textOfMessage(message: Message) {
   if (typeof message.content === "string") {