修复「新对话」流式中无法重置 + 参考文献开关默认关闭并加对勾

- 流式回答过程中点「新对话」:URL 同路径导致 react-router navigate 静默 no-op,
  下游 hook 收不到事件;改为显式 navigate(..., {replace:true, state:{resetAt}})
  保证每次点击刷新 location.key,并让 useThreadChat 监听 location.key 触发重置
- useThreadStream 在 threadId 变化时 stop() 掉上一条 SSE,避免旧流继续派发事件
- 引入 KeyedChatPage 用 location.key 作 ChatRuntime key,真正的导航触发整树 remount,
  解决 useStream 内部 stream.values 残留导致欢迎页底下还能看到旧消息的过渡帧问题
- 「参考文献」开关默认关闭(local.ts),开启态在文字前额外多一个 ✓ 对勾

frontend-web/src/core/threads/hooks.ts

@@ -12,8 +12,8 @@ import { apiFetch } from "../api";
 import { getBackendBaseURL } from "../config";
 import { useI18n } from "../i18n/hooks";
 import type { FileInMessage } from "../messages/utils";
-import type { LocalSettings } from "../settings";
-import { useLocalSettings } from "../settings";
+import type { LocalSettings } from "../settings";
+import { useLocalSettings } from "../settings";
 import { useUpdateSubtask } from "../tasks/context";
 import type { UploadedFileInfo } from "../uploads";
 import { promptInputFilePartToFile, uploadFiles } from "../uploads";
@@ -146,8 +146,8 @@ export function useThreadStream({
   onFinish,
   onToolEnd,
 }: ThreadStreamOptions) {
-  const { t } = useI18n();
-  const [localSettings] = useLocalSettings();
+  const { t } = useI18n();
+  const [localSettings] = useLocalSettings();
   // Track the thread ID that is currently streaming to handle thread changes during streaming
   const [onStreamThreadId, setOnStreamThreadId] = useState(() => threadId);
   // Ref to track current thread ID across async callbacks without causing re-renders,
@@ -309,9 +309,27 @@ export function useThreadStream({
   // Track message count before sending so we know when server has responded
   const prevMsgCountRef = useRef(thread.messages.length);
 
+  // Keep a ref to the latest `thread` so the threadId-change effect can stop
+  // an in-flight stream without re-running on every render that produces a
+  // new `thread` identity.
+  const threadStreamRef = useRef(thread);
+  threadStreamRef.current = thread;
+
   // Reset thread-local pending UI state when switching between threads so
   // optimistic messages and in-flight guards do not leak across chat views.
+  // Also abort any in-flight SSE from the previous thread: without this,
+  // clicking "新对话" mid-stream leaves the old run firing onUpdate events
+  // against the now-detached thread context, which manifests as the page
+  // appearing unresponsive to the navigation.
   useEffect(() => {
+    const prevThread = threadStreamRef.current;
+    if (prevThread?.isLoading) {
+      try {
+        prevThread.stop();
+      } catch {
+        // best-effort; nothing useful to do if the SDK fails to abort
+      }
+    }
     startedRef.current = false;
     sendInFlightRef.current = false;
     prevMsgCountRef.current = 0;
@@ -508,9 +526,9 @@ export function useThreadStream({
                     : context.mode === "thinking"
                       ? "low"
                       : undefined),
-              memory_injection_enabled: context.memory_injection_enabled ?? true,
-              rag_mode_enabled: localSettings.display.ragModeEnabled,
-              thread_id: threadId,
+              memory_injection_enabled: context.memory_injection_enabled ?? true,
+              rag_mode_enabled: localSettings.display.ragModeEnabled,
+              thread_id: threadId,
             },
           },
         );
@@ -523,8 +541,8 @@ export function useThreadStream({
         sendInFlightRef.current = false;
       }
     },
-    [thread, _handleOnStart, t.uploads.uploadingFiles, context, localSettings.display.ragModeEnabled, queryClient],
-  );
+    [thread, _handleOnStart, t.uploads.uploadingFiles, context, localSettings.display.ragModeEnabled, queryClient],
+  );
 
   // Merge thread with optimistic messages for display
   const mergedThread =