fix(frontend): no half-finished citations, correct state when SSE ends

Citations:
- In shouldShowCitationLoading, treat any unreplaced [cite-N] in cleanContent
  as show-loading (no body). Fixes Ultra and other modes when refs arrive
  before the <citations> block in the stream.
- Single rule: hasUnreplacedCitationRefs(cleanContent) => true forces loading;
  then isLoading && hasCitationsBlock(rawContent) for streaming indicator.

SSE end state:
- When stream finishes, SDK may set isLoading=false before client state has
  the final message content, so UI stayed wrong until refresh.
- Store onFinish(state) as finalState in chat page; clear when stream starts.
- Pass messagesOverride={finalState.messages} to MessageList when not loading
  so the list uses server-complete messages right after SSE ends (no refresh).

Chore:
- Stop tracking .githooks/pre-commit; add .githooks/ to .gitignore (local only).

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

---
fix(前端): 杜绝半成品引用，SSE 结束时展示正确状态

引用：
- shouldShowCitationLoading 中只要 cleanContent 仍含未替换的 [cite-N] 就
  只显示加载、不渲染正文，解决流式时引用块未到就出现 [cite-1] 的问题。
- 规则：hasUnreplacedCitationRefs(cleanContent) 为真则一律显示加载；
  此外 isLoading && hasCitationsBlock 用于流式时显示「正在整理引用」。

SSE 结束状态：
- 流结束时 SDK 可能先置 isLoading=false，客户端 messages 尚未包含
  最终内容，导致需刷新才显示正确。
- 在对话页保存 onFinish(state) 为 finalState，流开始时清空。
- 非加载时向 MessageList 传入 messagesOverride={finalState.messages}，
  列表在 SSE 结束后立即用服务端完整消息渲染，无需刷新。

杂项：
- 取消跟踪 .githooks/pre-commit，.gitignore 增加 .githooks/（仅本地）。

frontend/src/app/workspace/chats/[thread_id]/page.tsx

@@ -28,8 +28,9 @@ import { Welcome } from "@/components/workspace/welcome";
 import { useI18n } from "@/core/i18n/hooks";
 import { useNotification } from "@/core/notification/hooks";
 import { useLocalSettings } from "@/core/settings";
-import { type AgentThread } from "@/core/threads";
+import { type AgentThread, type AgentThreadState } from "@/core/threads";
 import { useSubmitThread, useThreadStream } from "@/core/threads/hooks";
+import type { Message } from "@langchain/langgraph-sdk";
 import {
   pathOfThread,
   textOfMessage,
@@ -88,10 +89,12 @@ export default function ChatPage() {
   }, [threadIdFromPath]);
 
   const { showNotification } = useNotification();
+  const [finalState, setFinalState] = useState<AgentThreadState | null>(null);
   const thread = useThreadStream({
     isNewThread,
     threadId,
     onFinish: (state) => {
+      setFinalState(state);
       if (document.hidden || !document.hasFocus()) {
         let body = "Conversation finished";
         const lastMessage = state.messages[state.messages.length - 1];
@@ -111,6 +114,9 @@ export default function ChatPage() {
       }
     },
   });
+  useEffect(() => {
+    if (thread.isLoading) setFinalState(null);
+  }, [thread.isLoading]);
 
   const title = useMemo(() => {
     let result = isNewThread
@@ -239,6 +245,11 @@ export default function ChatPage() {
                   className={cn("size-full", !isNewThread && "pt-10")}
                   threadId={threadId}
                   thread={thread}
+                  messagesOverride={
+                    !thread.isLoading && finalState?.messages
+                      ? (finalState.messages as Message[])
+                      : undefined
+                  }
                   paddingBottom={todoListCollapsed ? 160 : 280}
                 />
               </div>