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/components/workspace/messages/message-list.tsx

@@ -18,6 +18,7 @@ import { useRehypeSplitWordsIntoSpans } from "@/core/rehype";
 import type { Subtask } from "@/core/tasks";
 import { useUpdateSubtask } from "@/core/tasks/context";
 import type { AgentThreadState } from "@/core/threads";
+import type { Message } from "@langchain/langgraph-sdk";
 import { cn } from "@/lib/utils";
 
 import { ArtifactFileList } from "../artifacts/artifact-file-list";
@@ -33,16 +34,20 @@ export function MessageList({
   className,
   threadId,
   thread,
+  messagesOverride,
   paddingBottom = 160,
 }: {
   className?: string;
   threadId: string;
   thread: UseStream<AgentThreadState>;
+  /** When set (e.g. from onFinish), use instead of thread.messages so SSE end shows complete state. */
+  messagesOverride?: Message[];
   paddingBottom?: number;
 }) {
   const { t } = useI18n();
   const rehypePlugins = useRehypeSplitWordsIntoSpans(thread.isLoading);
   const updateSubtask = useUpdateSubtask();
+  const messages = messagesOverride ?? thread.messages;
   if (thread.isThreadLoading) {
     return <MessageListSkeleton />;
   }
@@ -51,7 +56,7 @@ export function MessageList({
       className={cn("flex size-full flex-col justify-center", className)}
     >
       <ConversationContent className="mx-auto w-full max-w-(--container-width-md) gap-8 pt-12">
-        {groupMessages(thread.messages, (group) => {
+        {groupMessages(messages, (group) => {
           if (group.type === "human" || group.type === "assistant") {
             return (
               <MessageListItem