fix: detail panel not opening after task selection

Open detail window synchronously to avoid popup blocking, persist selected task, and show API errors on the detail page.

frontend/src/lib/dualMonitor.ts

@@ -5,6 +5,7 @@
 
 const CHANNEL_NAME = 'eee_dashboard';
 const DETAIL_WINDOW_NAME = 'eene_detail';
+const SELECTED_TASK_KEY = 'eee_selected_task';
 
 type DualMonitorEvent =
   | { type: 'TASK_SELECTED'; taskId: string }
@@ -83,6 +84,38 @@ export function isDetailWindowOpen(): boolean {
   return !!detailWindow && !detailWindow.closed;
 }
 
+function persistSelectedTask(taskId: string | null) {
+  if (taskId) sessionStorage.setItem(SELECTED_TASK_KEY, taskId);
+  else sessionStorage.removeItem(SELECTED_TASK_KEY);
+}
+
+/** 상세 페이지 초기 로드용 (BroadcastChannel 유실 대비) */
+export function getPersistedTaskId(): string | null {
+  return sessionStorage.getItem(SELECTED_TASK_KEY);
+}
+
+function parseWindowFeatures(features: string) {
+  const out: Record<string, number> = {};
+  for (const part of features.split(',')) {
+    const [key, value] = part.split('=');
+    if (key && value != null) out[key.trim()] = Number(value);
+  }
+  return out;
+}
+
+function applyWindowPlacement(win: Window, left: number, top: number, width: number, height: number) {
+  try {
+    win.moveTo(left, top);
+    win.resizeTo(width, height);
+  } catch {
+    // 브라우저 정책으로 실패할 수 있음
+  }
+}
+
+function postTaskSelected(taskId: string) {
+  getChannel().postMessage({ type: 'TASK_SELECTED', taskId } satisfies DualMonitorEvent);
+}
+
 /** 상세 창 토글 — 열려 있으면 닫고, 닫혀 있으면 오른쪽 모니터에 열기 */
 export async function openDetailWindow(): Promise<Window | null> {
   if (isDetailWindowOpen()) {
@@ -92,33 +125,55 @@ export async function openDetailWindow(): Promise<Window | null> {
   }
 
   const detailUrl = `${window.location.origin}/detail`;
-  const features = await getRightMonitorWindowFeatures();
+  // 사용자 클릭 직후 동기적으로 열어야 팝업 차단을 피할 수 있음
+  detailWindow = window.open(detailUrl, DETAIL_WINDOW_NAME, 'noopener,noreferrer,width=1280,height=900');
+  if (!detailWindow) {
+    alert('팝업이 차단되었습니다. 브라우저에서 이 사이트의 팝업을 허용해 주세요.');
+    return null;
+  }
 
-  detailWindow = window.open(detailUrl, DETAIL_WINDOW_NAME, features);
   try {
-    detailWindow?.focus();
+    detailWindow.focus();
   } catch {
     // popup-blocked 등
   }
+
+  void getRightMonitorWindowFeatures().then((features) => {
+    const { left, top, width, height } = parseWindowFeatures(features);
+    if (detailWindow && !detailWindow.closed && left != null && top != null && width && height) {
+      applyWindowPlacement(detailWindow, left, top, width, height);
+    }
+  });
+
+  const savedTaskId = getPersistedTaskId();
+  if (savedTaskId) {
+    postTaskSelected(savedTaskId);
+    setTimeout(() => postTaskSelected(savedTaskId), 500);
+  }
+
   return detailWindow;
 }
 
 /** 좌측 → 우측: 업무 선택 이벤트 전송 (창이 닫혀 있으면 열고 전송) */
 export async function sendTaskSelected(taskId: string): Promise<void> {
+  persistSelectedTask(taskId);
+
   if (!isDetailWindowOpen()) {
-    await openDetailWindow();
-    // 창이 로드될 때까지 잠시 대기 후 전송
-    setTimeout(() => {
-      getChannel().postMessage({ type: 'TASK_SELECTED', taskId } satisfies DualMonitorEvent);
-    }, 800);
+    const win = await openDetailWindow();
+    if (!win) return;
+    postTaskSelected(taskId);
+    setTimeout(() => postTaskSelected(taskId), 500);
+    setTimeout(() => postTaskSelected(taskId), 1500);
     return;
   }
+
   detailWindow!.focus();
-  getChannel().postMessage({ type: 'TASK_SELECTED', taskId } satisfies DualMonitorEvent);
+  postTaskSelected(taskId);
 }
 
 /** 좌측 → 우측: 업무 선택 해제 */
 export function sendTaskDeselected(): void {
+  persistSelectedTask(null);
   getChannel().postMessage({ type: 'TASK_DESELECTED' } satisfies DualMonitorEvent);
 }
 

frontend/src/pages/DetailPage.tsx

@@ -1,7 +1,8 @@
 import { useState, useEffect, useMemo } from 'react';
+import { useParams } from 'react-router-dom';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { apiClient, getApiErrorMessage } from '../lib/apiClient';
-import { onDualMonitorEvent } from '../lib/dualMonitor';
+import { onDualMonitorEvent, getPersistedTaskId } from '../lib/dualMonitor';
 import { ContextMenu } from '../components/common/ContextMenu';
 import { FeedbackModal, type FeedbackFormData } from '../components/detail/FeedbackModal';
 import { ResultPreview } from '../components/detail/ResultPreview';
@@ -701,7 +702,14 @@ function DetailView({ task }: { task: TaskWithRelations }) {
 }
 
 export default function DetailPage() {
-  const [taskId, setTaskId] = useState<string | null>(null);
+  const { taskId: routeTaskId } = useParams<{ taskId?: string }>();
+  const [taskId, setTaskId] = useState<string | null>(
+    () => routeTaskId ?? getPersistedTaskId(),
+  );
+
+  useEffect(() => {
+    if (routeTaskId) setTaskId(routeTaskId);
+  }, [routeTaskId]);
 
   useEffect(() => {
     const unsub = onDualMonitorEvent((evt) => {
@@ -711,7 +719,7 @@ export default function DetailPage() {
     return unsub;
   }, []);
 
-  const { data: task, isLoading } = useQuery({
+  const { data: task, isLoading, isError, error } = useQuery({
     queryKey: ['task', taskId],
     queryFn: async () => {
       const { data } = await apiClient.get<TaskWithRelations>(`/tasks/${taskId}`);
@@ -719,6 +727,7 @@ export default function DetailPage() {
     },
     enabled: !!taskId,
     staleTime: 10_000,
+    retry: 2,
   });
 
   return (
@@ -728,6 +737,11 @@ export default function DetailPage() {
       <div className="flex min-h-0 flex-1 flex-col overflow-hidden">
         {isLoading ? (
           <div className="flex h-full items-center justify-center text-xl text-slate-400">불러오는 중...</div>
+        ) : isError ? (
+          <div className="flex h-full flex-col items-center justify-center gap-3 text-center">
+            <p className="text-xl font-bold text-red-500">상세 정보를 불러오지 못했습니다.</p>
+            <p className="text-base text-slate-500">{getApiErrorMessage(error, '서버 연결을 확인해 주세요.')}</p>
+          </div>
         ) : !task ? (
           <WaitingScreen />
         ) : (