feat: replace header emoji buttons with reference Lucide-style icons

Add users, plus, and dual-monitor SVG icons with matching 32px circular button styles from Design Planning Hub.

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

frontend/src/components/dashboard/DashboardHeader.tsx

@@ -1,3 +1,7 @@
+import { useState } from 'react';
+import { isDetailWindowOpen } from '../../lib/dualMonitor';
+import { DualMonitorIcon, PlusIcon, UsersIcon } from './HeaderIcons';
+
 interface Stats {
   total: number;
   inProgress: number;
@@ -15,9 +19,6 @@ interface DashboardHeaderProps {
   onOpenTaskManager: () => void;
 }
 
-const ICON_BTN =
-  'team-status-btn-new grid h-8 w-8 shrink-0 place-items-center rounded-full border-[1.5px] border-[#1a4d42] bg-[linear-gradient(180deg,#0d3f34_0%,#051f19_100%)] text-[#cef1eb] shadow-[0_0_0_1px_#000,0_2px_2px_rgba(0,0,0,0.60)] transition hover:brightness-125';
-
 const STAT_ACCENT = {
   전체: 'text-[#ffdb3a]',
   IN_PROGRESS: 'text-[#10b981]',
@@ -34,8 +35,15 @@ export function DashboardHeader({
   onOpenDetailWindow,
   onOpenTaskManager,
 }: DashboardHeaderProps) {
+  const [detailViewActive, setDetailViewActive] = useState(isDetailWindowOpen);
   const quarterLabel = quarter.replace(/^(\d{4})-Q(\d)$/, '$1 $2분기 업무');
 
+  const handleOpenDetailWindow = () => {
+    void Promise.resolve(onOpenDetailWindow()).then(() => {
+      setDetailViewActive(isDetailWindowOpen());
+    });
+  };
+
   const statItems = [
     { label: '전체', value: stats.total, statusKey: '전체' as const },
     { label: '진행', value: stats.inProgress, statusKey: 'IN_PROGRESS' as const },
@@ -52,8 +60,8 @@ export function DashboardHeader({
           <span>|</span>
           <span>People Growth Hub</span>
         </span>
-        <button type="button" title="팀 현황" className={`${ICON_BTN} text-[15px]`}>
-          👥
+        <button type="button" title="팀 현황" className="team-status-btn-new">
+          <UsersIcon size={16} />
         </button>
       </div>
 
@@ -78,21 +86,16 @@ export function DashboardHeader({
       </div>
 
       <div className="side-right-actions shrink-0">
-        <button
-          type="button"
-          onClick={onOpenTaskManager}
-          title="업무관리"
-          className={`header-action-btn-new ${ICON_BTN} text-[18px] font-bold leading-none`}
-        >
-          +
+        <button type="button" onClick={onOpenTaskManager} title="신규 프로젝트 추가" className="header-action-btn-new">
+          <PlusIcon size={16} />
         </button>
         <button
           type="button"
-          onClick={onOpenDetailWindow}
-          title="우측 모니터에 상세 창 열기"
-          className={`header-view-btn-new ${ICON_BTN} text-[16px] leading-none`}
+          onClick={handleOpenDetailWindow}
+          title="듀얼뷰"
+          className={`header-view-btn-new ${detailViewActive ? 'active' : ''}`}
         >
-          🖥
+          <DualMonitorIcon size={16} />
         </button>
       </div>
     </header>

frontend/src/components/dashboard/HeaderIcons.tsx

@@ -0,0 +1,73 @@
+import type { ReactNode } from 'react';
+
+interface IconProps {
+  size?: number;
+  className?: string;
+}
+
+function LucideSvg({ size = 16, className, children }: IconProps & { children: ReactNode }) {
+  return (
+    <svg
+      width={size}
+      height={size}
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      strokeWidth="2"
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      className={className}
+      aria-hidden
+    >
+      {children}
+    </svg>
+  );
+}
+
+/** 참고 사이트 lucide `users` */
+export function UsersIcon({ size = 16, className }: IconProps) {
+  return (
+    <LucideSvg size={size} className={className}>
+      <path d="M16 21v-2a4 4 0 0 0-4-4H6a4 4 0 0 0-4 4v2" />
+      <path d="M16 3.128a4 4 0 0 1 0 7.744" />
+      <path d="M22 21v-2a4 4 0 0 0-3-3.87" />
+      <circle cx="9" cy="7" r="4" />
+    </LucideSvg>
+  );
+}
+
+/** 참고 사이트 lucide `plus` */
+export function PlusIcon({ size = 16, className }: IconProps) {
+  return (
+    <LucideSvg size={size} className={className}>
+      <path d="M5 12h14" />
+      <path d="M12 5v14" />
+    </LucideSvg>
+  );
+}
+
+function MonitorIcon({ size = 16, className }: IconProps) {
+  return (
+    <LucideSvg size={size} className={className}>
+      <rect width="20" height="14" x="2" y="3" rx="2" />
+      <line x1="8" x2="16" y1="21" y2="21" />
+      <line x1="12" x2="12" y1="17" y2="21" />
+    </LucideSvg>
+  );
+}
+
+/** 참고 사이트 `dual-monitor-icon-wrap` — monitor 2개 겹침 */
+export function DualMonitorIcon({ size = 16, className }: IconProps) {
+  const monitorSize = size * 0.75;
+
+  return (
+    <div
+      className={`dual-monitor-icon-wrap ${className ?? ''}`}
+      style={{ width: size, height: size }}
+      aria-hidden
+    >
+      <MonitorIcon size={monitorSize} className="m-icon m-back" />
+      <MonitorIcon size={monitorSize} className="m-icon m-front" />
+    </div>
+  );
+}

frontend/src/index.css

@@ -115,6 +115,78 @@ body,
   gap: 12px;
 }
 
+/* F12 — 헤더 원형 아이콘 버튼 (team / + / 듀얼모니터) */
+.header-action-btn-new,
+.header-view-btn-new,
+.team-status-btn-new {
+  display: flex;
+  flex-shrink: 0;
+  align-items: center;
+  justify-content: center;
+  width: 32px;
+  height: 32px;
+  border: 1.5px solid #1a4d42;
+  border-radius: 50%;
+  color: #cef1eb;
+  cursor: pointer;
+  background: linear-gradient(180deg, #0d3f34 0%, #051f19 100%);
+  box-shadow: 0 0 0 1px #000, 0 2px 2px rgba(0, 0, 0, 0.6);
+  transition: all 0.2s ease-in-out;
+}
+
+.header-action-btn-new svg,
+.header-view-btn-new svg,
+.team-status-btn-new svg {
+  color: inherit;
+  filter: none;
+}
+
+.header-action-btn-new:hover,
+.header-view-btn-new:hover,
+.team-status-btn-new:hover {
+  color: #fff;
+  border-color: #36816d;
+  background: linear-gradient(180deg, #115244 0%, #072b23 100%);
+  transform: translateY(-1px);
+  box-shadow:
+    0 0 0 1px #000,
+    0 0 8px rgba(36, 204, 158, 0.4),
+    0 4px 8px rgba(0, 0, 0, 0.7);
+}
+
+.header-action-btn-new:active,
+.header-action-btn-new.active,
+.header-view-btn-new.active,
+.team-status-btn-new.active {
+  color: #cef1eb;
+  border-color: #1a4d42;
+  background: linear-gradient(180deg, #072b23 0%, #051f19 100%);
+  transform: translateY(0);
+  box-shadow: 0 0 0 1px #000, 0 1px 2px rgba(0, 0, 0, 0.6);
+}
+
+.dual-monitor-icon-wrap {
+  position: relative;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.dual-monitor-icon-wrap .m-icon {
+  position: absolute;
+}
+
+.dual-monitor-icon-wrap .m-back {
+  top: 0;
+  left: -3px;
+  opacity: 0.5;
+}
+
+.dual-monitor-icon-wrap .m-front {
+  right: -3px;
+  bottom: 0;
+}
+
 /* F12 Design Planning Hub — 타이틀 */
 .main_tit {
   color: #bad8ca;