feat(agent-office): AgentCard component with state dot + badge

- state→color mapping via STATE_COLORS
- notification badge with 9+ overflow
- active prop for selected card border

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/pages/agent-office/components/AgentCard.jsx

@@ -0,0 +1,30 @@
+// src/pages/agent-office/components/AgentCard.jsx
+import { AGENT_META, STATE_COLORS, DEFAULT_STATE_COLOR } from '../constants.js';
+
+export default function AgentCard({ agentId, agentState, notificationCount = 0, active = false, onClick }) {
+  const meta = AGENT_META[agentId];
+  if (!meta) return null;
+
+  const state = agentState?.state || 'idle';
+  const stateInfo = STATE_COLORS[state] || DEFAULT_STATE_COLOR;
+  const dotClass = `ao-card-dot ${state}${stateInfo.pulse ? ' pulse' : ''}`;
+  const badgeText = notificationCount > 9 ? '9+' : String(notificationCount);
+
+  return (
+    <button
+      type="button"
+      className={`ao-card${active ? ' active' : ''}`}
+      onClick={onClick}
+      style={{ '--card-accent': meta.color }}
+    >
+      <span className={dotClass} title={state} />
+      {notificationCount > 0 && (
+        <span className="ao-card-badge">{badgeText}</span>
+      )}
+      <div className="ao-card-image">
+        <img src={meta.image} alt={meta.displayName} />
+      </div>
+      <div className="ao-card-name">{meta.displayName}</div>
+    </button>
+  );
+}

src/pages/agent-office/components/AgentCard.test.jsx

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+// src/pages/agent-office/components/AgentCard.test.jsx
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen, fireEvent } from '@testing-library/react';
+import AgentCard from './AgentCard.jsx';
+
+describe('AgentCard', () => {
+  it('에이전트의 displayName을 표시', () => {
+    render(<AgentCard agentId="stock" agentState={{ state: 'idle' }} notificationCount={0} onClick={() => {}} />);
+    expect(screen.getByText('주식 트레이더')).toBeInTheDocument();
+  });
+
+  it('working 상태일 때 dot에 working 클래스 부여', () => {
+    const { container } = render(
+      <AgentCard agentId="stock" agentState={{ state: 'working' }} notificationCount={0} onClick={() => {}} />
+    );
+    const dot = container.querySelector('.ao-card-dot');
+    expect(dot).toHaveClass('working');
+  });
+
+  it('agentState 없으면 idle로 fallback', () => {
+    const { container } = render(
+      <AgentCard agentId="stock" agentState={undefined} notificationCount={0} onClick={() => {}} />
+    );
+    const dot = container.querySelector('.ao-card-dot');
+    expect(dot).toHaveClass('idle');
+  });
+
+  it('notificationCount > 0이면 뱃지 표시', () => {
+    render(<AgentCard agentId="stock" agentState={{ state: 'idle' }} notificationCount={3} onClick={() => {}} />);
+    expect(screen.getByText('3')).toBeInTheDocument();
+  });
+
+  it('notificationCount === 0이면 뱃지 없음', () => {
+    const { container } = render(
+      <AgentCard agentId="stock" agentState={{ state: 'idle' }} notificationCount={0} onClick={() => {}} />
+    );
+    expect(container.querySelector('.ao-card-badge')).toBeNull();
+  });
+
+  it('notificationCount > 9이면 9+ 표시', () => {
+    render(<AgentCard agentId="stock" agentState={{ state: 'idle' }} notificationCount={15} onClick={() => {}} />);
+    expect(screen.getByText('9+')).toBeInTheDocument();
+  });
+
+  it('클릭 시 onClick 호출', () => {
+    const onClick = vi.fn();
+    const { container } = render(
+      <AgentCard agentId="stock" agentState={{ state: 'idle' }} notificationCount={0} onClick={onClick} />
+    );
+    fireEvent.click(container.querySelector('.ao-card'));
+    expect(onClick).toHaveBeenCalledTimes(1);
+  });
+
+  it('active prop 시 카드에 active 클래스 부여', () => {
+    const { container } = render(
+      <AgentCard agentId="stock" agentState={{ state: 'idle' }} notificationCount={0} active onClick={() => {}} />
+    );
+    expect(container.querySelector('.ao-card')).toHaveClass('active');
+  });
+});