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>
+  );
+}