feat(frontend): supervisor presence indicator on agent call card

- useAgentState hook returns { state, supervisorPresence }
- SSE events: supervisor-whisper → "Supervisor coaching" (blue badge)
  supervisor-barge → "Supervisor on call" (brand badge)
  supervisor-left → badge disappears
- Listen mode is silent — no badge shown
- Updated call sites: sidebar.tsx, agent-status-toggle.tsx destructure

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/call-desk/active-call-card.tsx

@@ -18,6 +18,7 @@ import { EnquiryForm } from './enquiry-form';
 import { formatPhone } from '@/lib/format';
 import { apiClient } from '@/lib/api-client';
 import { useAuth } from '@/providers/auth-provider';
+import { useAgentState } from '@/hooks/use-agent-state';
 import { cx } from '@/utils/cx';
 import { notify } from '@/lib/toast';
 import type { Lead, CallDisposition } from '@/types/entities';
@@ -49,6 +50,10 @@ export const ActiveCallCard = ({ lead, callerPhone, missedCallId, onCallComplete
     const [callerDisconnected, setCallerDisconnected] = useState(false);
     const [suggestedDisposition, setSuggestedDisposition] = useState<CallDisposition | null>(null);
 
+    const agentConfig = localStorage.getItem('helix_agent_config');
+    const agentIdForState = agentConfig ? (() => { try { return JSON.parse(agentConfig).ozonetelAgentId; } catch { return null; } })() : null;
+    const { supervisorPresence } = useAgentState(agentIdForState);
+
     const callDirectionRef = useRef(callState === 'ringing-out' ? 'OUTBOUND' : 'INBOUND');
     const wasAnsweredRef = useRef(callState === 'active');
 
@@ -235,7 +240,15 @@ export const ActiveCallCard = ({ lead, callerPhone, missedCallId, onCallComplete
                                     {fullName && <p className="text-xs text-tertiary">{phoneDisplay}</p>}
                                 </div>
                             </div>
-                            <Badge size="md" color="success" type="pill-color">{formatDuration(callDuration)}</Badge>
+                            <div className="flex items-center gap-2">
+                                {supervisorPresence === 'whisper' && (
+                                    <Badge size="sm" color="blue" type="pill-color">Supervisor coaching</Badge>
+                                )}
+                                {supervisorPresence === 'barge' && (
+                                    <Badge size="sm" color="brand" type="pill-color">Supervisor on call</Badge>
+                                )}
+                                <Badge size="md" color="success" type="pill-color">{formatDuration(callDuration)}</Badge>
+                            </div>
                         </div>
 
                         {/* Call controls */}

src/components/call-desk/agent-status-toggle.tsx

@@ -33,7 +33,7 @@ type AgentStatusToggleProps = {
 export const AgentStatusToggle = ({ isRegistered, connectionStatus }: AgentStatusToggleProps) => {
     const agentConfig = localStorage.getItem('helix_agent_config');
     const agentId = agentConfig ? JSON.parse(agentConfig).ozonetelAgentId : null;
-    const ozonetelState = useAgentState(agentId);
+    const { state: ozonetelState } = useAgentState(agentId);
 
     const [menuOpen, setMenuOpen] = useState(false);
     const [changing, setChanging] = useState(false);

src/components/layout/sidebar.tsx

@@ -132,7 +132,7 @@ export const Sidebar = ({ activeUrl = "/" }: SidebarProps) => {
     const [collapsed, setCollapsed] = useAtom(sidebarCollapsedAtom);
     const agentConfig = typeof window !== 'undefined' ? localStorage.getItem('helix_agent_config') : null;
     const agentId = agentConfig ? (() => { try { return JSON.parse(agentConfig).ozonetelAgentId; } catch { return null; } })() : null;
-    const ozonetelState = useAgentState(agentId);
+    const { state: ozonetelState } = useAgentState(agentId);
     const avatarStatus: 'online' | 'offline' = ozonetelState === 'ready' ? 'online' : 'offline';
 
     const width = collapsed ? COLLAPSED_WIDTH : EXPANDED_WIDTH;

src/hooks/use-agent-state.ts

@@ -2,11 +2,13 @@ import { useState, useEffect, useRef } from 'react';
 import { notify } from '@/lib/toast';
 
 export type OzonetelState = 'ready' | 'break' | 'training' | 'calling' | 'in-call' | 'acw' | 'offline';
+export type SupervisorPresence = 'none' | 'whisper' | 'barge';
 
 const API_URL = import.meta.env.VITE_API_URL ?? 'http://localhost:4100';
 
-export const useAgentState = (agentId: string | null): OzonetelState => {
+export const useAgentState = (agentId: string | null): { state: OzonetelState; supervisorPresence: SupervisorPresence } => {
     const [state, setState] = useState<OzonetelState>('offline');
+    const [supervisorPresence, setSupervisorPresence] = useState<SupervisorPresence>('none');
     const prevStateRef = useRef<OzonetelState>('offline');
     const esRef = useRef<EventSource | null>(null);
 
@@ -56,6 +58,20 @@ export const useAgentState = (agentId: string | null): OzonetelState => {
                     return;
                 }
 
+                // Supervisor presence events — don't replace agent state
+                if (data.state === 'supervisor-whisper') {
+                    setSupervisorPresence('whisper');
+                    return;
+                }
+                if (data.state === 'supervisor-barge') {
+                    setSupervisorPresence('barge');
+                    return;
+                }
+                if (data.state === 'supervisor-left') {
+                    setSupervisorPresence('none');
+                    return;
+                }
+
                 prevStateRef.current = data.state;
                 setState(data.state);
             } catch {
@@ -74,5 +90,5 @@ export const useAgentState = (agentId: string | null): OzonetelState => {
         };
     }, [agentId]);
 
-    return state;
+    return { state, supervisorPresence };
 };