feat: add AI Models card to Status page with connection test button

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/pages/Status/StatusPage.tsx

@@ -3,6 +3,8 @@ import { Topbar } from '../../components/layout/Topbar';
 import { Search, Upload, Download, RefreshCw, CheckCircle, XCircle, AlertTriangle, Info } from 'lucide-react';
 import { UploadModal } from '../Docs/UploadModal';
 import { useLanguage } from '../../contexts/LanguageContext';
+import { getModelUsage, pingModelConnections } from '../../api/status';
+import type { ModelUsageEntry } from '../../api/index';
 
 const TOKEN_KEY = 'auth_token';
 function authHeader(): Record<string, string> {
@@ -85,22 +87,29 @@ export function StatusPage() {
   const [refreshKey, setRefreshKey] = useState(0);
   const [showUpload, setShowUpload] = useState(false);
   const [lastRefresh, setLastRefresh] = useState<Date | null>(null);
+  const [modelUsage, setModelUsage] = useState<ModelUsageEntry[] | null>(null);
+  const [pinging, setPinging] = useState(false);
 
   useEffect(() => {
     setLoading(true);
     setHealthLoading(true);
 
-    // Fetch all three endpoints in parallel
+    // Fetch all endpoints in parallel. The first three use raw fetch() (legacy
+    // pattern already established in this file); model usage uses the typed
+    // fetchAPI-based client from api/status.ts — new code should prefer that.
     Promise.allSettled([
       fetch('/api/v1/status/stats', { headers: authHeader() }).then(r => r.json()),
       fetch('/api/v1/status/health', { headers: authHeader() }).then(r => r.json()),
       fetch('/api/v1/status/config', { headers: authHeader() }).then(r => r.json()),
-    ]).then(([statsRes, healthRes, configRes]) => {
+      getModelUsage(),
+    ]).then(([statsRes, healthRes, configRes, modelsRes]) => {
       if (statsRes.status === 'fulfilled') setStats(statsRes.value);
       else setStats({ documents_total: 0, documents_indexed: 0, documents_failed: 0, chunks_total: 0 });
 
       if (healthRes.status === 'fulfilled') setHealth(healthRes.value);
       if (configRes.status === 'fulfilled') setConfig(configRes.value);
+      if (modelsRes.status === 'fulfilled') setModelUsage(modelsRes.value.models);
+      else setModelUsage(null);
 
       setLoading(false);
       setHealthLoading(false);
@@ -136,6 +145,38 @@ export function StatusPage() {
     URL.revokeObjectURL(url);
   }
 
+  async function handleTestConnections() {
+    setPinging(true);
+    try {
+      const res = await pingModelConnections();
+      setModelUsage(res.models);
+    } catch {
+      // Leave modelUsage as-is; the card below already shows a muted
+      // "never_called"/error state per row when data can't be refreshed.
+    } finally {
+      setPinging(false);
+    }
+  }
+
+  function modelBadgeStatus(status: ModelUsageEntry['status']): 'ok' | 'error' | 'warn' | 'info' {
+    if (status === 'ok') return 'ok';
+    if (status === 'error') return 'error';
+    if (status === 'disabled') return 'info';
+    return 'info'; // never_called
+  }
+
+  function modelStatusLabel(entry: ModelUsageEntry): string {
+    if (entry.status === 'never_called') return t.status.modelStatusNeverCalled;
+    if (entry.status === 'disabled') return t.status.modelStatusDisabled;
+    return entry.status === 'ok' ? t.status.badgeOnline : t.status.badgeError;
+  }
+
+  /** Small relative-ish hint shown next to provider/model — "Never" or a local time string. */
+  function modelLastCalledLabel(entry: ModelUsageEntry): string {
+    if (!entry.last_called_at) return t.status.lastCalledNever;
+    return new Date(entry.last_called_at).toLocaleTimeString(undefined, { hour: '2-digit', minute: '2-digit' });
+  }
+
   return (
     <div className="status-page">
       <Topbar
@@ -254,6 +295,50 @@ export function StatusPage() {
               )}
             </div>
 
+            {/* AI Models — connection status + cumulative token usage */}
+            <div className="card">
+              <div className="card-header" style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
+                <span>{t.status.cardModels}</span>
+                <button className="btn sm" onClick={handleTestConnections} disabled={pinging}>
+                  {pinging ? t.status.testingBtn : t.status.testConnectionBtn}
+                </button>
+              </div>
+
+              {!modelUsage ? (
+                <div style={{ padding: '12px 0', display: 'flex', flexDirection: 'column', gap: 10 }}>
+                  {[1, 2, 3, 4].map(i => (
+                    <div key={i} className="loading-shimmer" style={{ height: 28, borderRadius: 6 }} />
+                  ))}
+                </div>
+              ) : (
+                modelUsage.map(entry => {
+                  const roleLabel = entry.role === 'main_llm' ? t.status.roleMainLlm
+                    : entry.role === 'hyde_llm' ? t.status.roleHydeLlm
+                    : entry.role === 'embedding' ? t.status.roleEmbedding
+                    : t.status.roleReranker;
+                  return (
+                    <div className="service-row" key={entry.role}>
+                      <StatusIcon status={modelBadgeStatus(entry.status)} />
+                      <span className="service-name" style={{ marginLeft: 8 }}>{roleLabel}</span>
+                      <span style={{ fontSize: 11, color: 'var(--muted)', marginLeft: 6, fontFamily: 'var(--font-mono)' }}>
+                        {entry.provider}/{entry.model}
+                        {entry.shares_usage_with && ` · ${t.status.sharesUsageWithMain}`}
+                        {` · ${modelLastCalledLabel(entry)}`}
+                      </span>
+                      <span style={{ marginLeft: 'auto', fontFamily: 'var(--font-mono)', fontSize: 12, color: 'var(--fg)' }}>
+                        {entry.total_tokens > 0 || entry.status === 'ok' || entry.status === 'error'
+                          ? entry.total_tokens.toLocaleString()
+                          : '—'}
+                      </span>
+                      <span className={`status ${modelBadgeStatus(entry.status)}`} style={{ marginLeft: 8 }}>
+                        {modelStatusLabel(entry)}
+                      </span>
+                    </div>
+                  );
+                })
+              )}
+            </div>
+
             {/* System config (collapsible) */}
             <div className="card">
               <button
@@ -335,12 +420,6 @@ export function StatusPage() {
                     <span style={{ color: 'var(--muted)' }}>{t.status.labelSessionCapacity}</span>
                     <span style={{ fontFamily: 'var(--font-mono)' }}>{health.sessions.max}</span>
                   </div>
-                  <div style={{ display: 'flex', justifyContent: 'space-between', fontSize: 12, padding: '4px 0' }}>
-                    <span style={{ color: 'var(--muted)' }}>{t.status.labelReranker}</span>
-                    <span style={{ fontFamily: 'var(--font-mono)', color: health.reranker.enabled ? 'var(--ok)' : 'var(--muted)' }}>
-                      {health.reranker.enabled ? (health.reranker.model ?? t.status.serviceEnabled) : t.status.serviceDisabled}
-                    </span>
-                  </div>
                   <div style={{ display: 'flex', justifyContent: 'space-between', fontSize: 12, padding: '4px 0' }}>
                     <span style={{ color: 'var(--muted)' }}>{t.status.labelBM25}</span>
                     <span style={{ fontFamily: 'var(--font-mono)', color: health.bm25.available ? 'var(--ok)' : 'var(--muted)' }}>