feat: status page shows effective refresh mode across all active clients

- Server tracks each client's refresh rate via query param on /user-downloads
- Active clients expire after 30s of no requests
- Status panel 'Data Refresh' card shows:
  - Background poll interval (or Disabled)
  - Effective mode: Background if all clients >= poll rate,
    Foreground (with rate) if any client is faster, Idle if no clients
  - Active client list with per-user refresh rate and last-seen age
- Foreground mode shown with orange badge for visibility
- Client refresh rate sent on every dashboard request

public/app.js

@@ -213,7 +213,10 @@ async function fetchUserDownloads(isInitialLoad = false) {
   hideError();
   
   try {
-    const url = showAll ? '/api/dashboard/user-downloads?showAll=true' : '/api/dashboard/user-downloads';
+    const params = new URLSearchParams();
+    if (showAll) params.set('showAll', 'true');
+    params.set('refreshRate', currentRefreshRate);
+    const url = '/api/dashboard/user-downloads?' + params.toString();
     const response = await fetch(url);
     const data = await response.json();
     
@@ -624,7 +627,6 @@ function renderStatusPanel(data, panel) {
   const uptime = `${hrs}h ${mins}m ${secs}s`;
 
   const totalKB = (data.cache.totalSizeBytes / 1024).toFixed(1);
-  const refreshLabel = currentRefreshRate > 0 ? (currentRefreshRate / 1000) + 's' : 'Off';
 
   let html = `
     <div class="status-header">
@@ -640,11 +642,38 @@ function renderStatusPanel(data, panel) {
         <div class="status-row"><span>Heap</span><span>${s.heapUsedMB} / ${s.heapTotalMB} MB</span></div>
       </div>
       <div class="status-card">
-        <div class="status-card-title">Polling</div>
-        <div class="status-row"><span>Mode</span><span>${data.polling.enabled ? 'Background' : 'On-demand'}</span></div>
-        ${data.polling.enabled ? `<div class="status-row"><span>Interval</span><span>${data.polling.intervalMs / 1000}s</span></div>` : ''}
-        <div class="status-row"><span>Client refresh</span><span>${refreshLabel}</span></div>
-      </div>`;
+        <div class="status-card-title">Data Refresh</div>`;
+
+  const pollIntervalMs = data.polling.intervalMs;
+  const clients = data.clients || [];
+  const activeRefreshers = clients.filter(c => c.refreshRateMs > 0);
+  const fastestClient = activeRefreshers.length > 0
+    ? activeRefreshers.reduce((min, c) => c.refreshRateMs < min.refreshRateMs ? c : min)
+    : null;
+  const hasForegroundClient = fastestClient && data.polling.enabled && fastestClient.refreshRateMs < pollIntervalMs;
+
+  if (data.polling.enabled) {
+    html += `<div class="status-row"><span>Background poll</span><span>${pollIntervalMs / 1000}s</span></div>`;
+  } else {
+    html += `<div class="status-row"><span>Background poll</span><span>Disabled</span></div>`;
+  }
+
+  if (hasForegroundClient) {
+    html += `<div class="status-row"><span>Effective mode</span><span class="status-fg-badge">Foreground ${fastestClient.refreshRateMs / 1000}s</span></div>`;
+  } else if (activeRefreshers.length > 0) {
+    html += `<div class="status-row"><span>Effective mode</span><span>${data.polling.enabled ? 'Background' : 'On-demand'}</span></div>`;
+  } else {
+    html += `<div class="status-row"><span>Effective mode</span><span>Idle (no active clients)</span></div>`;
+  }
+
+  html += `<div class="status-row"><span>Active clients</span><span>${clients.length}</span></div>`;
+  for (const c of clients) {
+    const rate = c.refreshRateMs > 0 ? (c.refreshRateMs / 1000) + 's' : 'Off';
+    const age = Math.round((Date.now() - c.lastSeen) / 1000);
+    html += `<div class="status-row status-row-sub"><span>${escapeHtml(c.user)}</span><span>${rate} (${age}s ago)</span></div>`;
+  }
+
+  html += `</div>`;
 
   // Poll timings card
   const lp = data.polling.lastPoll;

public/style.css

@@ -862,6 +862,25 @@ body {
   font-size: 0.7rem;
 }
 
+.status-fg-badge {
+  background: #fff3e0;
+  color: #e65100;
+  padding: 1px 8px;
+  border-radius: 8px;
+  font-size: 0.75rem;
+  font-weight: 600;
+}
+
+.status-row-sub {
+  padding-left: 12px;
+  font-size: 0.75rem;
+  opacity: 0.8;
+}
+
+.status-row-sub span:first-child {
+  font-style: italic;
+}
+
 .status-timings {
   display: flex;
   flex-direction: column;

server/routes/dashboard.js

@@ -90,6 +90,19 @@ function getRadarrLink(movie) {
   return `${movie._instanceUrl}/movie/${movie.titleSlug}`;
 }
 
+// Track active dashboard clients: Map<username, { refreshRateMs, lastSeen }>
+const activeClients = new Map();
+const CLIENT_STALE_MS = 30000; // consider client gone after 30s of no requests
+
+function getActiveClients() {
+  const now = Date.now();
+  // Prune stale clients
+  for (const [key, client] of activeClients.entries()) {
+    if (now - client.lastSeen > CLIENT_STALE_MS) activeClients.delete(key);
+  }
+  return Array.from(activeClients.values());
+}
+
 // Get user downloads for authenticated user
 router.get('/user-downloads', async (req, res) => {
   try {
@@ -106,6 +119,15 @@ router.get('/user-downloads', async (req, res) => {
     const showAll = isAdmin && req.query.showAll === 'true';
     console.log(`[Dashboard] Serving downloads for user: ${user.name} (${username}), isAdmin: ${isAdmin}, showAll: ${showAll}`);
 
+    // Track this client's refresh rate
+    const clientRefreshRate = parseInt(req.query.refreshRate, 10);
+    if (clientRefreshRate > 0) {
+      activeClients.set(username, { user: user.name, refreshRateMs: clientRefreshRate, lastSeen: Date.now() });
+    } else {
+      // Client has refresh off or didn't send — still mark as seen but with no rate
+      activeClients.set(username, { user: user.name, refreshRateMs: 0, lastSeen: Date.now() });
+    }
+
     // When polling is disabled, fetch on-demand if cache has expired
     // The fetched data is cached (30s TTL) so subsequent requests from any user reuse it
     if (!POLLING_ENABLED && !cache.get('poll:sab-queue')) {
@@ -628,7 +650,8 @@ router.get('/status', (req, res) => {
         intervalMs: POLLING_ENABLED ? require('../utils/poller').POLL_INTERVAL : 0,
         lastPoll: getLastPollTimings()
       },
-      cache: cacheStats
+      cache: cacheStats,
+      clients: getActiveClients()
     });
   } catch (err) {
     res.status(500).json({ error: 'Failed to get status', details: err.message });