feat(sync): list all linked devices in Sync table

- getSyncStatus() now iterates pass.base.activeWriters and returns
  linkedDevices: [{ id, isCurrent }] for each writer in the sync group
- Dashboard Linked devices table shows every device: "This device" plus
  "Device 2", "Device 3", etc. with their IDs; rows sorted by id
- Fallback to single "This device" row when activeWriters is missing

extension/dashboard/pages/sync.js

@@ -45,10 +45,20 @@ function updateSyncStatus() {
         const tbody = $('syncLinkedDevicesTable');
         if (card) card.style.display = 'block';
         if (tbody) {
-          const deviceId = response.deviceId || '—';
           const syncGroupId = response.syncGroupId || '—';
-          tbody.innerHTML = '<tr><td>This device</td><td class="mono" style="font-size:12px;">' + escapeHtml(deviceId) + '</td></tr>' +
-            '<tr><td>Sync group</td><td class="mono" style="font-size:12px;">' + escapeHtml(syncGroupId) + '</td></tr>';
+          const linkedDevices = Array.isArray(response.linkedDevices) ? response.linkedDevices : [];
+          if (linkedDevices.length > 0) linkedDevices.sort((a, b) => (a.id || '').localeCompare(b.id || ''));
+          let rows = '';
+          if (linkedDevices.length > 0) {
+            linkedDevices.forEach((d, i) => {
+              const label = d.isCurrent ? 'This device' : ('Device ' + (i + 1));
+              rows += '<tr><td>' + escapeHtml(label) + '</td><td class="mono" style="font-size:12px;">' + escapeHtml(d.id || '—') + '</td></tr>';
+            });
+          } else {
+            rows = '<tr><td>This device</td><td class="mono" style="font-size:12px;">' + escapeHtml(response.deviceId || '—') + '</td></tr>';
+          }
+          rows += '<tr><td>Sync group</td><td class="mono" style="font-size:12px;">' + escapeHtml(syncGroupId) + '</td></tr>';
+          tbody.innerHTML = rows;
         }
       } else {
         if (dot) dot.style.background = 'var(--text4)';

native-host/managers/sync-manager.js

@@ -257,9 +257,25 @@ async function getSyncStatus() {
     try {
       out.deviceId = shortId(pass.writerKey) || null;
       out.syncGroupId = shortId(pass.discoveryKey) || null;
+      out.linkedDevices = [];
+      const myKeyHex = b4a.toString(pass.writerKey, 'hex');
+      if (pass.base && pass.base.activeWriters) {
+        for (const w of pass.base.activeWriters) {
+          if (!w || !w.core || !w.core.key) continue;
+          const keyHex = b4a.toString(w.core.key, 'hex');
+          out.linkedDevices.push({
+            id: shortId(w.core.key),
+            isCurrent: keyHex === myKeyHex
+          });
+        }
+      }
+      if (out.linkedDevices.length === 0 && out.deviceId) {
+        out.linkedDevices = [{ id: out.deviceId, isCurrent: true }];
+      }
     } catch (e) {
       out.deviceId = null;
       out.syncGroupId = null;
+      out.linkedDevices = out.deviceId ? [{ id: out.deviceId, isCurrent: true }] : [];
     }
   }
   return out;