Dashboard: Show last sync date/time instead of just checkmark

- Queries server_sync_log for most recent successful sync
- Displays date (e.g., 'Apr 8') and time (e.g., '3:28 AM')
- Shows yellow dash with 'Never' if no syncs recorded

Chronicler #69

services/arbiter-3.0/src/routes/admin/index.js

@@ -42,11 +42,20 @@ router.get('/dashboard', async (req, res) => {
         const activeSubscribers = parseInt(subStats[0]?.active_count || 0);
         const totalMRR = parseFloat(subStats[0]?.mrr || 0);
 
+        // Fetch most recent successful sync time
+        const { rows: syncRows } = await db.query(`
+            SELECT MAX(last_successful_sync) as last_sync
+            FROM server_sync_log
+            WHERE is_online = true
+        `);
+        const lastSyncTime = syncRows[0]?.last_sync || null;
+
         res.render('admin/dashboard', { 
             title: 'Command Bridge',
             serversOnline,
             activeSubscribers,
-            totalMRR
+            totalMRR,
+            lastSyncTime
         });
     } catch (error) {
         console.error('Dashboard data fetch error:', error);
@@ -55,7 +64,8 @@ router.get('/dashboard', async (req, res) => {
             title: 'Command Bridge',
             serversOnline: 0,
             activeSubscribers: 0,
-            totalMRR: 0
+            totalMRR: 0,
+            lastSyncTime: null
         });
     }
 });

services/arbiter-3.0/src/views/admin/dashboard.ejs

@@ -13,7 +13,16 @@
         </div>
         <div class="bg-white dark:bg-darkcard rounded-lg shadow-sm border border-gray-200 dark:border-gray-700 p-6">
             <div class="text-sm text-gray-500 dark:text-gray-400">Last Sync</div>
-            <div class="text-3xl font-bold mt-2 text-green-500">✓</div>
+            <% if (lastSyncTime) { %>
+                <div class="text-xl font-bold mt-2 text-green-500">✓</div>
+                <div class="text-xs text-gray-500 dark:text-gray-400 mt-1">
+                    <%= new Date(lastSyncTime).toLocaleDateString('en-US', { month: 'short', day: 'numeric' }) %>
+                    <%= new Date(lastSyncTime).toLocaleTimeString('en-US', { hour: 'numeric', minute: '2-digit', hour12: true }) %>
+                </div>
+            <% } else { %>
+                <div class="text-xl font-bold mt-2 text-yellow-500">—</div>
+                <div class="text-xs text-gray-500 dark:text-gray-400 mt-1">Never</div>
+            <% } %>
         </div>
     </div>