Add device statistics to analytics reports and implement pie chart visualization in admin panel

api/analytics_reports.php

@@ -131,6 +131,27 @@ try {
     $stmtGeo->execute($baseParams);
     $geo = $stmtGeo->fetch() ?: ['geo_passed' => 0, 'geo_failed' => 0, 'geo_bypass' => 0];
 
+    $sqlDeviceStats = "
+        SELECT
+            COALESCE(NULLIF(device_type, ''), 'other') AS device_type,
+            COUNT(*) AS total
+        FROM analytics_events
+        WHERE event_name = 'qr_scan' {$whereWindow}
+        GROUP BY COALESCE(NULLIF(device_type, ''), 'other')
+    ";
+    $stmtDeviceStats = $pdo->prepare($sqlDeviceStats);
+    $stmtDeviceStats->execute($baseParams);
+    $deviceRows = $stmtDeviceStats->fetchAll();
+    $deviceStats = ['ios' => 0, 'android' => 0, 'other' => 0];
+    foreach ($deviceRows as $row) {
+        $key = (string) ($row['device_type'] ?? 'other');
+        if (!isset($deviceStats[$key])) {
+            $deviceStats['other'] += (int) $row['total'];
+        } else {
+            $deviceStats[$key] = (int) $row['total'];
+        }
+    }
+
     $sqlRecentOpens = "
         SELECT
             created_at,
@@ -248,6 +269,7 @@ try {
             'failed' => (int)$geo['geo_failed'],
             'bypass' => (int)$geo['geo_bypass'],
         ],
+        'deviceStats' => $deviceStats,
         'recentOpens' => $recentOpens,
         'guestQueueSummary' => [
             'total' => (int)$queueSummary['total_actions'],