Add faces count

mobile/lib/face/db.dart

@@ -419,6 +419,14 @@ class FaceMLDataDB {
     return result;
   }
 
+  Future<int> getTotalFaceCount() async {
+    final db = await instance.database;
+    final List<Map<String, dynamic>> maps = await db.rawQuery(
+      'SELECT COUNT(*) as count FROM $facesTable WHERE $faceScore > $kMinHighQualityFaceScore AND $faceBlur > $kLaplacianThreshold',
+    );
+    return maps.first['count'] as int;
+  }
+
   Future<void> resetClusterIDs() async {
     final db = await instance.database;
     await db.update(

mobile/lib/ui/settings/debug/face_debug_section_widget.dart

@@ -93,6 +93,23 @@ class _FaceDebugSectionWidgetState extends State<FaceDebugSectionWidget> {
             }
           },
         ),
+        MenuItemWidget(
+          captionedTextWidget: FutureBuilder<int>(
+            future: FaceMLDataDB.instance.getTotalFaceCount(),
+            builder: (context, snapshot) {
+              if (snapshot.hasData) {
+                return CaptionedTextWidget(
+                  title: "${snapshot.data!} high quality faces",
+                );
+              }
+              return const SizedBox.shrink();
+            },
+          ),
+          pressedColor: getEnteColorScheme(context).fillFaint,
+          trailingIcon: Icons.chevron_right_outlined,
+          trailingIconIsMuted: true,
+          onTap: () async {},
+        ),
         MenuItemWidget(
           captionedTextWidget: const CaptionedTextWidget(
             title: "Analyze file ID 25728869",