Attendance validation involving Location Detection + Facial Recoginition with Liveness Detection

lib/services/face_verification_stub.dart

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+import 'dart:typed_data';
+
+import 'package:flutter/widgets.dart';
+
+/// Result from a face liveness check.
+class FaceLivenessResult {
+  final Uint8List imageBytes;
+  final String? imagePath;
+  FaceLivenessResult({required this.imageBytes, this.imagePath});
+}
+
+/// Run face liveness detection. Returns captured photo or null if cancelled.
+/// Stub implementation for unsupported platforms.
+Future<FaceLivenessResult?> runFaceLiveness(
+  BuildContext context, {
+  int requiredBlinks = 3,
+}) async {
+  return null;
+}
+
+/// Compare a captured face photo with enrolled face photo bytes.
+/// Returns similarity score 0.0 (no match) to 1.0 (perfect match).
+/// Stub returns 0.0.
+Future<double> compareFaces(
+  Uint8List capturedBytes,
+  Uint8List enrolledBytes,
+) async {
+  return 0.0;
+}