chore: normalize line endings (CRLF -> LF)

No content changes: git diff --ignore-all-space over these files is empty.
The churn came from editing on Windows against a repo checked out with LF.

lib/features/camera/scan_mode_provider.dart

@@ -1,3 +1,3 @@
-import 'package:flutter_riverpod/flutter_riverpod.dart';
-
-final scanModeProvider = StateProvider<String>((ref) => 'DO');
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+final scanModeProvider = StateProvider<String>((ref) => 'DO');