refactor(mobile): Migrate durationInSeconds to durationMs (#26615)

mobile/lib/extensions/string_extensions.dart

@@ -7,11 +7,16 @@ extension StringExtension on String {
 }
 
 extension DurationExtension on String {
-  /// Parses and returns the string of format HH:MM:SS as a duration object else null
+  /// Parses and returns the string of format HH:MM:SS.ffffff as a duration object else null
   Duration? toDuration() {
     try {
-      final parts = split(':').map((e) => double.parse(e).toInt()).toList(growable: false);
-      return Duration(hours: parts[0], minutes: parts[1], seconds: parts[2]);
+      final parts = split(':');
+      final hours = double.parse(parts[0]).toInt();
+      final minutes = double.parse(parts[1]).toInt();
+      final secondsParts = parts[2].split('.');
+      final seconds = int.parse(secondsParts[0]);
+      final milliseconds = secondsParts.length > 1 ? (double.parse('0.${secondsParts[1]}') * 1000).round() : 0;
+      return Duration(hours: hours, minutes: minutes, seconds: seconds, milliseconds: milliseconds);
     } catch (e) {
       return null;
     }