✨ Enrich user profile settings

lib/services/time.dart

@@ -0,0 +1,18 @@
+extension DurationFormatter on Duration {
+  String formatDuration() {
+    final isNegative = inMicroseconds < 0;
+    final positiveDuration = isNegative ? -this : this;
+
+    final hours = positiveDuration.inHours.toString().padLeft(2, '0');
+    final minutes = (positiveDuration.inMinutes % 60).toString().padLeft(
+      2,
+      '0',
+    );
+    final seconds = (positiveDuration.inSeconds % 60).toString().padLeft(
+      2,
+      '0',
+    );
+
+    return '${isNegative ? '-' : ''}$hours:$minutes:$seconds';
+  }
+}

lib/services/timezone.dart

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+export 'timezone/native.dart' if (dart.library.html) 'timezone/web.dart';

lib/services/timezone/native.dart

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+import 'package:flutter_timezone/flutter_timezone.dart';
+import 'package:timezone/standalone.dart' as tz;
+import 'package:timezone/data/latest_all.dart' as tzdb;
+
+Future<void> initializeTzdb() async {
+  tzdb.initializeTimeZones();
+}
+
+(Duration offset, DateTime now) getTzInfo(String name) {
+  final location = tz.getLocation(name);
+  final now = tz.TZDateTime.now(location);
+  final offset = now.timeZoneOffset;
+  return (offset, now);
+}
+
+Future<String> getMachineTz() async {
+  return await FlutterTimezone.getLocalTimezone();
+}
+
+List<String> getAvailableTz() {
+  return tz.timeZoneDatabase.locations.keys.toList();
+}

lib/services/timezone/web.dart

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+import 'package:flutter_timezone/flutter_timezone.dart';
+import 'package:timezone/browser.dart' as tz;
+
+Future<void> initializeTzdb() async {
+  await tz.initializeTimeZone();
+}
+
+(Duration offset, DateTime now) getTzInfo(String name) {
+  final location = tz.getLocation(name);
+  final now = tz.TZDateTime.now(location);
+  final offset = now.timeZoneOffset;
+  return (offset, now);
+}
+
+Future<String> getMachineTz() async {
+  return await FlutterTimezone.getLocalTimezone();
+}
+
+List<String> getAvailableTz() {
+  return tz.timeZoneDatabase.locations.keys.toList();
+}