feat(todo): Settings' Tasks and Reminders, with Snooze on a reminder (ADR 0033, D4)

Settings gains Todo's own groups, kept in the person's sealed settings
row on every device. Tasks: the weekday weeks start on (the language's
unless set), which the week strip, the date and repeat pickers and the
filters follow; and whether a recurring task done opens its sub-tasks
again (on at first). Reminders: an automatic reminder (none at first)
that TaskRepository writes into a task gaining a time without reminders
of its own, and how long a reminder is snoozed for (15 minutes at first).

Each reminder's notification has a Snooze action on Android and Linux:
the reminder comes back that much later under an ID of its own,
scheduled from what the notification carries, so on Android with the
app closed too (the plugin's ActionBroadcastReceiver declared); the plan
of the person's reminders leaves snoozed ones alone. iOS, macOS and
Windows get it later.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/todo/halkyon_todo_flutter/lib/l10n/app_localizations.dart

@@ -1425,6 +1425,72 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Later days'**
   String get daysNext;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'Tasks'**
+  String get settingsTasks;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'Start the week on'**
+  String get weekStartTitle;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'As the language has it'**
+  String get weekStartLanguage;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'Reset sub-tasks'**
+  String get resetSubTasksTitle;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'Open them again when a recurring task is done'**
+  String get resetSubTasksHint;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'Automatic reminder'**
+  String get automaticReminderTitle;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'For a task given a time, unless it has reminders of its own'**
+  String get automaticReminderHint;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'None'**
+  String get automaticReminderNone;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'When snoozed'**
+  String get snoozeTitle;
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'{count, plural, =1{1 minute} other{{count} minutes}}'**
+  String snoozeMinutes(int count);
+
+  /// Settings of tasks and reminders (ADR 0033, D4).
+  ///
+  /// In en, this message translates to:
+  /// **'Snooze {count} min'**
+  String reminderSnooze(int count);
 }
 
 class _AppLocalizationsDelegate