Add contact settings and discovery features

- Implemented contact settings in localization files for Swedish, Ukrainian, and Chinese.
- Added new DiscoveryContact model to handle discovered contacts.
- Created DiscoveryScreen to display discovered contacts with filtering and sorting options.
- Integrated contact discovery storage to persist discovered contacts.
- Updated settings screen to include options for automatic contact addition.
- Enhanced app bar and list filter widgets for better user experience.
- Fixed variable naming inconsistencies in contact model.

lib/l10n/app_localizations.dart

@@ -544,6 +544,18 @@ abstract class AppLocalizations {
   /// **'Longitude'**
   String get settings_longitude;
 
+  /// No description provided for @settings_contactSettings.
+  ///
+  /// In en, this message translates to:
+  /// **'Contact Settings'**
+  String get settings_contactSettings;
+
+  /// No description provided for @settings_contactSettingsSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Settings for how contacts are added.'**
+  String get settings_contactSettingsSubtitle;
+
   /// No description provided for @settings_privacyMode.
   ///
   /// In en, this message translates to:
@@ -5380,6 +5392,102 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Last seen'**
   String get snrIndicator_lastSeen;
+
+  /// No description provided for @contactsSettings_title.
+  ///
+  /// In en, this message translates to:
+  /// **'Contacts settings'**
+  String get contactsSettings_title;
+
+  /// No description provided for @contactsSettings_autoAddTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Automatic Discovery'**
+  String get contactsSettings_autoAddTitle;
+
+  /// No description provided for @contactsSettings_otherTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Other contact related settings'**
+  String get contactsSettings_otherTitle;
+
+  /// No description provided for @contactsSettings_autoAddUsersTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Auto-add users'**
+  String get contactsSettings_autoAddUsersTitle;
+
+  /// No description provided for @contactsSettings_autoAddUsersSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Allow the companion to automatically add discovered users.'**
+  String get contactsSettings_autoAddUsersSubtitle;
+
+  /// No description provided for @contactsSettings_autoAddRepeatersTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Auto-add repeaters'**
+  String get contactsSettings_autoAddRepeatersTitle;
+
+  /// No description provided for @contactsSettings_autoAddRepeatersSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Allow the companion to automatically add discovered repeaters.'**
+  String get contactsSettings_autoAddRepeatersSubtitle;
+
+  /// No description provided for @contactsSettings_autoAddRoomServersTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Auto-add room servers'**
+  String get contactsSettings_autoAddRoomServersTitle;
+
+  /// No description provided for @contactsSettings_autoAddRoomServersSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Allow the companion to automatically add discovered room servers.'**
+  String get contactsSettings_autoAddRoomServersSubtitle;
+
+  /// No description provided for @contactsSettings_autoAddSensorsTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Auto-add sensors'**
+  String get contactsSettings_autoAddSensorsTitle;
+
+  /// No description provided for @contactsSettings_autoAddSensorsSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Allow the companion to automatically add discovered sensors.'**
+  String get contactsSettings_autoAddSensorsSubtitle;
+
+  /// No description provided for @contactsSettings_overwriteOldestTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Overwrite Oldest'**
+  String get contactsSettings_overwriteOldestTitle;
+
+  /// No description provided for @contactsSettings_overwriteOldestSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'When enabled, the companion will overwrite the oldest contact not favoriteited when the contact list is full.'**
+  String get contactsSettings_overwriteOldestSubtitle;
+
+  /// No description provided for @discoveredContacts_Title.
+  ///
+  /// In en, this message translates to:
+  /// **'Discovered Contacts'**
+  String get discoveredContacts_Title;
+
+  /// No description provided for @discoveredContacts_noMatching.
+  ///
+  /// In en, this message translates to:
+  /// **'No matching contacts'**
+  String get discoveredContacts_noMatching;
+
+  /// No description provided for @discoveredContacts_searchHint.
+  ///
+  /// In en, this message translates to:
+  /// **'Search discovered contacts'**
+  String get discoveredContacts_searchHint;
 }
 
 class _AppLocalizationsDelegate