feat(#509): hidden 7-tap Experimental unlock + settings section

7 taps on the About version row (rolling ~3s window) reveal a neutral
'Experimental' settings category; persisted on AppSettings, survives
restart, re-hidden from a switch inside the section. Empty of toggles
for now (Fast Sync #118, CoreScope #524 land into it later).

Countdown snackbars after tap 4; already-unlocked feedback. Version-text
tap is absorbed so it counts without opening the About dialog.

Agent: QuietSnow (session 31eaba02)

lib/l10n/app_en.arb

@@ -215,6 +215,21 @@
   "settings_rebootDeviceSubtitle": "Restart the MeshCore device",
   "settings_rebootDeviceConfirm": "Are you sure you want to reboot the device? You will be disconnected.",
   "settings_debug": "Debug",
+  "settings_experimental": "Experimental",
+  "settings_experimentalSubtitle": "Advanced and in-development features",
+  "settings_experimentalDescription": "These features are experimental and may change or be removed at any time. They default to off.",
+  "settings_experimentalHide": "Hide this section",
+  "settings_experimentalHideSubtitle": "Re-hide Experimental. Unlock again with 7 taps on the version row.",
+  "settings_experimentalUnlocked": "Experimental features unlocked",
+  "settings_experimentalAlreadyUnlocked": "Experimental features are already unlocked",
+  "settings_experimentalCountdown": "{count} more taps to unlock experimental features",
+  "@settings_experimentalCountdown": {
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
   "settings_companionDebugLog": "Companion Debug Log",
   "settings_companionDebugLogSubtitle": "BLE/TCP/USB commands, responses, and raw data",
   "settings_appDebugLog": "App Debug Log",

lib/l10n/app_localizations.dart

@@ -1090,6 +1090,54 @@ abstract class AppLocalizations {
   /// **'Debug'**
   String get settings_debug;
 
+  /// No description provided for @settings_experimental.
+  ///
+  /// In en, this message translates to:
+  /// **'Experimental'**
+  String get settings_experimental;
+
+  /// No description provided for @settings_experimentalSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Advanced and in-development features'**
+  String get settings_experimentalSubtitle;
+
+  /// No description provided for @settings_experimentalDescription.
+  ///
+  /// In en, this message translates to:
+  /// **'These features are experimental and may change or be removed at any time. They default to off.'**
+  String get settings_experimentalDescription;
+
+  /// No description provided for @settings_experimentalHide.
+  ///
+  /// In en, this message translates to:
+  /// **'Hide this section'**
+  String get settings_experimentalHide;
+
+  /// No description provided for @settings_experimentalHideSubtitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Re-hide Experimental. Unlock again with 7 taps on the version row.'**
+  String get settings_experimentalHideSubtitle;
+
+  /// No description provided for @settings_experimentalUnlocked.
+  ///
+  /// In en, this message translates to:
+  /// **'Experimental features unlocked'**
+  String get settings_experimentalUnlocked;
+
+  /// No description provided for @settings_experimentalAlreadyUnlocked.
+  ///
+  /// In en, this message translates to:
+  /// **'Experimental features are already unlocked'**
+  String get settings_experimentalAlreadyUnlocked;
+
+  /// No description provided for @settings_experimentalCountdown.
+  ///
+  /// In en, this message translates to:
+  /// **'{count} more taps to unlock experimental features'**
+  String settings_experimentalCountdown(int count);
+
   /// No description provided for @settings_companionDebugLog.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_bg.dart

@@ -540,6 +540,36 @@ class AppLocalizationsBg extends AppLocalizations {
   @override
   String get settings_debug => 'Отстрани';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog =>
       'Лог за отстраняване на грешки (за съпътстваща програма)';

lib/l10n/app_localizations_de.dart

@@ -537,6 +537,36 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get settings_debug => 'Fehlerbehebung';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog =>
       'Debug-Protokoll für die Begleitsoftware';

lib/l10n/app_localizations_en.dart

@@ -528,6 +528,36 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get settings_debug => 'Debug';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Companion Debug Log';
 

lib/l10n/app_localizations_es.dart

@@ -538,6 +538,36 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get settings_debug => 'Depurar';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Registro de depuración asociado';
 

lib/l10n/app_localizations_fr.dart

@@ -542,6 +542,36 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get settings_debug => 'Déboguer';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Journal de débogage associé';
 

lib/l10n/app_localizations_hu.dart

@@ -540,6 +540,36 @@ class AppLocalizationsHu extends AppLocalizations {
   @override
   String get settings_debug => 'Hibakeresés';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Párhuzamos hibakeresési napló';
 

lib/l10n/app_localizations_it.dart

@@ -540,6 +540,36 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get settings_debug => 'Risoluzione dei problemi';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Registro di debug per il supporto';
 

lib/l10n/app_localizations_ja.dart

@@ -514,6 +514,36 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get settings_debug => 'デバッグ';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => '同伴デバッグログ';
 

lib/l10n/app_localizations_ko.dart

@@ -514,6 +514,36 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get settings_debug => '디버깅';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => '동반 디버깅 로그';
 

lib/l10n/app_localizations_nl.dart

@@ -534,6 +534,36 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get settings_debug => 'Foutopsporing';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog =>
       'Debuglog voor aanvullende informatie';

lib/l10n/app_localizations_pl.dart

@@ -542,6 +542,36 @@ class AppLocalizationsPl extends AppLocalizations {
   @override
   String get settings_debug => 'Naprawianie błędów';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog =>
       'Log debugowania (dla pomocy w rozwiązywaniu problemów)';

lib/l10n/app_localizations_pt.dart

@@ -540,6 +540,36 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get settings_debug => 'Depurar';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Registro de depuração auxiliar';
 

lib/l10n/app_localizations_ru.dart

@@ -539,6 +539,36 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get settings_debug => 'Отладка';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog =>
       'Журнал отладки (для сопутствующего приложения)';

lib/l10n/app_localizations_sk.dart

@@ -534,6 +534,36 @@ class AppLocalizationsSk extends AppLocalizations {
   @override
   String get settings_debug => 'Ladenie';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog =>
       'Logovanie pre ladenie (sprievodný log)';

lib/l10n/app_localizations_sl.dart

@@ -532,6 +532,36 @@ class AppLocalizationsSl extends AppLocalizations {
   @override
   String get settings_debug => 'Odpravljanje napak';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Log zapis za odpravljanje napak';
 

lib/l10n/app_localizations_sv.dart

@@ -529,6 +529,36 @@ class AppLocalizationsSv extends AppLocalizations {
   @override
   String get settings_debug => 'Felsök';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => 'Följande felsökningslogg';
 

lib/l10n/app_localizations_uk.dart

@@ -536,6 +536,36 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get settings_debug => 'Налагодження';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog =>
       'Журнал відлачування (для супутника)';

lib/l10n/app_localizations_zh.dart

@@ -507,6 +507,36 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get settings_debug => '调试';
 
+  @override
+  String get settings_experimental => 'Experimental';
+
+  @override
+  String get settings_experimentalSubtitle =>
+      'Advanced and in-development features';
+
+  @override
+  String get settings_experimentalDescription =>
+      'These features are experimental and may change or be removed at any time. They default to off.';
+
+  @override
+  String get settings_experimentalHide => 'Hide this section';
+
+  @override
+  String get settings_experimentalHideSubtitle =>
+      'Re-hide Experimental. Unlock again with 7 taps on the version row.';
+
+  @override
+  String get settings_experimentalUnlocked => 'Experimental features unlocked';
+
+  @override
+  String get settings_experimentalAlreadyUnlocked =>
+      'Experimental features are already unlocked';
+
+  @override
+  String settings_experimentalCountdown(int count) {
+    return '$count more taps to unlock experimental features';
+  }
+
   @override
   String get settings_companionDebugLog => '调试日志';
 

lib/models/app_settings.dart

@@ -139,6 +139,11 @@ class AppSettings {
   final String themeMode;
   final String? languageOverride; // null = system default
   final bool appDebugLogEnabled;
+
+  /// Owner-only Experimental settings section, revealed by a 7-tap gesture on
+  /// the version row (#509). Not a security boundary — just keeps advanced/
+  /// me-centric toggles out of the default UI. Persists across restarts.
+  final bool experimentalUnlocked;
   final Map<String, String> batteryChemistryByDeviceId;
   final Map<String, String> batteryChemistryByRepeaterId;
   final UnitSystem unitSystem;
@@ -217,6 +222,7 @@ class AppSettings {
     this.themeMode = 'system',
     this.languageOverride,
     this.appDebugLogEnabled = false,
+    this.experimentalUnlocked = false,
     Map<String, String>? batteryChemistryByDeviceId,
     Map<String, String>? batteryChemistryByRepeaterId,
     this.unitSystem = UnitSystem.metric,
@@ -283,6 +289,7 @@ class AppSettings {
       'theme_mode': themeMode,
       'language_override': languageOverride,
       'app_debug_log_enabled': appDebugLogEnabled,
+      'experimental_unlocked': experimentalUnlocked,
       'battery_chemistry_by_device_id': batteryChemistryByDeviceId,
       'battery_chemistry_by_repeater_id': batteryChemistryByRepeaterId,
       'unit_system': unitSystem.value,
@@ -380,6 +387,7 @@ class AppSettings {
       themeMode: json['theme_mode'] as String? ?? 'system',
       languageOverride: json['language_override'] as String?,
       appDebugLogEnabled: json['app_debug_log_enabled'] as bool? ?? false,
+      experimentalUnlocked: json['experimental_unlocked'] as bool? ?? false,
       batteryChemistryByDeviceId:
           (json['battery_chemistry_by_device_id'] as Map?)?.map(
             (key, value) => MapEntry(key.toString(), value.toString()),
@@ -497,6 +505,7 @@ class AppSettings {
     String? themeMode,
     Object? languageOverride = _unset,
     bool? appDebugLogEnabled,
+    bool? experimentalUnlocked,
     Map<String, String>? batteryChemistryByDeviceId,
     Map<String, String>? batteryChemistryByRepeaterId,
     UnitSystem? unitSystem,
@@ -556,6 +565,7 @@ class AppSettings {
           ? this.languageOverride
           : languageOverride as String?,
       appDebugLogEnabled: appDebugLogEnabled ?? this.appDebugLogEnabled,
+      experimentalUnlocked: experimentalUnlocked ?? this.experimentalUnlocked,
       batteryChemistryByDeviceId:
           batteryChemistryByDeviceId ?? this.batteryChemistryByDeviceId,
       batteryChemistryByRepeaterId:

lib/screens/settings_screen.dart

@@ -55,6 +55,13 @@ class _SettingsScreenState extends State<SettingsScreen> {
   bool _showBatteryVoltage = false;
   String _appVersion = '';
 
+  // #509 hidden unlock: 7 taps on the version row within a rolling window
+  // reveals the Experimental settings section.
+  static const int _experimentalUnlockTaps = 7;
+  static const Duration _experimentalTapWindow = Duration(seconds: 3);
+  int _versionTapCount = 0;
+  DateTime? _lastVersionTap;
+
   @override
   void initState() {
     super.initState();
@@ -69,6 +76,50 @@ class _SettingsScreenState extends State<SettingsScreen> {
     });
   }
 
+  void _handleVersionTap() {
+    final l10n = context.l10n;
+    final settingsService = context.read<AppSettingsService>();
+
+    if (settingsService.settings.experimentalUnlocked) {
+      _versionTapCount = 0;
+      _showVersionSnack(l10n.settings_experimentalAlreadyUnlocked);
+      return;
+    }
+
+    final now = DateTime.now();
+    if (_lastVersionTap == null ||
+        now.difference(_lastVersionTap!) > _experimentalTapWindow) {
+      _versionTapCount = 0;
+    }
+    _lastVersionTap = now;
+    _versionTapCount++;
+
+    final remaining = _experimentalUnlockTaps - _versionTapCount;
+    if (remaining <= 0) {
+      _versionTapCount = 0;
+      settingsService.setExperimentalUnlocked(true);
+      _showVersionSnack(l10n.settings_experimentalUnlocked);
+    } else if (remaining <= 3) {
+      _showVersionSnack(
+        l10n.settings_experimentalCountdown(remaining),
+        brief: true,
+      );
+    }
+  }
+
+  void _showVersionSnack(String message, {bool brief = false}) {
+    ScaffoldMessenger.of(context)
+      ..hideCurrentSnackBar()
+      ..showSnackBar(
+        SnackBar(
+          content: Text(message),
+          duration: brief
+              ? const Duration(milliseconds: 900)
+              : const Duration(seconds: 2),
+        ),
+      );
+  }
+
   @override
   Widget build(BuildContext context) {
     final l10n = context.l10n;
@@ -90,6 +141,12 @@ class _SettingsScreenState extends State<SettingsScreen> {
         offbandCaps: c.offbandCaps ?? 0,
       ),
     );
+    // Owner-only Experimental section (#509), revealed by the 7-tap gesture on
+    // the About version row. Selects narrowly so the category list only rebuilds
+    // when the flag flips, not on every connector update (same reason as above).
+    final experimentalUnlocked = context.select<AppSettingsService, bool>(
+      (s) => s.settings.experimentalUnlocked,
+    );
     return [
       SettingsCategory(
         icon: Icons.badge_outlined,
@@ -155,6 +212,13 @@ class _SettingsScreenState extends State<SettingsScreen> {
         title: l10n.settings_actions,
         builder: _actionsPane,
       ),
+      if (experimentalUnlocked)
+        SettingsCategory(
+          icon: Icons.science_outlined,
+          title: l10n.settings_experimental,
+          subtitle: l10n.settings_experimentalSubtitle,
+          builder: _experimentalPane,
+        ),
       SettingsCategory(
         icon: Icons.build_outlined,
         title: l10n.settings_debug,
@@ -163,6 +227,38 @@ class _SettingsScreenState extends State<SettingsScreen> {
     ];
   }
 
+  Widget _experimentalPane(BuildContext context) {
+    final l10n = context.l10n;
+    final settingsService = context.watch<AppSettingsService>();
+    return ListView(
+      padding: const EdgeInsets.all(16),
+      children: [
+        Card(
+          child: Padding(
+            padding: const EdgeInsets.all(16),
+            child: Text(l10n.settings_experimentalDescription),
+          ),
+        ),
+        const SizedBox(height: 16),
+        // Future me-centric/experimental toggles land here (e.g. Fast Sync
+        // #118, CoreScope repeats #524). Empty of features until they arrive.
+        Card(
+          child: SwitchListTile(
+            secondary: const Icon(Icons.visibility_off_outlined),
+            title: Text(l10n.settings_experimentalHide),
+            subtitle: Text(l10n.settings_experimentalHideSubtitle),
+            value: settingsService.settings.experimentalUnlocked,
+            onChanged: (value) {
+              if (!value) {
+                settingsService.setExperimentalUnlocked(false);
+              }
+            },
+          ),
+        ),
+      ],
+    );
+  }
+
   Widget _observerPane(BuildContext context) => const ObserverSettingsView();
 
   Widget _blockedPane(BuildContext context) => const BlockedView();
@@ -637,9 +733,15 @@ class _SettingsScreenState extends State<SettingsScreen> {
       child: ListTile(
         leading: const Icon(Icons.info_outline),
         title: Text(l10n.settings_about),
-        subtitle: Text(
-          l10n.settings_aboutVersion(
-            _appVersion.isEmpty ? l10n.common_loading : _appVersion,
+        // Tapping the version number counts toward the #509 unlock and is
+        // absorbed here; tapping elsewhere on the row still opens the dialog.
+        subtitle: GestureDetector(
+          behavior: HitTestBehavior.opaque,
+          onTap: _handleVersionTap,
+          child: Text(
+            l10n.settings_aboutVersion(
+              _appVersion.isEmpty ? l10n.common_loading : _appVersion,
+            ),
           ),
         ),
         onTap: () => _showAbout(context),

lib/services/app_settings_service.dart

@@ -182,6 +182,10 @@ class AppSettingsService extends ChangeNotifier {
     appLogger.setEnabled(value);
   }
 
+  Future<void> setExperimentalUnlocked(bool value) async {
+    await updateSettings(_settings.copyWith(experimentalUnlocked: value));
+  }
+
   Future<void> setMapShowDiscoveryContacts(bool value) async {
     await updateSettings(_settings.copyWith(mapShowDiscoveryContacts: value));
   }

test/models/model_changes_test.dart

@@ -278,6 +278,20 @@ void main() {
       expect(settings.maxMessageRetries, equals(5));
     });
 
+    test('experimentalUnlocked defaults off and round-trips (#509)', () {
+      expect(AppSettings().experimentalUnlocked, isFalse);
+
+      final unlocked = AppSettings().copyWith(experimentalUnlocked: true);
+      expect(unlocked.experimentalUnlocked, isTrue);
+      expect(unlocked.toJson()['experimental_unlocked'], isTrue);
+
+      final restored = AppSettings.fromJson(unlocked.toJson());
+      expect(restored.experimentalUnlocked, isTrue);
+
+      // Missing key (older persisted settings) defaults to locked.
+      expect(AppSettings.fromJson({}).experimentalUnlocked, isFalse);
+    });
+
     test('toJson includes all new fields', () {
       final settings = AppSettings();
       final json = settings.toJson();

untranslated.json

@@ -12,6 +12,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -30,11 +38,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -63,7 +85,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "de": [
@@ -79,6 +108,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -97,11 +134,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -130,7 +181,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "es": [
@@ -146,6 +204,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -164,11 +230,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -197,7 +277,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "fr": [
@@ -213,6 +300,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -231,11 +326,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -264,7 +373,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "hu": [
@@ -280,6 +396,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -298,11 +422,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -331,7 +469,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "it": [
@@ -347,6 +492,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -365,11 +518,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -398,7 +565,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "ja": [
@@ -414,6 +588,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -432,11 +614,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -465,7 +661,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "ko": [
@@ -481,6 +684,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -499,11 +710,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -532,7 +757,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "nl": [
@@ -548,6 +780,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -566,11 +806,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -599,7 +853,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "pl": [
@@ -615,6 +876,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -633,11 +902,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -666,7 +949,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "pt": [
@@ -682,6 +972,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -700,11 +998,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -733,7 +1045,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "ru": [
@@ -749,6 +1068,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -767,11 +1094,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -800,7 +1141,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "sk": [
@@ -816,6 +1164,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -834,11 +1190,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -867,7 +1237,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "sl": [
@@ -883,6 +1260,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -901,11 +1286,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -934,7 +1333,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "sv": [
@@ -950,6 +1356,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -968,11 +1382,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -1001,7 +1429,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "uk": [
@@ -1017,6 +1452,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1035,11 +1478,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -1068,7 +1525,14 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ],
 
   "zh": [
@@ -1084,6 +1548,14 @@
     "settings_gpsStatusTime",
     "settings_gpsStatusTapRefresh",
     "settings_gpsStatusNoResponse",
+    "settings_experimental",
+    "settings_experimentalSubtitle",
+    "settings_experimentalDescription",
+    "settings_experimentalHide",
+    "settings_experimentalHideSubtitle",
+    "settings_experimentalUnlocked",
+    "settings_experimentalAlreadyUnlocked",
+    "settings_experimentalCountdown",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1102,11 +1574,25 @@
     "channels_notifyAll",
     "channels_notifyMentionsOnly",
     "channels_notifyOff",
+    "chat_sendingAgain",
+    "message_sendAgain",
     "chat_replyWithRoute",
+    "debugLog_shareLog",
+    "debugLog_saveLog",
+    "debugLog_downloadLog",
+    "debugLog_shareSubject",
+    "debugLog_logSaved",
+    "debugLog_logUnavailable",
     "channel_heardTooltip",
     "map_alwaysShowNames",
     "path_suggestedRoute",
     "path_searchRepeaters",
+    "channelPath_routeDirect",
+    "channelPath_routeFlood",
+    "channelPath_snrLabel",
+    "channelPath_snrValue",
+    "channelPath_rssiLabel",
+    "channelPath_rssiValue",
     "channels_shareQr",
     "channels_shareQrTitle",
     "channels_shareQrInstructions",
@@ -1135,6 +1621,13 @@
     "block_namesHint",
     "block_offloadActive",
     "block_offloadStoreFull",
-    "block_composerNotice"
+    "block_composerNotice",
+    "storageUnavailableTitle",
+    "storageUnavailableBody",
+    "batteryOptimizationTitle",
+    "batteryOptimizationBody",
+    "batteryOptimizationOpenSettings",
+    "batteryOptimizationDismiss",
+    "batteryOptimizationOpenFailed"
   ]
 }