feat(#527): About outbound links (website, Play, donate)

Adds three tappable rows to the About page opening in the external browser via
url_launcher: offband.org, the Google Play listing (app.offband.meshcore), and
offband.org/donate (Ko-fi + GitHub Sponsors options, live-verified). Failure
surfaces a snackbar. Completes epic #525.

Agent: QuietSnow (session 31eaba02)

lib/l10n/app_en.arb

@@ -249,6 +249,10 @@
   "settings_aboutLegalese": "© 2026 Offband. Based on MeshCore Open by zjs81, MIT licensed.",
   "settings_aboutDescription": "Offband Meshcore is an open-source client for MeshCore LoRa mesh networking devices.",
   "settings_aboutLicenses": "View licenses",
+  "settings_aboutWebsite": "Offband website",
+  "settings_aboutPlayStore": "Google Play",
+  "settings_aboutDonate": "Donate or sponsor",
+  "settings_aboutLinkFailed": "Could not open the link",
   "settings_aboutOpenMeteoAttribution": "LOS elevation data: Open-Meteo (CC BY 4.0)",
   "settings_infoName": "Name",
   "settings_infoId": "ID",

lib/l10n/app_localizations.dart

@@ -1210,6 +1210,30 @@ abstract class AppLocalizations {
   /// **'View licenses'**
   String get settings_aboutLicenses;
 
+  /// No description provided for @settings_aboutWebsite.
+  ///
+  /// In en, this message translates to:
+  /// **'Offband website'**
+  String get settings_aboutWebsite;
+
+  /// No description provided for @settings_aboutPlayStore.
+  ///
+  /// In en, this message translates to:
+  /// **'Google Play'**
+  String get settings_aboutPlayStore;
+
+  /// No description provided for @settings_aboutDonate.
+  ///
+  /// In en, this message translates to:
+  /// **'Donate or sponsor'**
+  String get settings_aboutDonate;
+
+  /// No description provided for @settings_aboutLinkFailed.
+  ///
+  /// In en, this message translates to:
+  /// **'Could not open the link'**
+  String get settings_aboutLinkFailed;
+
   /// No description provided for @settings_aboutOpenMeteoAttribution.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_bg.dart

@@ -615,6 +615,18 @@ class AppLocalizationsBg extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Данни за надморска височина на LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_de.dart

@@ -610,6 +610,18 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS-Höhendaten: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_en.dart

@@ -601,6 +601,18 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS elevation data: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_es.dart

@@ -611,6 +611,18 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Datos de elevación LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_fr.dart

@@ -615,6 +615,18 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Données d\'élévation LOS : Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_hu.dart

@@ -613,6 +613,18 @@ class AppLocalizationsHu extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS magassági adatok: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_it.dart

@@ -613,6 +613,18 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Dati di elevazione LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_ja.dart

@@ -586,6 +586,18 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS 標高データ：Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_ko.dart

@@ -586,6 +586,18 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS 고도 데이터: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_nl.dart

@@ -607,6 +607,18 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS-hoogtegegevens: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_pl.dart

@@ -615,6 +615,18 @@ class AppLocalizationsPl extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Dane wysokościowe LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_pt.dart

@@ -613,6 +613,18 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Dados de elevação LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_ru.dart

@@ -612,6 +612,18 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Данные о высоте LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_sk.dart

@@ -607,6 +607,18 @@ class AppLocalizationsSk extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Údaje o nadmorskej výške LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_sl.dart

@@ -604,6 +604,18 @@ class AppLocalizationsSl extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Podatki o višini LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_sv.dart

@@ -602,6 +602,18 @@ class AppLocalizationsSv extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS-höjddata: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_uk.dart

@@ -610,6 +610,18 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'Дані про висоту LOS: Open-Meteo (CC BY 4.0)';

lib/l10n/app_localizations_zh.dart

@@ -578,6 +578,18 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get settings_aboutLicenses => 'View licenses';
 
+  @override
+  String get settings_aboutWebsite => 'Offband website';
+
+  @override
+  String get settings_aboutPlayStore => 'Google Play';
+
+  @override
+  String get settings_aboutDonate => 'Donate or sponsor';
+
+  @override
+  String get settings_aboutLinkFailed => 'Could not open the link';
+
   @override
   String get settings_aboutOpenMeteoAttribution =>
       'LOS 高程数据:Open-Meteo (CC BY 4.0)';

lib/screens/settings_screen.dart

@@ -7,6 +7,7 @@ import 'package:meshcore_open/utils/gpx_export.dart';
 import 'package:meshcore_open/widgets/elements_ui.dart';
 import 'package:provider/provider.dart';
 import 'package:package_info_plus/package_info_plus.dart';
+import 'package:url_launcher/url_launcher.dart';
 
 import '../connector/meshcore_connector.dart';
 import '../connector/meshcore_protocol.dart';
@@ -801,6 +802,27 @@ class _SettingsScreenState extends State<SettingsScreen> {
                 ),
               ),
               const Divider(height: 1),
+              ListTile(
+                leading: const Icon(Icons.language),
+                title: Text(l10n.settings_aboutWebsite),
+                trailing: const Icon(Icons.open_in_new, size: 18),
+                onTap: () => _openExternalUrl('https://offband.org'),
+              ),
+              ListTile(
+                leading: const Icon(Icons.shop_outlined),
+                title: Text(l10n.settings_aboutPlayStore),
+                trailing: const Icon(Icons.open_in_new, size: 18),
+                onTap: () => _openExternalUrl(
+                  'https://play.google.com/store/apps/details?id=app.offband.meshcore',
+                ),
+              ),
+              ListTile(
+                leading: const Icon(Icons.favorite_outline),
+                title: Text(l10n.settings_aboutDonate),
+                trailing: const Icon(Icons.open_in_new, size: 18),
+                onTap: () => _openExternalUrl('https://offband.org/donate'),
+              ),
+              const Divider(height: 1),
               ListTile(
                 leading: const Icon(Icons.description_outlined),
                 title: Text(l10n.settings_aboutLicenses),
@@ -819,6 +841,24 @@ class _SettingsScreenState extends State<SettingsScreen> {
     );
   }
 
+  Future<void> _openExternalUrl(String url) async {
+    try {
+      if (await launchUrl(
+        Uri.parse(url),
+        mode: LaunchMode.externalApplication,
+      )) {
+        return;
+      }
+    } catch (_) {
+      // fall through to the failure message
+    }
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(context.l10n.settings_aboutLinkFailed)),
+      );
+    }
+  }
+
   Widget _buildDebugCard(BuildContext context) {
     final l10n = context.l10n;
     final settingsService = context.watch<AppSettingsService>();

untranslated.json

@@ -24,6 +24,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -128,6 +132,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -232,6 +240,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -336,6 +348,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -440,6 +456,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -544,6 +564,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -648,6 +672,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -752,6 +780,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -856,6 +888,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -960,6 +996,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1064,6 +1104,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1168,6 +1212,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1272,6 +1320,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1376,6 +1428,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1480,6 +1536,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1584,6 +1644,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",
@@ -1688,6 +1752,10 @@
     "settings_experimentalAlreadyUnlocked",
     "settings_experimentalCountdown",
     "settings_aboutLicenses",
+    "settings_aboutWebsite",
+    "settings_aboutPlayStore",
+    "settings_aboutDonate",
+    "settings_aboutLinkFailed",
     "settings_infoFirmware",
     "settings_infoModel",
     "settings_infoOffbandCaps",