feat(#180): offload error visibility + capability signal for UI

Connector parses ADD/REMOVE/CLEAR replies; ADD ok=0 (node store full at 32) sets
blockOffloadStoreFull (local stays authoritative), cleared on reconcile. BlockedView
shows a firmware-offload status row when supportsOffbandBlock — 'active', or a
'radio block list full' warning. Adds block_offload* l10n.

Epic B #166 / B5 #180.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/connector/meshcore_connector.dart

@@ -273,6 +273,7 @@ class MeshCoreConnector extends ChangeNotifier {
   List<String>? _blockDumpKeys;
   int? _blockDumpExpected;
   Timer? _blockListRetryTimer;
+  bool _blockOffloadStoreFull = false;
   String? _firmwareVersion;
   String? _deviceModel;
   int? _offbandCaps;
@@ -549,6 +550,10 @@ class MeshCoreConnector extends ChangeNotifier {
   /// (Offband firmware, capability-gated). Absent → app-local block only.
   bool get supportsOffbandBlock =>
       firmwareSupportsOffbandBlock(_offbandCaps, _firmwareVerCode);
+
+  /// True when the radio's block store hit `MAX_BLOCKED_KEYS` (32) and rejected
+  /// an ADD (ok=0). Local block still applies; those keys just aren't portable.
+  bool get blockOffloadStoreFull => _blockOffloadStoreFull;
   Map<String, String>? get currentCustomVars => _currentCustomVars;
   int? get batteryMillivolts => _batteryMillivolts;
   int? get storageUsedKb => _storageUsedKb;
@@ -4085,7 +4090,14 @@ class MeshCoreConnector extends ChangeNotifier {
   /// → END `[0xC2 0x03 0xFE]`. Normal END and `APP_START` early-END share `0xFE`;
   /// truncation is detected by `count` vs key-frames received.
   void _handleOffbandBlockFrame(Uint8List frame) {
-    if (frame.length < 3 || frame[1] != offbandBlockList) return;
+    if (frame.length < 2) return;
+    if (frame[1] != offbandBlockList) {
+      // ADD/REMOVE/CLEAR reply: [0xC2][sub][ok].
+      final reply = parseOffbandBlockReply(frame);
+      if (reply != null) _handleOffbandBlockReply(reply);
+      return;
+    }
+    if (frame.length < 3) return;
     final marker = frame[2];
     if (marker == 0xFF) {
       _blockDumpKeys = <String>[];
@@ -4140,9 +4152,28 @@ class MeshCoreConnector extends ChangeNotifier {
   /// reconcile runs when the dump completes.
   void _reconcileFirmwareBlock() {
     if (!supportsOffbandBlock) return;
+    if (_blockOffloadStoreFull) {
+      _blockOffloadStoreFull = false;
+      notifyListeners();
+    }
     unawaited(sendFrame(buildOffbandBlockListFrame()));
   }
 
+  /// Handle an ADD/REMOVE/CLEAR reply. ADD ok=0 = node store full
+  /// (`MAX_BLOCKED_KEYS`); local stays authoritative, surface it for the UI.
+  void _handleOffbandBlockReply(OffbandBlockReply reply) {
+    _appDebugLogService?.info(
+      'Offband block reply: sub=${reply.sub} ok=${reply.ok}',
+      tag: 'Block',
+    );
+    if (reply.sub == offbandBlockAdd &&
+        reply.ok == 0 &&
+        !_blockOffloadStoreFull) {
+      _blockOffloadStoreFull = true;
+      notifyListeners();
+    }
+  }
+
   /// Push one local block change to the firmware store (Offband, capability
   /// gated). Wired as `BlockService.firmwareSync`.
   void _pushBlockChange(String keyHex, bool blocked) {

lib/l10n/app_en.arb

@@ -2599,5 +2599,7 @@
   "block_none": "No blocked users",
   "block_keysSection": "Blocked contacts",
   "block_namesSection": "Blocked names",
-  "block_namesHint": "Name-only blocks (channel senders) — each upgrades to a full block once we learn their key."
+  "block_namesHint": "Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.",
+  "block_offloadActive": "Firmware offload active — blocks sync to this radio",
+  "block_offloadStoreFull": "Radio block list full (32) — extra blocks stay app-only"
 }

lib/l10n/app_localizations.dart

@@ -7869,6 +7869,18 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.'**
   String get block_namesHint;
+
+  /// No description provided for @block_offloadActive.
+  ///
+  /// In en, this message translates to:
+  /// **'Firmware offload active — blocks sync to this radio'**
+  String get block_offloadActive;
+
+  /// No description provided for @block_offloadStoreFull.
+  ///
+  /// In en, this message translates to:
+  /// **'Radio block list full (32) — extra blocks stay app-only'**
+  String get block_offloadStoreFull;
 }
 
 class _AppLocalizationsDelegate

lib/l10n/app_localizations_bg.dart

@@ -4607,4 +4607,12 @@ class AppLocalizationsBg extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_de.dart

@@ -4625,4 +4625,12 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_en.dart

@@ -4529,4 +4529,12 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_es.dart

@@ -4612,4 +4612,12 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_fr.dart

@@ -4641,4 +4641,12 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_hu.dart

@@ -4628,4 +4628,12 @@ class AppLocalizationsHu extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_it.dart

@@ -4617,4 +4617,12 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_ja.dart

@@ -4382,4 +4382,12 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_ko.dart

@@ -4383,4 +4383,12 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_nl.dart

@@ -4592,4 +4592,12 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_pl.dart

@@ -4629,4 +4629,12 @@ class AppLocalizationsPl extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_pt.dart

@@ -4605,4 +4605,12 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_ru.dart

@@ -4623,4 +4623,12 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_sk.dart

@@ -4588,4 +4588,12 @@ class AppLocalizationsSk extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_sl.dart

@@ -4586,4 +4586,12 @@ class AppLocalizationsSl extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_sv.dart

@@ -4561,4 +4561,12 @@ class AppLocalizationsSv extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_uk.dart

@@ -4624,4 +4624,12 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/l10n/app_localizations_zh.dart

@@ -4256,4 +4256,12 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get block_namesHint =>
       'Name-only blocks (channel senders) — each upgrades to a full block once we learn their key.';
+
+  @override
+  String get block_offloadActive =>
+      'Firmware offload active — blocks sync to this radio';
+
+  @override
+  String get block_offloadStoreFull =>
+      'Radio block list full (32) — extra blocks stay app-only';
 }

lib/screens/settings/blocked_view.dart

@@ -19,12 +19,23 @@ class BlockedView extends StatelessWidget {
       builder: (context, block, connector, child) {
         final keys = block.blockedKeys.toList()..sort();
         final names = block.blockedNames.keys.toList()..sort();
+        final indicator = _offloadIndicator(context, connector);
         if (keys.isEmpty && names.isEmpty) {
-          return Center(child: Text(context.l10n.block_none));
+          return ListView(
+            padding: const EdgeInsets.all(16),
+            children: [
+              ?indicator,
+              Padding(
+                padding: const EdgeInsets.symmetric(vertical: 48),
+                child: Center(child: Text(context.l10n.block_none)),
+              ),
+            ],
+          );
         }
         return ListView(
           padding: const EdgeInsets.all(16),
           children: [
+            ?indicator,
             if (keys.isNotEmpty) ...[
               _sectionHeader(context.l10n.block_keysSection),
               ...keys.map((k) => _keyTile(context, block, connector, k)),
@@ -47,6 +58,27 @@ class BlockedView extends StatelessWidget {
     );
   }
 
+  /// Firmware-offload status row (only when the radio supports block offload):
+  /// "active" normally, or a "store full" warning when the node hit its cap.
+  Widget? _offloadIndicator(BuildContext context, MeshCoreConnector connector) {
+    if (!connector.supportsOffbandBlock) return null;
+    final full = connector.blockOffloadStoreFull;
+    return Card(
+      child: ListTile(
+        dense: true,
+        leading: Icon(
+          full ? Icons.warning_amber : Icons.sync,
+          color: full ? Colors.amber.shade800 : Colors.green,
+        ),
+        title: Text(
+          full
+              ? context.l10n.block_offloadStoreFull
+              : context.l10n.block_offloadActive,
+        ),
+      ),
+    );
+  }
+
   Widget _sectionHeader(String text) => Padding(
     padding: const EdgeInsets.fromLTRB(8, 8, 8, 8),
     child: Text(

untranslated.json

@@ -46,7 +46,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "de": [
@@ -96,7 +98,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "es": [
@@ -146,7 +150,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "fr": [
@@ -196,7 +202,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "hu": [
@@ -246,7 +254,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "it": [
@@ -296,7 +306,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "ja": [
@@ -346,7 +358,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "ko": [
@@ -396,7 +410,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "nl": [
@@ -446,7 +462,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "pl": [
@@ -496,7 +514,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "pt": [
@@ -546,7 +566,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "ru": [
@@ -596,7 +618,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "sk": [
@@ -646,7 +670,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "sl": [
@@ -696,7 +722,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "sv": [
@@ -746,7 +774,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "uk": [
@@ -796,7 +826,9 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ],
 
   "zh": [
@@ -846,6 +878,8 @@
     "block_none",
     "block_keysSection",
     "block_namesSection",
-    "block_namesHint"
+    "block_namesHint",
+    "block_offloadActive",
+    "block_offloadStoreFull"
   ]
 }