feat(social): local blocklist — hide blocked authors' offers, chats and incoming messages, with unblock management

apps/app_seeds/lib/ui/chat_screen.dart

@@ -16,6 +16,7 @@ import '../services/profile_cache.dart';
 import '../services/profile_store.dart';
 import '../services/social_connection.dart';
 import '../services/social_service.dart';
+import '../services/social_settings.dart';
 import '../services/unread_service.dart';
 import '../state/messages_cubit.dart';
 import '../state/peer_rating_cubit.dart';
@@ -36,6 +37,7 @@ class ChatScreen extends StatefulWidget {
     this.messageStore,
     this.profileCache,
     this.onboarding,
+    this.settings,
     super.key,
   });
 
@@ -57,6 +59,11 @@ class ChatScreen extends StatefulWidget {
   /// entering the market). Null in tests → no gate.
   final OnboardingStore? onboarding;
 
+  /// Social settings holding the local blocklist; falls back to the app-wide
+  /// instance so the block action also works when not injected. Null in
+  /// tests → the block menu is hidden.
+  final SocialSettings? settings;
+
   @override
   State<ChatScreen> createState() => _ChatScreenState();
 }
@@ -191,6 +198,42 @@ class _ChatScreenState extends State<ChatScreen> {
     }
   }
 
+  SocialSettings? get _settings =>
+      widget.settings ??
+      (getIt.isRegistered<SocialSettings>() ? getIt<SocialSettings>() : null);
+
+  /// Blocks this peer after confirmation and leaves the chat; their offers,
+  /// conversation and future messages disappear (all locally).
+  Future<void> _blockPeer() async {
+    final settings = _settings;
+    if (settings == null) return;
+    final t = context.t;
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Text(t.block.confirmTitle),
+        content: Text(t.block.confirmBody),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(false),
+            child: Text(t.common.cancel),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.of(context).pop(true),
+            child: Text(t.block.confirm),
+          ),
+        ],
+      ),
+    );
+    if (confirmed != true || !mounted) return;
+    await settings.block(widget.peerPubkey);
+    if (!mounted) return;
+    ScaffoldMessenger.of(context)
+      ..hideCurrentSnackBar()
+      ..showSnackBar(SnackBar(content: Text(t.block.blockedToast)));
+    Navigator.of(context).pop();
+  }
+
   Future<void> _send() async {
     final cubit = _messages;
     if (cubit == null || _input.text.trim().isEmpty) return;
@@ -244,6 +287,19 @@ class _ChatScreenState extends State<ChatScreen> {
               tooltip: t.chat.payG1,
               onPressed: _payG1,
             ),
+          if (_settings != null)
+            PopupMenuButton<String>(
+              key: const Key('chat.menu'),
+              onSelected: (value) {
+                if (value == 'block') _blockPeer();
+              },
+              itemBuilder: (context) => [
+                PopupMenuItem(
+                  value: 'block',
+                  child: Text(t.block.action),
+                ),
+              ],
+            ),
         ],
       ),
       body: _loading || messages == null || trust == null || rating == null