feat(zns): Zcash Name System integration

lib/src/core/profile_pictures.dart

@@ -60,11 +60,19 @@ const kProfilePictureOptions = <ProfilePictureOption>[
   ),
 ];
 
+const _kZnsPrefix = 'zns-';
+
+bool isZnsProfilePictureId(String id) => id.startsWith(_kZnsPrefix);
+
+String _stripZnsPrefix(String id) =>
+    id.startsWith(_kZnsPrefix) ? id.substring(_kZnsPrefix.length) : id;
+
 ProfilePictureOption? findProfilePictureOption(String id) {
+  final baseId = _stripZnsPrefix(id);
   for (final option in kProfilePictureOptions) {
-    if (option.id == id) return option;
+    if (option.id == baseId) return option;
   }
-  if (_legacyKnightIdPattern.hasMatch(id)) {
+  if (_legacyKnightIdPattern.hasMatch(baseId)) {
     return kProfilePictureOptions.first;
   }
   return null;

lib/src/core/widgets/app_profile_picture.dart

@@ -27,13 +27,14 @@ class AppProfilePicture extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final option = resolveProfilePictureOption(profilePictureId);
+    final isZns = isZnsProfilePictureId(profilePictureId);
 
     return Container(
       width: size.dimension,
       height: size.dimension,
       clipBehavior: Clip.antiAlias,
       decoration: BoxDecoration(
-        color: context.colors.background.raised,
+        color: isZns ? const Color(0xFFD4A843) : context.colors.background.raised,
         borderRadius: BorderRadius.circular(size.radius),
       ),
       child: Image.asset(

lib/src/features/accounts/screens/accounts_screen.dart

@@ -21,6 +21,7 @@ import '../../../providers/account_provider.dart';
 import '../../../providers/app_security_provider.dart';
 import '../../../providers/sync_provider.dart';
 import '../../../providers/wallet_mutation_guard.dart';
+import '../../../providers/zns_provider.dart';
 import '../widgets/account_name_modal.dart';
 import '../widgets/account_profile_picture_modal.dart';
 import '../widgets/account_remove_modal.dart';
@@ -71,6 +72,19 @@ class _AccountsScreenState extends ConsumerState<AccountsScreen> {
     await ref.read(accountProvider.notifier).renameAccount(uuid, name);
     if (!mounted) return;
     _closeModal();
+    unawaited(_checkZnsEasterEgg(uuid, name));
+  }
+
+  Future<void> _checkZnsEasterEgg(String uuid, String name) async {
+    final owned = await ref.read(znsResolverProvider).isOwnedByAccount(name, uuid);
+    if (!mounted || !owned) return;
+    final account = ref.read(accountProvider).value?.accounts
+        .where((a) => a.uuid == uuid)
+        .firstOrNull;
+    if (account == null) return;
+    final currentId = account.profilePictureId;
+    if (currentId.startsWith('zns-')) return;
+    await ref.read(accountProvider.notifier).updateProfilePicture(uuid, 'zns-$currentId');
   }
 
   Future<void> _updateProfilePicture(

lib/src/features/activity/screens/activity_transaction_status_screen.dart

@@ -19,6 +19,7 @@ import '../../../providers/account_provider.dart';
 import '../../../providers/privacy_mode_provider.dart';
 import '../../../providers/rpc_endpoint_provider.dart';
 import '../../../providers/sync_provider.dart';
+import '../../../providers/zns_provider.dart';
 import '../../../rust/api/sync.dart' as rust_sync;
 import '../../send/widgets/transaction_receipt_view.dart';
 
@@ -54,6 +55,8 @@ class _ActivityTransactionStatusScreenState
   String? _error;
   String? _activeAccountUuid;
   bool _messageExpanded = false;
+  String? _znsName;
+  int _znsSeq = 0;
 
   @override
   void initState() {
@@ -65,6 +68,7 @@ class _ActivityTransactionStatusScreenState
       if (!mounted) return;
       ref.read(appLayoutProvider.notifier).setMode(AppLayoutMode.large);
       unawaited(_loadTransaction(showLoading: _transaction == null));
+      _triggerZnsLookup(widget.args.initialDetail?.primaryAddress);
     });
   }
 
@@ -140,6 +144,7 @@ class _ActivityTransactionStatusScreenState
         }
         _isLoading = false;
       });
+      if (tx != null) _triggerZnsLookup(detail?.primaryAddress);
     } catch (e, st) {
       log('ActivityTransactionStatus: transaction load failed: $e\n$st');
       if (!mounted) return;
@@ -215,6 +220,23 @@ class _ActivityTransactionStatusScreenState
         (expected == 'received' && actual == 'receiving');
   }
 
+  void _triggerZnsLookup(String? address) {
+    if (address == null || address.isEmpty) return;
+    final seq = ++_znsSeq;
+    setState(() => _znsName = null);
+    unawaited(_resolveZnsName(address, seq));
+  }
+
+  Future<void> _resolveZnsName(String address, int seq) async {
+    try {
+      final name = await ref.read(znsResolverProvider).reverseResolve(address);
+      if (!mounted || seq != _znsSeq) return;
+      setState(() => _znsName = name);
+    } catch (e) {
+      log('ActivityTransactionStatus: ZNS reverse lookup failed: $e');
+    }
+  }
+
   Future<void> _copyTransactionHash() async {
     await _copyText(widget.args.txidHex, 'Transaction Hash Copied');
   }
@@ -352,6 +374,7 @@ class _ActivityTransactionStatusScreenState
     BuildContext context, {
     required String title,
     required String address,
+    String? znsName,
     bool useFailedReceiptLayout = false,
     bool compactAddress = false,
   }) {
@@ -360,13 +383,27 @@ class _ActivityTransactionStatusScreenState
     return TransactionReceiptBlockData(
       title: title,
       onCopy: () => unawaited(_copyText(trimmedAddress, 'Address Copied')),
-      child: TransactionReceiptAddressText(
-        address: trimmedAddress,
-        highlightEdges: _shouldHighlightAddressEdges(trimmedAddress),
-        compact: compactAddress,
-        highlightColor: useFailedReceiptLayout
-            ? colors.text.destructive
-            : colors.text.success,
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          if (znsName != null) ...[
+            Text(
+              znsName,
+              style: AppTypography.labelMedium.copyWith(
+                color: colors.text.secondary,
+              ),
+            ),
+            const SizedBox(height: AppSpacing.xxs),
+          ],
+          TransactionReceiptAddressText(
+            address: trimmedAddress,
+            highlightEdges: _shouldHighlightAddressEdges(trimmedAddress),
+            compact: compactAddress,
+            highlightColor: useFailedReceiptLayout
+                ? colors.text.destructive
+                : colors.text.success,
+          ),
+        ],
       ),
     );
   }
@@ -390,6 +427,7 @@ class _ActivityTransactionStatusScreenState
         context,
         title: 'To',
         address: primaryAddress,
+        znsName: _znsName,
         useFailedReceiptLayout: useFailedReceiptLayout,
         compactAddress: compactAddress,
       );

lib/src/features/send/screens/send_review_screen.dart

@@ -37,6 +37,7 @@ class SendReviewArgs {
     required this.feeZatoshi,
     required this.needsSaplingParams,
     this.memo,
+    this.resolvedName,
   });
 
   final BigInt proposalId;
@@ -48,8 +49,10 @@ class SendReviewArgs {
   final BigInt feeZatoshi;
   final bool needsSaplingParams;
   final String? memo;
+  final String? resolvedName;
 
   bool get isShielded => addressType == 'unified' || addressType == 'sapling';
+  String get recipientLabel => resolvedName != null ? 'To: $resolvedName' : 'To';
 }
 
 class KeystoneBroadcastArgs {
@@ -578,7 +581,7 @@ class _SendReviewReceiptCard extends StatelessWidget {
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
                 _SendReviewFieldTitle(
-                  label: 'To',
+                  label: args.recipientLabel,
                   rightLabel: _SendReviewCopyAction(onTap: onCopyAddress),
                 ),
                 const SizedBox(height: AppSpacing.xs),