fix: Show recipient activity previews

lib/services/region_discovery_service.dart

@@ -1,72 +0,0 @@
-import 'dart:async';
-import 'dart:convert';
-import 'package:flutter/foundation.dart';
-import '../providers/connection_provider.dart';
-
-/// Discovers available regions from repeater contacts via anonymous requests.
-///
-/// The firmware repeater responds to ANON_REQ_TYPE_REGIONS (0x01) with a
-/// comma-separated list of region names that have flood allowed.
-class RegionDiscoveryService {
-  static const int _anonReqTypeRegions = 0x01;
-
-  /// Discover regions from a single repeater.
-  ///
-  /// Sends an anonymous request to the repeater and waits for the response.
-  /// Returns a list of region names (with `#` prefix).
-  /// Returns empty list on timeout or error.
-  static Future<List<String>> discoverFromRepeater({
-    required Uint8List repeaterPublicKey,
-    required ConnectionProvider connectionProvider,
-    Duration timeout = const Duration(seconds: 10),
-  }) async {
-    final result = await connectionProvider.sendAnonRequest(
-      contactPublicKey: repeaterPublicKey,
-      requestData: Uint8List.fromList([_anonReqTypeRegions]),
-    );
-    if (result == null) return [];
-
-    final tag = result.tag;
-    final completer = Completer<List<String>>();
-
-    void onResponse(Uint8List publicKeyPrefix, int responseTag, Uint8List data) {
-      if (responseTag != tag || completer.isCompleted) return;
-      completer.complete(_parseRegionResponse(data));
-    }
-
-    connectionProvider.onBinaryResponse = onResponse;
-
-    try {
-      return await completer.future.timeout(
-        timeout,
-        onTimeout: () => <String>[],
-      );
-    } catch (e) {
-      debugPrint('⚠️ [RegionDiscovery] Error discovering regions: $e');
-      return [];
-    } finally {
-      // Restore previous handler — callers should re-set if needed
-      if (connectionProvider.onBinaryResponse == onResponse) {
-        connectionProvider.onBinaryResponse = null;
-      }
-    }
-  }
-
-  /// Parse the region response payload.
-  ///
-  /// Format: [4B sender_timestamp][4B repeater_clock][comma-separated names]
-  /// Names are returned without `#` prefix from firmware; we add it back.
-  static List<String> _parseRegionResponse(Uint8List data) {
-    if (data.length <= 8) return [];
-
-    final namesStr = utf8.decode(data.sublist(8), allowMalformed: true).trim();
-    if (namesStr.isEmpty || namesStr == '-none-') return [];
-
-    return namesStr
-        .split(',')
-        .map((name) => name.trim())
-        .where((name) => name.isNotEmpty && name != '*' && !name.startsWith('\$'))
-        .map((name) => name.startsWith('#') ? name : '#$name')
-        .toList();
-  }
-}