fix: conversation search

lib/core/services/api_service.dart

@@ -3229,7 +3229,12 @@ class ApiService {
     return <Conversation>[];
   }
 
-  /// Search within messages content
+  /// Search within messages content (capability-safe)
+  ///
+  /// Many OpenWebUI versions do not expose a dedicated messages search endpoint.
+  /// We attempt a GET to `/api/v1/chats/messages/search` and gracefully return
+  /// an empty list when the endpoint is missing or method is not allowed
+  /// (404/405), avoiding noisy errors.
   Future<List<Map<String, dynamic>>> searchMessages({
     required String query,
     String? chatId,
@@ -3241,9 +3246,10 @@ class ApiService {
     int? offset,
   }) async {
     debugPrint('DEBUG: Searching messages with query: $query');
-    final response = await _dio.post(
+
-      '/api/v1/chats/messages/search',
+    // Build query parameters; include both 'text' and 'query' for compatibility
-      data: {
+    final qp = <String, dynamic>{
+      'text': query,
       'query': query,
       if (chatId != null) 'chat_id': chatId,
       if (userId != null) 'user_id': userId,
@@ -3252,13 +3258,40 @@ class ApiService {
       if (toDate != null) 'to_date': toDate.toIso8601String(),
       if (limit != null) 'limit': limit,
       if (offset != null) 'offset': offset,
-      },
+    };
+
+    try {
+      final response = await _dio.get(
+        '/api/v1/chats/messages/search',
+        queryParameters: qp,
+        // Accept 404/405 to avoid throwing when endpoint is unsupported
+        options: Options(
+          validateStatus: (code) => code != null && (code < 400 || code == 404 || code == 405),
+        ),
       );
+
+      // If not supported, quietly return empty results
+      if (response.statusCode == 404 || response.statusCode == 405) {
+        debugPrint('DEBUG: messages search endpoint not supported (status: ${response.statusCode})');
+        return [];
+      }
+
       final data = response.data;
       if (data is List) {
-      return data.cast<Map<String, dynamic>>();
+        return data.whereType<Map<String, dynamic>>().toList();
+      }
+      if (data is Map<String, dynamic>) {
+        final list = (data['items'] ?? data['results'] ?? data['messages']);
+        if (list is List) {
+          return list.whereType<Map<String, dynamic>>().toList();
+        }
       }
       return [];
+    } on DioException catch (e) {
+      // On any transport or other error, degrade gracefully without surfacing
+      debugPrint('DEBUG: messages search request failed gracefully: ${e.type}');
+      return [];
+    }
   }
 
   /// Get chat statistics and analytics