fix: range error on chat drawer

lib/core/providers/app_providers.dart

@@ -442,8 +442,11 @@ final conversationsProvider = FutureProvider<List<Conversation>>((ref) async {
           conversationMap[conversation.id] = conversation.copyWith(
             folderId: folderIdToUse,
           );
+          final _idPreview = conversation.id.length > 8
+              ? conversation.id.substring(0, 8)
+              : conversation.id;
           foundation.debugPrint(
-            'DEBUG: Updated conversation ${conversation.id.substring(0, 8)} with folderId: $folderIdToUse (explicit: ${explicitFolderId != null})',
+            'DEBUG: Updated conversation $_idPreview with folderId: $folderIdToUse (explicit: ${explicitFolderId != null})',
           );
         } else {
           conversationMap[conversation.id] = conversation;
@@ -505,8 +508,11 @@ final conversationsProvider = FutureProvider<List<Conversation>>((ref) async {
             // Use map to prevent duplicates - this will overwrite if ID already exists
             conversationMap[toAdd.id] = toAdd;
             existingIds.add(toAdd.id);
+            final _idPreview = toAdd.id.length > 8
+                ? toAdd.id.substring(0, 8)
+                : toAdd.id;
             foundation.debugPrint(
-              'DEBUG: Added missing conversation from folder fetch: ${toAdd.id.substring(0, 8)} -> folder ${folder.id}',
+              'DEBUG: Added missing conversation from folder fetch: $_idPreview -> folder ${folder.id}',
             );
           } else {
             // Create a minimal placeholder if not returned by folder API
@@ -521,8 +527,11 @@ final conversationsProvider = FutureProvider<List<Conversation>>((ref) async {
             // Use map to prevent duplicates
             conversationMap[convId] = placeholder;
             existingIds.add(convId);
+            final _idPreview = convId.length > 8
+                ? convId.substring(0, 8)
+                : convId;
             foundation.debugPrint(
-              'DEBUG: Added placeholder conversation for missing ID: ${convId.substring(0, 8)} -> folder ${folder.id}',
+              'DEBUG: Added placeholder conversation for missing ID: $_idPreview -> folder ${folder.id}',
             );
           }
         }

lib/core/services/api_service.dart

@@ -417,9 +417,11 @@ class ApiService {
           debugPrint(
             '🔍 DEBUG: Sample chat data fields: ${chatData.keys.toList()}',
           );
-          debugPrint(
-            '🔍 DEBUG: Sample chat data: ${chatData.toString().substring(0, 200)}...',
-          );
+          final _sampleStr = chatData.toString();
+          final _preview = _sampleStr.length > 200
+              ? _sampleStr.substring(0, 200)
+              : _sampleStr;
+          debugPrint('🔍 DEBUG: Sample chat data: $_preview...');
         }
 
         final conversation = _parseOpenWebUIChat(chatData);
@@ -498,9 +500,8 @@ class ApiService {
 
     // Debug logging for folder assignment
     if (folderId != null) {
-      debugPrint(
-        '🔍 DEBUG: Conversation ${id.substring(0, 8)} has folderId: $folderId',
-      );
+      final _idPreview = id.length > 8 ? id.substring(0, 8) : id;
+      debugPrint('🔍 DEBUG: Conversation $_idPreview has folderId: $folderId');
     }
 
     debugPrint(
@@ -3020,9 +3021,11 @@ class ApiService {
         } else if (response.data is Map) {
           DebugLogger.log('   Object keys: ${(response.data as Map).keys}');
         }
-        DebugLogger.log(
-          '   Sample data: ${response.data.toString().substring(0, 200)}...',
-        );
+        final _dataStr = response.data.toString();
+        final _dataPreview = _dataStr.length > 200
+            ? _dataStr.substring(0, 200)
+            : _dataStr;
+        DebugLogger.log('   Sample data: $_dataPreview...');
       } catch (e) {
         debugPrint('❌ $endpoint - Error: $e');
       }

lib/features/navigation/widgets/chats_drawer.dart

@@ -198,23 +198,32 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
 
           // Build sections
           final pinned = list.where((c) => c.pinned == true).toList();
-          final regular = list
-              .where(
-                (c) =>
-                    c.pinned != true &&
-                    c.archived != true &&
-                    (c.folderId == null || c.folderId!.isEmpty),
-              )
-              .toList();
-          final foldered = list
-              .where(
-                (c) =>
-                    c.pinned != true &&
-                    c.archived != true &&
-                    c.folderId != null &&
-                    c.folderId!.isNotEmpty,
-              )
-              .toList();
+
+          // Determine which folder IDs actually exist from the API
+          final foldersState = ref.watch(foldersProvider);
+          final availableFolderIds = foldersState.maybeWhen(
+            data: (folders) => folders.map((f) => f.id).toSet(),
+            orElse: () => <String>{},
+          );
+
+          // Conversations that reference a non-existent/unknown folder should not disappear.
+          // Treat those as regular until the folders list is available and contains the ID.
+          final regular = list.where((c) {
+            final hasFolder = (c.folderId != null && c.folderId!.isNotEmpty);
+            final folderKnown = hasFolder && availableFolderIds.contains(c.folderId);
+            return c.pinned != true &&
+                c.archived != true &&
+                (!hasFolder || !folderKnown);
+          }).toList();
+
+          final foldered = list.where((c) {
+            final hasFolder = (c.folderId != null && c.folderId!.isNotEmpty);
+            return c.pinned != true &&
+                c.archived != true &&
+                hasFolder &&
+                availableFolderIds.contains(c.folderId);
+          }).toList();
+
           final archived = list.where((c) => c.archived == true).toList();
 
           return Scrollbar(
@@ -342,23 +351,30 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
         }
 
         final pinned = list.where((c) => c.pinned == true).toList();
-        final regular = list
-            .where(
-              (c) =>
-                  c.pinned != true &&
-                  c.archived != true &&
-                  (c.folderId == null || c.folderId!.isEmpty),
-            )
-            .toList();
-        final foldered = list
-            .where(
-              (c) =>
-                  c.pinned != true &&
-                  c.archived != true &&
-                  c.folderId != null &&
-                  c.folderId!.isNotEmpty,
-            )
-            .toList();
+
+        // For search results, apply the same folder safety logic
+        final foldersState = ref.watch(foldersProvider);
+        final availableFolderIds = foldersState.maybeWhen(
+          data: (folders) => folders.map((f) => f.id).toSet(),
+          orElse: () => <String>{},
+        );
+
+        final regular = list.where((c) {
+          final hasFolder = (c.folderId != null && c.folderId!.isNotEmpty);
+          final folderKnown = hasFolder && availableFolderIds.contains(c.folderId);
+          return c.pinned != true &&
+              c.archived != true &&
+              (!hasFolder || !folderKnown);
+        }).toList();
+
+        final foldered = list.where((c) {
+          final hasFolder = (c.folderId != null && c.folderId!.isNotEmpty);
+          return c.pinned != true &&
+              c.archived != true &&
+              hasFolder &&
+              availableFolderIds.contains(c.folderId);
+        }).toList();
+
         final archived = list.where((c) => c.archived == true).toList();
 
         return Scrollbar(