Use new list/sheets api instead of paged one

lib/api.dart

@@ -121,15 +121,9 @@ class ApiClient {
     return null;
   }
 
-  Future<List<Sheet>> fetchSheets({String sortBy = "last_opened desc"}) async {
+  Future<List<Sheet>> fetchSheets() async {
     try {
-      final bodyFormData = {
-        "page": 1,
-        "limit": "1000",
-        "sort_by": sortBy,
-      };
-
-      final response = await postFormData("/sheets", jsonEncode(bodyFormData));
+      final response = await get("/list/sheets");
 
       if (response == null) {
         return List.empty();
@@ -138,7 +132,7 @@ class ApiClient {
       if (response.statusCode == 200) {
         final data = jsonDecode(response.body);
         log("Data: $data");
-        return (data['rows'] as List<dynamic>)
+        return (data as List<dynamic>)
             .map((sheet) => Sheet.fromJson(sheet as Map<String, dynamic>))
             .toList();
       } else {