fix: the default page name should be empty when creating (#7389)

Author: LucasXu0

frontend/appflowy_flutter/lib/mobile/presentation/base/mobile_view_page.dart

@@ -293,6 +293,9 @@ class _MobileViewPageState extends State<MobileViewPage> {
           );
         }
 
+        final name =
+            widget.fixedTitle ?? view?.nameOrDefault ?? widget.title ?? '';
+
         return Opacity(
           opacity: value,
           child: Row(
@@ -305,7 +308,7 @@ class _MobileViewPageState extends State<MobileViewPage> {
                 const HSpace(4),
               ],
               FlowyText.medium(
-                widget.fixedTitle ?? view?.name ?? widget.title ?? '',
+                name,
                 fontSize: 15.0,
                 overflow: TextOverflow.ellipsis,
                 figmaLineHeight: 18.0,

frontend/appflowy_flutter/lib/mobile/presentation/home/space/mobile_space.dart

@@ -98,7 +98,7 @@ class MobileSpace extends StatelessWidget {
             Navigator.of(sheetContext).pop();
             context.read<SpaceBloc>().add(
                   SpaceEvent.createPage(
-                    name: layout.defaultName,
+                    name: '',
                     layout: layout,
                     index: 0,
                     openAfterCreate: true,

frontend/appflowy_flutter/lib/mobile/presentation/home/tab/mobile_space_tab.dart

@@ -11,7 +11,6 @@ import 'package:appflowy/workspace/application/menu/sidebar_sections_bloc.dart';
 import 'package:appflowy/workspace/application/sidebar/folder/folder_bloc.dart';
 import 'package:appflowy/workspace/application/sidebar/space/space_bloc.dart';
 import 'package:appflowy/workspace/application/user/user_workspace_bloc.dart';
-import 'package:appflowy/workspace/application/view/view_ext.dart';
 import 'package:appflowy_backend/log.dart';
 import 'package:appflowy_backend/protobuf/flowy-folder/view.pb.dart';
 import 'package:appflowy_backend/protobuf/flowy-user/protobuf.dart';
@@ -193,7 +192,7 @@ class _MobileSpaceTabState extends State<MobileSpaceTab>
     if (context.read<SpaceBloc>().state.spaces.isNotEmpty) {
       context.read<SpaceBloc>().add(
             SpaceEvent.createPage(
-              name: layout.defaultName,
+              name: '',
               layout: layout,
               openAfterCreate: true,
             ),
@@ -202,7 +201,7 @@ class _MobileSpaceTabState extends State<MobileSpaceTab>
       // only support create document in section
       context.read<SidebarSectionsBloc>().add(
             SidebarSectionsEvent.createRootViewInSection(
-              name: layout.defaultName,
+              name: '',
               index: 0,
               viewSection: FolderSpaceType.public.toViewSectionPB,
             ),