Revert "Get rid of additional progress bar loading in list page under the command bar."

This reverts commit cfdd32708a.

Wino.Mail/Views/MailListPage.xaml

@@ -403,10 +403,7 @@
 
     <Grid x:Name="RootGrid">
         <Grid.ColumnDefinitions>
-            <ColumnDefinition
-                x:Name="ReaderColumn"
-                Width="*"
-                MaxWidth="{x:Bind ViewModel.StatePersistanceService.MailListPaneLength, Mode=OneWay}" />
+            <ColumnDefinition x:Name="ReaderColumn" Width="*" MaxWidth="{x:Bind ViewModel.StatePersistanceService.MailListPaneLength, Mode=OneWay}"/>
             <ColumnDefinition x:Name="RendererColumn" Width="*" />
         </Grid.ColumnDefinitions>
 
@@ -437,10 +434,16 @@
                 <!--  Top Commands  -->
                 <Grid
                     Grid.Row="0"
-                    Padding="4"
+                    Padding="2,0"
                     Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
                     CornerRadius="8">
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="48" />
+                        <RowDefinition Height="2" />
+                    </Grid.RowDefinitions>
+
                     <!--  Commands  -->
+                    <Grid>
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="*" />
                             <ColumnDefinition Width="*" />
@@ -580,6 +583,13 @@
                         </Button>
                     </Grid>
 
+                    <muxc:ProgressBar
+                        x:Name="LoadingProgressBar"
+                        Grid.Row="1"
+                        IsIndeterminate="True"
+                        x:Load="{x:Bind ViewModel.IsInitializingFolder, Mode=OneWay}" />
+                </Grid>
+
                 <!--  Pivot + Sync + Multi Select  -->
                 <Grid
                     Grid.Row="1"