refactor(ui): normalize buttons/footer/padding in RepoImportModal

src/ClaudeDo.Ui/Views/Modals/RepoImportModalView.axaml

@@ -17,8 +17,8 @@
   <ctl:ModalShell Title="ADD REPOS AS LISTS" CloseCommand="{Binding CancelCommand}">
     <ctl:ModalShell.Footer>
       <StackPanel Orientation="Horizontal" Spacing="8" HorizontalAlignment="Right"
-                  VerticalAlignment="Center" Margin="16,0">
-        <Button Content="Cancel" Command="{Binding CancelCommand}" MinWidth="90"/>
+                  VerticalAlignment="Center">
+        <Button Classes="btn" Content="Cancel" Command="{Binding CancelCommand}" MinWidth="90"/>
         <Button Content="{Binding CreateButtonText}" Command="{Binding CreateCommand}"
                 IsEnabled="{Binding CanCreate}" MinWidth="120" Classes="primary"/>
       </StackPanel>
@@ -27,19 +27,19 @@
     <!-- Body: toolbar + checklist -->
     <DockPanel>
       <!-- Toolbar: search + folder actions -->
-      <StackPanel DockPanel.Dock="Top" Spacing="8" Margin="16,12,16,6">
+      <StackPanel DockPanel.Dock="Top" Spacing="8" Margin="20,12,20,6">
         <TextBox Text="{Binding SearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                  PlaceholderText="Search repos…"/>
         <Grid ColumnDefinitions="Auto,*,Auto">
-          <Button Grid.Column="0" Content="Add folder…" Click="AddFolderClicked"/>
-          <Button Grid.Column="2" Content="Forget folders"
+          <Button Classes="btn" Grid.Column="0" Content="Add folder…" Click="AddFolderClicked"/>
+          <Button Classes="btn" Grid.Column="2" Content="Forget folders"
                   Command="{Binding ForgetFoldersCommand}"
                   IsVisible="{Binding HasFolders}"/>
         </Grid>
       </StackPanel>
 
       <!-- Repo checklist -->
-      <ScrollViewer Padding="16,2,16,8">
+      <ScrollViewer Padding="20,2,20,8">
         <ItemsControl ItemsSource="{Binding Repos}">
           <ItemsControl.ItemTemplate>
             <DataTemplate DataType="vm:RepoImportItemViewModel">