[Settings] Search Results Page Improvements (#41719)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

- Fix tab navigation issues #41717
- Minor improvement:
  - Show module group only if there are modules to show #41526
  - Add line break in the "no results" message

0.94
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PR
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## PR Checklist

- [x] Closes: #41717 #41526
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

- Verified that tab navigation is smooth between search groups
- Verified that narrator announces group names
- Tested empty search results page

src/settings-ui/Settings.UI/SettingsXAML/Views/SearchResultsPage.xaml

@@ -8,6 +8,7 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:models="using:Settings.UI.Library"
     xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
+    xmlns:tkconverters="using:CommunityToolkit.WinUI.Converters"
     xmlns:ui="using:CommunityToolkit.WinUI"
     xmlns:vm="using:Microsoft.PowerToys.Settings.UI.ViewModels"
     x:Name="RootPage"
@@ -16,13 +17,20 @@
 
     <Page.Resources>
         <converters:IconConverter x:Key="IconConverter" />
+        <tkconverters:CollectionVisibilityConverter x:Key="CollectionVisibilityConverter" />
     </Page.Resources>
 
     <controls:SettingsPageControl x:Name="PageControl" x:Uid="SearchResults_Title">
         <controls:SettingsPageControl.ModuleContent>
             <StackPanel Margin="0,-40,0,0" Orientation="Vertical">
-                <controls:SettingsGroup x:Uid="SearchResults_ModulesTitle" Margin="0,-10,0,0">
-                    <ItemsControl x:Name="ModulesItemsControl" ItemsSource="{x:Bind ViewModel.ModuleResults, Mode=OneWay}">
+                <controls:SettingsGroup
+                    x:Uid="SearchResults_ModulesTitle"
+                    Margin="0,-10,0,0"
+                    Visibility="{x:Bind ViewModel.ModuleResults, Mode=OneWay, Converter={StaticResource CollectionVisibilityConverter}}">
+                    <ItemsControl
+                        x:Name="ModulesItemsControl"
+                        IsTabStop="False"
+                        ItemsSource="{x:Bind ViewModel.ModuleResults, Mode=OneWay}">
                         <ItemsControl.ItemTemplate>
                             <DataTemplate x:DataType="models:SettingEntry">
                                 <tkcontrols:SettingsCard
@@ -37,11 +45,14 @@
                 </controls:SettingsGroup>
 
                 <!--  Settings Groups  -->
-                <ItemsControl x:Name="SettingsGroupsItemsControl" ItemsSource="{x:Bind ViewModel.GroupedSettingsResults, Mode=OneWay}">
+                <ItemsControl
+                    x:Name="SettingsGroupsItemsControl"
+                    IsTabStop="False"
+                    ItemsSource="{x:Bind ViewModel.GroupedSettingsResults, Mode=OneWay}">
                     <ItemsControl.ItemTemplate>
                         <DataTemplate x:DataType="vm:SettingsGroup">
                             <controls:SettingsGroup Header="{x:Bind GroupName}">
-                                <ItemsControl ItemsSource="{x:Bind Settings}">
+                                <ItemsControl IsTabStop="False" ItemsSource="{x:Bind Settings}">
                                     <ItemsControl.ItemTemplate>
                                         <DataTemplate x:DataType="models:SettingEntry">
                                             <tkcontrols:SettingsCard
@@ -72,6 +83,7 @@
                         Glyph="&#xE71C;" />
                     <TextBlock HorizontalAlignment="Center" TextAlignment="Center">
                         <Run x:Uid="SearchResults_NoResultsHeader" FontWeight="SemiBold" />
+                        <LineBreak />
                         <Run x:Uid="SearchResults_NoResultsDescription" Foreground="{ThemeResource TextFillColorSecondaryBrush}" />
                     </TextBlock>
                 </StackPanel>