[Settings] String updates and minor UX tweaks (#40249)

## Summary of the Pull Request

- I asked Copilot nicely to rewrite some of our strings to be inline
with the Windows writing style guide and to be less verbose or provide a
better explaination.
- Since the Sound expander on the Always on Top page had a single
setting, turning that into a card.

Before:

![image](https://github.com/user-attachments/assets/04ec18f1-06a4-4185-ac50-655070dcf3fc)

After:

![image](https://github.com/user-attachments/assets/e5d62e00-5d0a-4a2d-9011-493232689f41)


Simplified UI + less XAML for diagnostics data:

Before:

![image](https://github.com/user-attachments/assets/c0b0468b-7587-4684-8fbf-bad856e4d30c)

After:

![image](https://github.com/user-attachments/assets/185f2ff8-a3b1-49bd-8617-24b2c5a454a2)



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## PR Checklist

- [ ] **Closes:** #xxx
- [ ] **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

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## Detailed Description of the Pull Request / Additional comments

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---------

Co-authored-by: Kai Tao <kaitao@microsoft.com>

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

@@ -88,16 +88,9 @@
                         </tkcontrols:SettingsExpander.Items>
                     </tkcontrols:SettingsExpander>
 
-                    <tkcontrols:SettingsExpander
-                        x:Uid="AlwaysOnTop_SoundTitle"
-                        HeaderIcon="{ui:FontIcon Glyph=&#xE7F3;}"
-                        IsExpanded="True">
-                        <tkcontrols:SettingsExpander.Items>
-                            <tkcontrols:SettingsCard ContentAlignment="Left">
-                                <CheckBox x:Uid="AlwaysOnTop_Sound" IsChecked="{x:Bind ViewModel.SoundEnabled, Mode=TwoWay}" />
-                            </tkcontrols:SettingsCard>
-                        </tkcontrols:SettingsExpander.Items>
-                    </tkcontrols:SettingsExpander>
+                    <tkcontrols:SettingsCard x:Uid="AlwaysOnTop_Sound" HeaderIcon="{ui:FontIcon Glyph=&#xE7F3;}">
+                        <ToggleSwitch IsOn="{x:Bind ViewModel.SoundEnabled, Mode=TwoWay}" />
+                    </tkcontrols:SettingsCard>
                 </controls:SettingsGroup>
 
                 <controls:SettingsGroup x:Uid="ExcludedApps" IsEnabled="{x:Bind ViewModel.IsEnabled, Mode=OneWay}">