[CmdPal] Settings UX tweaks (#42303)

## Summary of the Pull Request

Clean up of the Settings app with some minor styling changes.

- Moved activation key related settings into the Activation expander.
- On the Extensions page, seperated the alias settings for improved a11y
- Added a card to the extensions settings frame

<img width="1051" height="935" alt="image"
src="https://github.com/user-attachments/assets/05ae5794-8e30-4af0-aa38-a3f600aa6749"
/>

## 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: Jiří Polášek <me@jiripolasek.com>

src/modules/cmdpal/Microsoft.CmdPal.UI/Settings/GeneralPage.xaml

@@ -37,22 +37,20 @@
                     <!--  'Activation' section  -->
 
                     <TextBlock x:Uid="ActivationSettingsHeader" Style="{StaticResource SettingsSectionHeaderTextBlockStyle}" />
-
                     <controls:SettingsExpander
                         x:Uid="Settings_GeneralPage_ActivationKey_SettingsExpander"
                         HeaderIcon="{ui:FontIcon Glyph=&#xEDA7;}"
                         IsExpanded="True">
                         <ptControls:ShortcutControl HotkeySettings="{x:Bind viewModel.Hotkey, Mode=TwoWay}" />
-
                         <controls:SettingsExpander.Items>
-                            <controls:SettingsCard x:Uid="Settings_GeneralPage_LowLevelHook_SettingsCard">
-                                <ToggleSwitch IsOn="{x:Bind viewModel.UseLowLevelGlobalHotkey, Mode=TwoWay}" />
+                            <controls:SettingsCard ContentAlignment="Left">
+                                <ptControls:CheckBoxWithDescriptionControl x:Uid="Settings_GeneralPage_LowLevelHook_SettingsCard" IsChecked="{x:Bind viewModel.UseLowLevelGlobalHotkey, Mode=TwoWay}" />
+                            </controls:SettingsCard>
+                            <controls:SettingsCard ContentAlignment="Left">
+                                <ptControls:CheckBoxWithDescriptionControl x:Uid="Settings_GeneralPage_IgnoreShortcutWhenFullscreen_SettingsCard" IsChecked="{x:Bind viewModel.IgnoreShortcutWhenFullscreen, Mode=TwoWay}" />
                             </controls:SettingsCard>
                         </controls:SettingsExpander.Items>
                     </controls:SettingsExpander>
-                    <controls:SettingsCard x:Uid="Settings_GeneralPage_IgnoreShortcutWhenFullscreen_SettingsCard" HeaderIcon="{ui:FontIcon Glyph=&#xE7FC;}">
-                        <ToggleSwitch IsOn="{x:Bind viewModel.IgnoreShortcutWhenFullscreen, Mode=TwoWay}" />
-                    </controls:SettingsCard>
                     <controls:SettingsCard x:Uid="Settings_GeneralPage_GoHome_SettingsCard" HeaderIcon="{ui:FontIcon Glyph=&#xE80F;}">
                         <ToggleSwitch IsOn="{x:Bind viewModel.HotkeyGoesHome, Mode=TwoWay}" />
                     </controls:SettingsCard>