[Cmdpal] Screen reader announces "Enter Alias" instead of "Alias" in ExtensionPage (#45906)

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## Summary of the Pull Request
Fixes a screen reader accessibility issue where the Alias TextBox in the
ExtensionPage settings was announcing "Enter Alias" as its accessible
name instead of just "Alias", making it confusing for users relying on
assistive technology.

This is part of the a11y bug batch.
User Impact:
Duplicate announcements can confuse users, increase cognitive load, and
slow down interaction for users relying on assistive technologies.

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- [ ] Closes: #xxx
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https://github.com/user-attachments/assets/3a676226-0b07-4e60-b2d8-99ae46ff5b64

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

@@ -105,10 +105,11 @@
                                                     <controls:SettingsCard x:Uid="Settings_ExtensionPage_GlobalHotkey_SettingsCard">
                                                         <cpcontrols:ShortcutControl HotkeySettings="{x:Bind Hotkey, Mode=TwoWay}" />
                                                     </controls:SettingsCard>
-                                                    <controls:SettingsCard x:Uid="Settings_ExtensionPage_Alias_SettingsCard">
+                                                    <controls:SettingsCard x:Name="AliasSettingsCard" x:Uid="Settings_ExtensionPage_Alias_SettingsCard">
                                                         <TextBox
                                                             x:Uid="Settings_ExtensionPage_Alias_PlaceholderText"
                                                             MinWidth="{StaticResource SettingActionControlMinWidth}"
+                                                            AutomationProperties.LabeledBy="{x:Bind AliasSettingsCard}"
                                                             Text="{x:Bind AliasText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
                                                     </controls:SettingsCard>
                                                     <controls:SettingsCard x:Uid="Settings_ExtensionPage_AliasActivation_SettingsCard" IsEnabled="{x:Bind AliasText, Converter={StaticResource StringEmptyToBoolConverter}, Mode=OneWay}">

src/modules/cmdpal/Microsoft.CmdPal.UI/Strings/en-us/Resources.resw

@@ -314,6 +314,9 @@ Right-click to remove the key combination, thereby deactivating the shortcut.</v
   <data name="Settings_ExtensionPage_Alias_SettingsCard.Description" xml:space="preserve">
     <value>A short keyword used to navigate to this command.</value>
   </data>
+  <data name="Settings_ExtensionPage_Alias_SettingsCard.[using:Microsoft.UI.Xaml.Automation]AutomationProperties.Name" xml:space="preserve">
+    <value>Alias</value>
+  </data>
   <data name="Settings_ExtensionPage_AliasActivation_SettingsCard.Header" xml:space="preserve">
     <value>Alias activation</value>
   </data>
@@ -463,6 +466,9 @@ Right-click to remove the key combination, thereby deactivating the shortcut.</v
   <data name="Settings_ExtensionPage_Alias_PlaceholderText.PlaceholderText" xml:space="preserve">
     <value>Enter alias</value>
   </data>
+  <data name="Settings_ExtensionPage_Alias_PlaceholderText.[using:Microsoft.UI.Xaml.Automation]AutomationProperties.Name" xml:space="preserve">
+    <value>Alias</value>
+  </data>
   <data name="StatusMessagesButton.[using:Microsoft.UI.Xaml.Automation]AutomationProperties.Name" xml:space="preserve">
     <value>Show status messages</value>
   </data>