[Shortcut Guide] Render key names instead of raw numeric key codes (#48037)

## Summary of the Pull Request

Shortcut Guide was rendering raw numeric key codes in key visuals for
some shortcuts (notably generated PowerToys shortcuts), showing numbers
where key characters/names were expected. This change normalizes numeric
key handling so display output matches actual key labels.

## PR Checklist

- [ ] **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

## Detailed Description of the Pull Request / Additional comments

- **Scope**
- Updated `ShortcutDescriptionToKeysConverter` in `ShortcutGuide.Ui`
only.

- **Behavior change**
- Numeric key codes are no longer passed through as raw integers by
default.
- Arrow keys (`37/38/39/40`) remain numeric to preserve existing glyph
rendering behavior.
- All other numeric key codes are converted to display names via
`Helper.GetKeyName(...)`.

- **Result**
- Shortcut Guide key caps now show expected characters/key names instead
of numeric values for manifest-provided numeric keys.

```csharp
if (int.TryParse(key, out int keyCode))
{
    switch (keyCode)
    {
        case 38:
        case 40:
        case 37:
        case 39:
            shortcutList.Add(keyCode); // keep glyph path
            break;
        default:
            shortcutList.Add(Helper.GetKeyName((uint)keyCode)); // show key label
            break;
    }
}
```

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Author: 3 people

src/modules/ShortcutGuide/ShortcutGuide.Ui/Converters/ShortcutDescriptionToKeysConverter.cs

@@ -58,10 +58,22 @@ public List<object> GetKeysList(ShortcutDescription description)
 
             foreach (var key in description.Keys)
             {
-                // Try to parse a string key number to a VirtualKey
+                // Try to parse a string key number to a key code
                 if (int.TryParse(key, out int keyCode))
                 {
-                    shortcutList.Add(keyCode);
+                    switch (keyCode)
+                    {
+                        // https://learn.microsoft.com/uwp/api/windows.system.virtualkey?view=winrt-20348
+                        case 38: // The Up Arrow key or button.
+                        case 40: // The Down Arrow key or button.
+                        case 37: // The Left Arrow key or button.
+                        case 39: // The Right Arrow key or button.
+                            shortcutList.Add(keyCode);
+                            break;
+                        default:
+                            shortcutList.Add(Microsoft.PowerToys.Settings.UI.Library.Utilities.Helper.GetKeyName((uint)keyCode));
+                            break;
+                    }
                 }
                 else
                 {