[Shortcut Guide] Render key names instead of raw numeric key codes

[Copilot]

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 for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo 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.

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;
    }
}

Validation Steps Performed

No additional validation details are included in this description.

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[noraa-junker]

Tested and LGTM

[github-actions]

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