Add Desktop Peek to Shortcut Guide Windows shortcuts

[Copilot]

Summary of the Pull Request

Shortcut Guide was missing the Windows desktop peek shortcut (Win + ,) from the Windows shell shortcuts it displays. This update adds the missing entry and pins it with a focused manifest test.

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

• Shortcut manifest

  • Adds Peek at desktop temporarily to the Windows shell manifest in the Windows key section.
  • Models the shortcut as Win + ,, matching the OS behavior Shortcut Guide should surface.

• Regression coverage

  • Adds a focused unit test that deserializes +WindowsNT.Shell.en-US.yml and asserts the Desktop Peek entry is present with the expected shortcut payload.

- Name: Peek at desktop temporarily
  Shortcut:
    - Win: true
      Ctrl: false
      Shift: false
      Alt: false
      Keys:
        - ","

Validation Steps Performed

• Parsed the updated +WindowsNT.Shell.en-US.yml manifest and verified the new entry is present in the Windows key section.
• Added a manifest-focused unit test covering the new shortcut entry.

• Fixes Shortcut Guide Missing Desktop Peek #49458

[azure-pipelines]

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[niels9001]

@copilot Remove the test

[Copilot]

@copilot Remove the test

Addressed in 06f08d5.