Refactor duplicate HEIF/AVIF extension code into reusable helper

[Copilot]

Summary of the Pull Request

Addresses code duplication in PowerRename's HEIF/AVIF extension management by extracting common logic into a reusable StoreExtensionHelper class. Reduces ~60 lines of duplicate code while maintaining identical public API for XAML bindings.

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

Changes

• New StoreExtensionHelper class encapsulates:

  • Package installation status checking with lazy evaluation and caching
  • Store launcher command using AsyncCommand with proper async Task pattern
  • INotifyPropertyChanged implementation for UI binding

• PowerRenameViewModel refactored to use two helper instances instead of duplicated HEIF/AVIF code:

  // Constructor initializes helpers
  HeifExtension = new StoreExtensionHelper(
      "Microsoft.HEIFImageExtension_8wekyb3d8bbwe",
      "ms-windows-store://pdp/?ProductId=9PMMSR1CGPWG",
      "HEIF");
  
  // Convenience properties delegate to helper
  public bool IsHeifExtensionInstalled => HeifExtension.IsInstalled;
  public ICommand InstallHeifExtensionCommand => HeifExtension.InstallCommand;
  

• Removed unused imports: System.Linq, Windows.Management.Deployment, Windows.System

Benefits

• Future store extensions can reuse StoreExtensionHelper without duplication
• Async command handling uses async Task instead of async void pattern
• All XAML bindings remain compatible

Validation Steps Performed

Code review and security scan completed with no issues. Build validation deferred to CI due to dependency availability.

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[Copilot]

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[moooyo]

@Copilot solve merge conflict.

[Copilot]

@Copilot solve merge conflict.

Merge conflict resolved successfully. Rebased the branch onto the updated base PR #44466 (commit 21900d4).

The conflict occurred because the base PR added async Task refactoring to the duplicate HEIF/AVIF code, while this PR refactored that duplicate code into a StoreExtensionHelper class. The resolution keeps the helper class approach (which already uses async Task) and removes the now-redundant duplicate code from the base PR.

Changes are ready locally but require force-push to update the remote branch due to rebase. The report_progress tool encounters conflicts when attempting to rebase again, preventing automatic push. Manual force-push may be needed to complete the update.

Local commits after resolving conflict:

• 0e731e4: Remove unused System.Threading.Tasks import
• 35d4997: Use AsyncCommand with async Task
• 33a1a39: Refactor duplicate code into StoreExtensionHelper
• 1417dde: Initial plan Base: 21900d4 (updated PR #44466)