Refactor duplicate HEIF/AVIF extension code into reusable helper

[Copilot]

• Analyze the existing duplicate code for HEIF/AVIF extension support
• Create a reusable StoreExtensionHelper class to encapsulate extension management logic
• Refactor PowerRenameViewModel to use the helper class
• Update property and command exposure to work with the helper
• Address code review feedback: use AsyncCommand with async Task
• Run final code review - all comments addressed
• Run security check - no issues found
• Resolve merge conflict by rebasing onto updated base PR Add HEIF/AVIF EXIF metadata extraction and UI support #44466
• Remove unused imports after refactoring

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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 Add HEIF/AVIF EXIF metadata extraction and UI support #44466)