Fixes for scan quick look

[mpivchev]

• Fixes issue where trying to share or download the photo while in draw mode will cause a crash.
  - Issue occurs because we moveFile to a new location instead of copyFile. iOS cannot find the original location of the file, causing a crash.

• Fixes issue where a draw edit will not be saved properly and will be reset.
  - Happened because saveModifiedFile is called before didSaveEditedCopyOf , ignoring the changes.

[Copilot]

Pull request overview

This PR fixes two issues in the QuickLook viewer for scanned documents. First, it resolves a crash that occurred when sharing or downloading photos while in draw mode by using copyFile instead of moveFile (preventing iOS from losing the file reference). Second, it addresses a timing issue where draw edits weren't being saved properly by refactoring the dismiss flow to show the save alert after the view controller dismisses, giving more time for QuickLook's didSaveEditedCopyOf callback to complete.

Key Changes:

• Changed file operation from moveFile to copyFile in didSaveEditedCopyOf to prevent iOS file reference loss
• Refactored alert presentation logic into separate showSaveAlert() method
• Modified dismissView to show save alert in dismiss completion handler rather than before dismissing

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