feat: review Apple Photos duplicates through PhotoKit

[seonghobae]

Outcome

• inventories Apple Photos through PhotoKit without traversing managed library packages
• disables network access for resource evidence, preserving iCloud-only originals without downloading them
• groups only exact SHA-256 matches and keeps measured quality dimensions separate
• requires an explicit keeper, fresh plan-bound phrase, rationale, full participant re-fetch/re-hash, Photos system confirmation, and a create-new receipt
• fails closed outside macOS and exposes the next customer action

Verification

• cargo test -p disksage photos_library --lib (5 passed)
• npm test -- --run src/lib/photosLibraryState.test.ts (1 passed)
• npm run build
• macOS browser screenshot inspected at 1440x5200; 44px controls, focus styling, next-action copy, and responsive layout are present
• no live Photos mutation was performed

Research

• Apple. (n.d.). Delivering an enhanced privacy experience in your Photos app. https://developer.apple.com/documentation/photokit/delivering-an-enhanced-privacy-experience-in-your-photos-app
• Apple. (n.d.). PHPhotoLibrary. https://developer.apple.com/documentation/photos/phphotolibrary
• Apple. (n.d.). PHAssetChangeRequest. https://developer.apple.com/documentation/photos/phassetchangerequest
• Apple. (n.d.). Requesting changes to the photo library. https://developer.apple.com/documentation/photokit/requesting-changes-to-the-photo-library

Stacked on #316.

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