feat: checkpoint PhotoKit duplicate inventory

[seonghobae]

Outcome

• audits one PhotoKit asset per native completion boundary and records measured page duration
• validates gap-free, stable-total checkpoints in Rust and only marks an exact-total audit complete
• renders progress, supports cancellation between assets, and resumes the accepted read-only checkpoint
• keeps network access disabled and adds no Photos mutation authority

Validation

• cargo test --manifest-path src-tauri/Cargo.toml photos_library::tests:: --lib (9 passed)
• npm test -- --run src/lib/photosLibraryState.test.ts (2 passed)
• npm run build
• git diff --check

Stacked on #317. No live Photos mutation was performed.

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