chore: conditionally import AtomicU64 only on non-macOS

[VariableThe]

Summary

• Fixes the lone non-objc Rust warning: unused import: AtomicU64
• AtomicU64 is only used in #[cfg(not(target_os = macos))] blocks for the
  Windows/Linux focus-loss debounce mechanism. On macOS it was imported
  unconditionally, producing a warning.
• Moved the import behind #[cfg(not(target_os = macos))].

Reduces cargo check warnings from 12 to 11 (remaining 11 are all pre-existing
objc macro warnings in macos.rs).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 10011948-c269-4321-b53b-3c5ca9f27afb

📥 Commits

Reviewing files that changed from the base of the PR and between 7a974c7 and 01448d3.

📒 Files selected for processing (1)

• src-tauri/src/lib.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/cleanup-window-state-slop

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