Refactor/egui native desktop

[diegodev18]

Summary

Related issue

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes existing behavior)
• Refactor / internal cleanup (no behavior change)
• Documentation only

How tested

• cargo test --release passes
• For parser changes: verified against real ~/.claude data (e.g. the /verify-parser skill, or ./target/release/arrow --list)
• For UI changes: checked in the web dev server (npm run dev) and/or the Tauri app (cargo tauri dev)

Checklist

• cargo fmt --all --check leaves no changes
• cargo clippy --all-targets --all-features -- -D warnings passes (CI treats any clippy warning as an error)
• New code comments, identifiers, and UI text are in English
• Change respects arrow's honesty principle (does not claim more than the native data knows; only Edit/Write/MultiEdit edits are captured, never Bash changes)
• Documentation updated where needed (README.md / ROADMAP.md / SPEC.md / CLAUDE.md)
• Commit messages are in the imperative mood

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