- Add ARCHITECTURE.md with full system overview (data flow, modules, build)
- Add AGENTS.md as a guide for future AI agents working on this project
- Split monolithic styles.css into focused files under assets/:
variables, animations, layout, navbar, header, cards, config,
filters, utils, greet
- Fix justfile: replace `cargo run tauri dev/build` with `cargo tauri dev/build`
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>