# Tasks

- [x] Update theme tokens for `mecha-black` default and selectable `magical-girl`.
- [x] Rework shared CSS shell, collapsible sidebar menu, and surface materials for distinct mecha vs magical frames.
- [x] Refactor `AppShell` navigation into expanded full-menu and collapsed icon-rail states.
- [x] Replace canvas particles with a background image layer plus lightweight global particle DOM layer.
- [x] Update theme docs and tests for the new visual direction.
- [x] Run verification: theme tests, typecheck/build where practical, structure check, OpenSpec strict validation, and browser walkthrough.

## Latest Evidence

- Pending rerun after the sidebar and particle-layer correction.