Tasks

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

Latest Evidence