# Task: Add frontend style system baseline

## Goal

Remove app-shell styling drift by routing shared chrome controls through Vuetify components and centralized theme-backed tokens.

## Scope

- Expose reusable CSS variables backed by the Vuetify theme.
- Add shared app-shell primitives for navigation buttons, icon buttons, popovers, and menu items.
- Replace native shell buttons with Vuetify controls in `App.vue`, `AppBar`, `AppSidebar`, `SidebarUserMenu`, and `WorkspaceSelector`.
- Leave feature-screen native button migration to a follow-up task because it crosses many workflows.

## Validation

```bash
cd frontend
npm run build
```

## Done

- [x] Tailwind preflight loads before Vuetify styles.
- [x] App-owned CSS loads after Vuetify styles.
- [x] Shared Vuetify defaults are centralized.
- [x] Legacy global native button/card selectors were removed.
- [x] App-shell styles use shared theme-backed tokens.