feat: centralize frontend Vuetify styling

docs/TASKS/frontend/002-style-system-baseline.md

@@ -0,0 +1,27 @@
+# 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.