Task 02: Frontend detach actions

Acceptance

A single subtask exposes Detach from parent in the sidebar context menu and in both task-card menus; root and bulk menus do not.
Confirmation states that hierarchy changes while shared workspace access remains, and successful submission cannot be duplicated.
The Office No parent picker and mobile task actions invoke the canonical detach endpoint.

Verification

cd apps/web && rtk pnpm test -- components/task/task-switcher.test.tsx components/kanban-card-menu-items.test.tsx components/task/simple/components/parent-picker.test.tsx lib/kanban/map-task.test.ts
cd apps/web && rtk pnpm run typecheck

Files likely touched

apps/web/lib/api/domains/kanban-api.ts
apps/web/lib/api/index.ts
apps/web/lib/kanban/map-task.ts
apps/web/lib/state/slices/kanban/types.ts
apps/web/hooks/use-detach-task.ts
apps/web/components/task/task-detach-confirm-dialog.tsx
apps/web/components/task/task-switcher-context-menu.tsx
apps/web/components/task/task-switcher.tsx
apps/web/components/task/task-session-sidebar.tsx
apps/web/components/task/mobile/session-task-switcher-sheet.tsx
apps/web/components/kanban-card-menu-items.tsx
apps/web/components/kanban-card.tsx
apps/web/components/task/simple/components/parent-picker.tsx
Adjacent component and hook test files.

Dependencies

None. Implement against the approved HTTP contract; integrated verification depends on Task 01.

Inputs

Spec sections: What, API surface, Scenarios.
Existing menu patterns in task-switcher-context-menu.tsx and kanban-card-menu-items.tsx.
Mobile parity rules in .agents/skills/mobile-parity/SKILL.md.

Output contract

Report UI/API changes, tests run, files changed, blockers, mobile risks, and update this task plus plan.md to done when acceptance passes.

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