c8ae47c0bc
Implements Task 19: Task List + Task Detail + Status Transitions UI New components: - useTasks hook: TanStack Query hooks (useTasks, useTask, useCreateTask, useUpdateTask) - Task list page: shadcn Table with status filter, pagination, status badges - Task detail page: Full task info with valid status transition buttons - New task form: Create task with title, description, assigneeId, dueDate Key features: - Status transitions match backend logic: Open→Assigned→InProgress→Review→Done - Review status allows back-transition to InProgress (only bidirectional) - Only valid next states shown as buttons (VALID_TRANSITIONS map) - Status badge colors: Open=gray, Assigned=blue, InProgress=yellow, Review=red, Done=green - TanStack Query with automatic cache invalidation on mutations - Next.js 15+ async params pattern (use() hook) TDD: - 3 task list tests (renders rows, status badges, new task button) - 3 task detail tests (Open→Assigned, InProgress→Review, Review→Done+InProgress) All tests pass (31/31). Build succeeds.