Create, edit and delete tasks inside a project

[NomadicAlternative]

Source: specs/001-taskflow-mvp/spec.md — User Story 3 (P3)

Acceptance criteria

• A task can be added to a project with a title
• A task title can be edited
• A task can be deleted and does not reappear after a refresh
• Two tasks with the same title in one project are allowed and stay distinguishable
• Deleting a project that still has tasks is handled deliberately, not by accident