Quantum computing, grounded in principles such as superposition and entanglement, is revolutionising the design, testing, and understanding of software. While the community is working on its technical challenges, the human and collaborative aspects have received little attention. This vision paper outlines a research agenda for human-centred quantum software engineering (HC-QSE). Building on current QSE foundations, the agenda spans three interrelated themes: understanding practice, designing support, and embedding responsibility. The first calls for studying how interdisciplinary teams construct and share mental models of quantum behaviour, collaborate across disciplinary boundaries, and reason under uncertainty inherent in probabilistic computation. The second focuses on creating tools, workflows, and learning environments that enhance comprehension, interpretability, and shared accountability among practitioners, educators, and learners. The third integrates ethical reflection and equity considerations into the design and governance of quantum software ecosystems. By centering human experience within QSE, this agenda encourages cooperative, reflective, and ethically grounded approaches to building quantum software.