Replace a broad fetch mock expectation with a more specific one to ensure the test only asserts that the change-password endpoint was not called. This avoids false failures when other fetch calls occur by checking not.toHaveBeenCalledWith('/api/auth/change-password', expect.anything()).
Introduces 'series' and 'seriesPart' fields to the Audiobook model and database schema. Updates API routes, file organization, and path template utilities to support series metadata. Enhances chapter merging logic, improves notification backend testing, and expands test coverage for admin and API routes.