What factors should I prioritize when selecting a child seat for my ebike, considering safety, comfort, and compatibility, and are there any innovative designs or features that can enhance the overall cycling experience for both me and my child? Should I opt for a front-mounted or rear-mounted seat, and what are the trade-offs between the two in terms of handling and stability? How can I ensure a secure and comfortable fit for my child, and what are the key considerations for integrating the seat with my ebikes existing components, such as the battery and luggage rack? Are there any industry standards or certifications that I should look for when evaluating child seats, and how can I balance my desire for a high-quality seat with the need for affordability and practicality?