Replace generic "Wazer" chat icons with user profile pictures

This idea was raised by gncnpk at the 2026 NA Mega Meet-up

Currently, the Waze chat displays a generic blue-and-white Wazer icon for all users, making it difficult to distinguish between different people at a glance. It would be beneficial to have this icon replaced by actual user profile pictures.

This would improve visual clarity and help manage multiple conversations more effectively.