Added scroll to top. Full scrollable parent comment and Polycentric process secret backup and automatic database recovery.

Added icon based on the system key when a polycentric user has not set a profile picture. Made managing Polycentric profile most robust. Fixed an issue where latest events were not always being shown in relation to Polycentric profiles. Added copyable (on long press) system key in Polycentric profile activity. Added tutorial videos tab and flow.

Implemented delete comment support. Implemented Comments tab. Implemented replies overlay showing parent comment.

Fix dedup in subscriptions feed, Download change directory no longer crashes, Allow uppercase letters in email for payment, Fix developer mode not enabling