Native v8.1.11

This release introduces a "Meet your Tlonbot" onboarding section and resolves performance issues with background sync and push notifications, fixes notebook post scrolling, and restores the missing Members role in channel permissions.

• Adds a "Meet your Tlonbot" section to the onboarding tour
• Fixes an issue where background fetch processes would collide with sync on app open
• Fixes an issue where opening the app from a push notification would result in sluggish performance
• Fixes an issue where some notebook posts were not scrollable
• Fixes a regression where the "Members" role disappeared from the channel permissions settings screen