iOS: Native integrations and conversation management

Native Calendar, Reminders, and Mail integrations plus full conversation management on iOS.

• Create follow-up calendar events linked back to the conversation
• Add reminders with conversation context, tap the notification to jump to the thread
• Compose emails with customer address and context pre-filled
• Conversation management sheet: assign, change status, or star from one place
• Assign conversations to team members directly from your phone
• Video messages show proper thumbnails, audio messages show waveforms
• Falls back to email address when customer name is not set