iOS: Dashboard, inbox filters, and team roles

Dashboard, inbox filters, and team roles now available on iOS.

• Dashboard tab with conversation volume, response times, and peak timing heatmap
• Filter pills in inbox: narrow by status or assignee in two taps
• Team role management: assign owner or viewer permissions from your phone
• On-device conversation summaries using Apple ML, works offline
• Haptic feedback throughout the app
• Grouped bubble styles for consecutive messages
• Deterministic avatar colors per user