Typing indicators, new dashboard, and message management

Cross-platform typing indicators, redesigned dashboard with trends, and message deletion.

• Typing indicators work across widget, webapp, and iOS
• Dashboard redesign: bento grid with week-over-week trends and sparkline charts
• Empty state guides new users through setup
• Delete messages via right-click or long-press on mobile
• Edit sent messages in real time
• SSO token visible in developer settings with one-click copy
• Push notifications distinguish new conversations from replies
• AI assistant conversations persist locally on iOS
• Scroll-to-bottom button for long conversations
• New iOS widgets: activity chart, response time, top countries