Inbox and Scheduler Polish

What improved
- Inbox was reshaped into a more focused conversation workspace with route-backed compose, client search, assignment counts, avatars, timestamps, and better long-message handling.
- Staff can now start texts from client context and land on the right conversation from older links.
- Scheduler settings are easier to scan with real tabs, filtered inactive locations and appointment types, and improved availability modals.
- Notes, tasks, and contact highlights now show more useful recent context.
Fixes and polish
- Contact phone display, date entry, task filters, and invalid timestamp handling were tightened.
- Message sending now uses the organization's Twilio sender and resolves the correct SMS phone more consistently.
See CoolFocus in action
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