Introduce observable and computed values, typed widget bindings, validation groups, UI properties, commands, and UI-thread delivery.
Add observable vector and list model support for incrementally updated collections, with filtering and source-row mapping.
Modernize the Flight Booker and CRUD examples and add focused data handling and collection examples demonstrating the new APIs.
Organize the UI binding headers under ui/databinding, expand test coverage for notification and lifetime semantics, and document API selection, validation, ownership, threading, and performance behavior.
