v1.1.0

Implemented Chat session/coordinator layer; Refactored ChatViewModel

• Added: IChatSession, IChatCoordinator
• Updated: refactor ChatViewModel to use new session and coordinator services to offload work
• Fixed: Conversation/Message sync across Chat and Overlay via shared session

Refactor UI design to a Terminal-like theme; Improve UX across views

• Updated: Moved WPF from MaterialDesign to a custom TerminalTheme.xaml; applied across Chat, Overaly, Settings and Setup views

v1.0.0

Refactor project architecture and consolidate infrastructure in #5