Implement Reactive UI Updates for MIDI-CI Device Details

This PR implements reactive UI updates for the Qt MIDI-CI tool, mirroring the observable state behavior from the Kotlin Compose implementation. The changes focus on the Initiator and Responder views as requested.

Changes Made

Core Implementation

• Timer-based Polling: Added QTimer-based polling mechanism to both InitiatorWidget and ResponderWidget to periodically check for device model changes
• Real Device Info Display: Updated InitiatorWidget to display actual device information (manufacturer, family, model, version) retrieved from ClientConnectionModel
• Dynamic List Updates: Implemented dynamic updates for profile and property lists based on real device model data

Initiator View Updates

• Added signals for device connection, disconnection, and info updates
• Implemented real-time device list updates when connections change
• Updated device info display to show actual manufacturer, family, model, version from MIDI-CI discovery replies
• Dynamic profile list showing actual profile states with group, address, and enabled status
• Property list updates based on actual metadata from connected devices

Responder View Updates

• Added timer-based polling for local profile and property changes
• Updated profile list to display actual local profile states from device model
• Implemented reactive property list updates
• Added signals for local state changes

Architecture Decisions

• Kept CIDeviceModel as pure C++ without Qt dependencies for clean separation
• Used timer-based polling instead of Qt signals in the core model to avoid tight coupling
• Maintained existing Qt signal/slot patterns in the UI layer for consistency

Testing

• Code compiles successfully with all dependencies
• Timer-based updates trigger every 1000ms to check for device model changes
• UI components properly handle missing or invalid device connections

Link to Devin run

https://app.devin.ai/sessions/1a0f94e0054a47d0a9f5fe2cf97aa04e

Requested by: Atsushi Eno (atsushieno@gmail.com)