Enhance GUI Broker Configuration And Observer Management

[Dumdart]

Summary

Improve the GUI experience for broker configuration, connection status, observer workspace management, and MQTT topic subscriptions.

Changes

Bug Fixes

• Improve broker and observer state synchronization across the GUI and repositories.
• Refine MQTT client and subscription manager behavior.

Features

• Add or enhance broker settings and connection controls.
• Improve observer tree navigation and workspace handling.
• Extend configuration, repository, and topic service support.

Refactoring

• Streamline dependency wiring and GUI state readers/view models.
• Update broker and observer domain models for the enhanced workflow.

Improvements

• Expand automated coverage for configuration, GUI, view-model, MQTT, repository, and subscription behavior.

Testing

• Updated and expanded unit tests across the affected components.