Refactor GUI Architecture And Dashboard Presentation

[Dumdart]

Summary

Refactors the GUI into clearer component and presentation layers, improves dashboard snapshot handling, and updates the application’s visual design.

Changes

Refactoring

• Reorganize GUI components, view-model logic, theming, and topic presentation.
• Simplify dashboard API and snapshot integration.

Improvements

• Refresh the application header, workspace, topic details, subscription settings, publish pane, observer tree, and log console.
• Add and update design QA documentation.
• Expand and align GUI, dashboard, view-model, application, and presentation tests.

Testing

• Updated and expanded the affected automated test suites.