Feature/demo room

[ndorin]

This pull request introduces several enhancements and fixes to the mock device infrastructure and routing logic, focusing on improved simulation fidelity, better handling of routing midpoints, and expanded mock device support. The most notable changes include the addition of a mock lighting device, improved communication monitoring for all mock devices, and refined routing logic for midpoints and sinks.

closes #1490
closes #1491

New mock device infrastructure:

• Added MockLightingDevice, a simulated lighting scene controller with configurable scenes and a corresponding factory for config-driven instantiation. This allows for more complete simulation and testing of lighting controls.
• Introduced MockCommunicationMonitor, a status monitor that always reports as online, and integrated it into all mock devices (MockAudioDevice, MockDisplay, MockRoutingMidpoint, and the new MockLightingDevice) to provide consistent communication status simulation. [1] [2] [3] [4] [5] [6] [7]

Routing logic and device improvements:

• Enhanced routing logic for midpoints: When a route terminates on a midpoint with no unambiguous output, the code now correctly handles the switch by potentially passing a null output selector, and ensures that output port usage tracking and release are only performed when an output port exists. [1] [2] [3] [4]
• Improved GenericSink input port selection: Now tracks and exposes the last switched-to input port, uses port selectors for accurate switching, and logs warnings for invalid selectors. [1] [2] [3]

Mock routing midpoint enhancements:

• Added support for video sync feedback on input slots: The MockRoutingMidpoint now links input slots to real video sync status of transmitters, updating sync status dynamically after all devices are constructed. This improves simulation of routing scenarios involving video sync. [1] [2] [3]

Other improvements:

• Minor code cleanups and using directive additions for consistency and clarity in several files. [1] [2]

These changes collectively make the mock device infrastructure more robust, realistic, and useful for testing and simulation of complex routing and device behaviors.

[Copilot]

Copilot review overview

🟡 Changes recommended

USB routing, initial lighting feedback, and split audio/video midpoint feedback remain incorrect.

Review effort: Balanced
Findings: 4

Open (4)

• Fire initial feedback for the configured startup scene · New
• Preserve signal type when creating route descriptors · New
• Record USB routes in SetRoute · New
• Include USB in supported routing signal types · New

What changed in this PR

Enhances mock-device simulation, routing feedback, terminal midpoint handling, and development URL resolution.

Changes:

• Adds mock lighting and communication-monitor infrastructure.
• Improves midpoint, sink, and per-signal routing feedback.
• Preserves development-server URLs and emits explicit cleared source states.

File	Description
MobileControlTouchpanelController.cs	Resolves development-server URLs consistently.
IHasNamedRoutingSlotsMessenger.cs	Emits explicit per-signal route state.
ICurrentSourcesMessenger.cs	Serializes cleared sources as empty strings.
MockRoutingMidpointPropertiesConfig.cs	Adds video-sync configuration.
MockRoutingMidpoint.cs	Adds sync linking and per-signal route tracking.
MockCommunicationMonitor.cs	Adds configurable mock online status.
MockLightingDevice.cs	Adds configurable mock lighting scenes.
GenericSink.cs	Tracks the selected input port.
MockDisplay.cs	Adds communication monitoring.
MockAudioDevice.cs	Adds communication monitoring.
RouteDescriptor.cs	Handles null terminal midpoint outputs safely.
Extensions.cs	Resolves terminal midpoint outputs when unambiguous.

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