Implemented new C++ logic

Client/streamhub/TriggerPanel.h

@@ -0,0 +1,16 @@
+/**
+ * @file TriggerPanel.h
+ * @brief Trigger configuration and control bar.
+ */
+
+#pragma once
+
+namespace StreamHubClient {
+class App;
+
+/**
+ * @brief Render the trigger bar (collapsed/expanded region below toolbar).
+ */
+void RenderTriggerPanel(App& app);
+
+} /* namespace StreamHubClient */