Implemented qt port + e2e

Client/streamhub-qt/StatsDialog.h

@@ -0,0 +1,54 @@
+/**
+ * @file StatsDialog.h
+ * @brief Per-source statistics table + cycle-time histograms.
+ *
+ * Mirrors the ImGui StatsPanel: a metrics table (rate, lost, frags/bytes per
+ * cycle, cycle ms avg/std/min/max) and a 20-bin cycle-time histogram per
+ * source, drawn with a small QPainter bar widget.
+ */
+
+#pragma once
+
+#include "Protocol.h"
+
+#include <QDialog>
+
+class QTableWidget;
+class QVBoxLayout;
+
+namespace shq {
+
+class Hub;
+
+/** Small bar-chart widget for a 20-bin cycle-time histogram. */
+class HistogramWidget : public QWidget {
+    Q_OBJECT
+public:
+    explicit HistogramWidget(QWidget* parent = nullptr);
+    void setData(const StreamHubClient::SourceStats& st);
+    QSize sizeHint() const override { return QSize(400, 120); }
+protected:
+    void paintEvent(QPaintEvent*) override;
+private:
+    double bins_[20] = {};
+    double min_ = 0.0, max_ = 0.0;
+    bool   valid_ = false;
+};
+
+class StatsDialog : public QDialog {
+    Q_OBJECT
+public:
+    explicit StatsDialog(Hub* hub, QWidget* parent = nullptr);
+
+public Q_SLOTS:
+    void refresh();
+
+private:
+    Hub*          hub_;
+    QTableWidget* table_ = nullptr;
+    QVBoxLayout*  histLay_ = nullptr;
+    std::vector<HistogramWidget*> hists_;
+    std::vector<QWidget*>         histBlocks_;
+};
+
+} /* namespace shq */