Add ANSI color rendering and terminal themes

src/session_tab.h

@@ -10,6 +10,7 @@
 #include <optional>
 
 class QLabel;
+class QComboBox;
 class QPlainTextEdit;
 class QPushButton;
 class QThread;
@@ -64,6 +65,7 @@ private:
     QPushButton* m_reconnectButton;
     QPushButton* m_copyErrorButton;
     QPushButton* m_clearTerminalButton;
+    QComboBox* m_themeSelector;
     QToolButton* m_toggleDetailsButton;
     QToolButton* m_toggleEventsButton;
     QWidget* m_detailsPanel;