generate ui core flows

mainwindow.h

@@ -6,6 +6,8 @@
 
 class Service;
 class SessionsListModel;
+class FocusOverlay;
+class QTimer;
 
 QT_BEGIN_NAMESPACE
 QT_END_NAMESPACE
@@ -21,13 +23,34 @@ public:
   MainWindow(QWidget *parent = nullptr);
   ~MainWindow();
 
-  private slots:
+private slots:
   void on_selectVaultButton_clicked();
+  void on_newSessionButton_clicked();
+  void on_startSessionButton_clicked();
+  void on_endSessionButton_clicked();
 
-  private:
+  // Service signal handlers
+  void onActiveSessionChanged();
+  void onSessionTimerTicked(int elapsedMs);
+
+  // Active tab field editing
+  void onActiveOnelinerChanged();
+  void onActiveContentChanged();
+
+  // Overlay handlers
+  void onOverlayResetClicked();
+  void onOverlayEndSessionClicked();
+
+private:
   Ui::MainWindow *ui;
   Service *m_service;
   SessionsListModel *m_listModel;
+  FocusOverlay *m_focusOverlay;
+
+  bool m_updatingActiveFields;
+
+  void updateActiveTab();
+  QString formatDuration(int ms) const;
 };
 
 #endif // MAINWINDOW_H