start the graphical simulation in paused mode

src/main.cpp

@@ -37,6 +37,7 @@ void run_gui_simulation(SimulationState* sim) {
     RenderState render_state;
     setup_camera(&render_state);
 
+    // FIXME: too verbose, and/or should be an init function
     UIState ui_state;
     ui_state.body_list_scroll = 0;
     ui_state.body_list_active = -1;
@@ -85,7 +86,7 @@ void run_gui_simulation(SimulationState* sim) {
     ui_state.body_list_active = root_body_index >= 0 ? root_body_index : -1;  // Sync with selected body
     gui_init();
 
-    bool paused = false;
+    bool paused = true;
     double speed_multiplier = 32.0;
     double min_multiplier = 1.0;
     int physics_steps_per_frame = 1;