Show steam supply pressure in turbine panel

src/reactor_sim/dashboard.py

@@ -423,6 +423,7 @@ class ReactorDashboard:
             [
                 ("Turbines", " ".join(self._turbine_status_lines())),
                 ("Rated Elec", f"{len(self.reactor.turbines)*self.reactor.turbines[0].rated_output_mw:7.1f} MW"),
+                ("Steam P", f"{state.secondary_loop.pressure:5.2f} MPa"),
                 ("Unit1 Elec", f"{state.turbines[0].electrical_output_mw:7.1f} MW" if state.turbines else "n/a"),
                 (
                     "Unit2 Elec",