show chip overheat if over 70C

Core/Src/Gui/app_gui.c

@@ -138,6 +138,12 @@ static void draw_common_overlay() {
     SPRINTF(stmp, "%5.1f°C →%3d°C", app_temp_read_oven(), (int) app_heater_get_target());
     fb_text(3, 3, stmp, FONT_3X5, 1);
 
+    float soc = app_temp_read_soc();
+    if (soc > 70) {
+        SPRINTF(stmp, "! CHIP %d°C !", (int) soc);
+        fb_text(3, 14, stmp, FONT_3X5, 1);
+    }
+
     if (app_heater_get_state()) {
         fb_frame(0, 0, FBW, 11, 1, 1);
     }