Remove heartbeat on pixel 9

include/led_stub.h

@@ -35,8 +35,6 @@ private:
     bool initialized;
     uint32_t activity_off_time = 0;
     uint8_t saved_r = 0, saved_g = 0, saved_b = 0;
-    uint32_t heartbeat_time = 0;
-    uint8_t heartbeat_phase = 0;
     
 public:
     DefaultLedStub();

src/led_stub.cpp

@@ -294,19 +294,4 @@ void DefaultLedStub::update() {
         mux_ptr->show();
         activity_off_time = 0;
     }
-
-    // Heartbeat: pulse LED 9 slowly (amber)
-    if (now - heartbeat_time > 2000 && !activity_off_time) {
-        heartbeat_time = now;
-        heartbeat_phase = 1;
-    }
-    if (heartbeat_phase && !activity_off_time) {
-        uint8_t brightness = (heartbeat_phase < 100) ? (heartbeat_phase * 2) : (400 - heartbeat_phase * 2);
-        if (!led_states[9].active) {
-            mux_ptr->set_led_color(9, brightness, brightness / 4, 0);
-            mux_ptr->show();
-        }
-        heartbeat_phase++;
-        if (heartbeat_phase > 200) heartbeat_phase = 0;
-    }
 }