Review comments

src/main.cpp

@@ -350,6 +350,8 @@ void loop() {
   // Track power button hold for sleep.  We require a fresh press edge (wasPressed)
   // before starting to measure hold time, so that a hold carried over from boot
   // (wake-up press) is never misinterpreted as a "go to sleep" press.
+  // The power button long-press is not user-remappable, so this path always owns it.
+  // Sleep mapped to other buttons is handled by the dispatcher's BTN_SLEEP case below.
   static unsigned long powerHoldStart = 0;
   if (gpio.wasPressed(HalGPIO::BTN_POWER)) {
     powerHoldStart = millis();