both button press locks device in joystick ui

zephcore/helpers/ui-joystick/joystick_defs.h

@@ -22,6 +22,7 @@
 #define KEY_ENTER_LONG  0xF1   /* long press enter */
 #define KEY_TO_TOP      0xF2   /* long press up   → page up   */
 #define KEY_TO_BOTTOM   0xF3   /* long press down → page down */
+#define KEY_LOCK        0xF4   /* user button + joystick center held together → screen lock */
 
 /* Global action keys emitted by multi tap filter, handled in loop() */
 #define KEY_FLOOD_ADVERT  0x42   /* INPUT_KEY_B: 2 taps → flood advert */

zephcore/helpers/ui-joystick/joystick_ui_task.cpp

@@ -372,6 +372,32 @@ static void joystick_ui_input_cb(struct input_event *evt, void *user_data)
 	}
 #endif
 
+	/* Screen-lock combo: user button (INPUT_KEY_0) + joystick center
+	 * (INPUT_KEY_ENTER) held simultaneously. Tracked on raw press/release,
+	 * which are visible here on the global input bus before the per-key
+	 * handling below (INPUT_KEY_0 is otherwise only consumed by the
+	 * longpress/multi-tap filters). Latched so it fires once per combo
+	 * until at least one of the two is released; the stray key events the
+	 * two buttons emit afterwards land in the locked handler harmlessly. */
+	static bool s_userbtn_down;
+	static bool s_center_down;
+	static bool s_lock_combo_latched;
+	if (evt->code == INPUT_KEY_0) {
+		s_userbtn_down = (evt->value != 0);
+	} else if (evt->code == INPUT_KEY_ENTER) {
+		s_center_down = (evt->value != 0);
+	}
+	if (s_userbtn_down && s_center_down) {
+		if (!s_lock_combo_latched) {
+			s_lock_combo_latched = true;
+			if (joystick_queue_initialized) {
+				JoystickUITask::enqueueKey(KEY_LOCK);
+			}
+		}
+	} else {
+		s_lock_combo_latched = false;
+	}
+
 	/* Long press fires on RELEASE so hold duration is known */
 	if (evt->code == INPUT_KEY_ENTER) {
 		if (evt->value) {
@@ -809,6 +835,18 @@ void JoystickUITask::loop()
 			continue;
 		}
 
+		if (key == KEY_LOCK) {
+			/* Manual lock combo — engage now and stop the idle timer
+			 * (unlock reschedules it). Same locked state the idle
+			 * lockTimerCb would set. */
+			_locked = true;
+			_lock_step = 0;
+			k_timer_stop(&_lock_timer);
+			_render_immediate = true;
+			_pending_render = true;
+			continue;
+		}
+
 		scheduleLockTimer();
 		bool consumed = false;
 		if (key == KEY_BUZZ_TOGGLE) {