Show errors and warnings on the display (_ERROR, _WARN)

action_raise_error aborts while the macro renders, so an M117 in the same
macro never ran and errors such as the RESUME lane check only reached the
console. messages.cfg adds _ERROR (M117, then raise in a separate macro)
and _WARN (RESPOND TYPE=error + M117); all errors and warnings use them.
PAUSE shows AFC's error as the pause reason; RESUME, CANCEL_PRINT and
PRINT_WARMUP clear the display.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

macros/print/pause_resume.cfg

@@ -29,6 +29,12 @@ gcode:
     {% if 'AFC' in printer %}
       {% set lane = printer.AFC.next_lane or printer.AFC.current_load or '' %}
       SET_GCODE_VARIABLE MACRO=PAUSE VARIABLE=expected_lane VALUE="'{lane}'"
+      # AFC pauses after an error: show its first line. Pauses from these
+      # macros set their own display text before calling PAUSE.
+      {% set afc_msg = printer.AFC.message|default({}) %}
+      {% if printer.AFC.error_state and afc_msg.type|default('') == 'error' and afc_msg.message|default('') %}
+        M117 Paused: {afc_msg.message.split('\n')[0]|trim}
+      {% endif %}
     {% endif %}
     SET_GCODE_VARIABLE MACRO=PAUSE VARIABLE=saved_fan_speed VALUE={printer.fan.speed}
     # Pause first, so the saved state is the print position, then retract and park
@@ -85,13 +91,16 @@ gcode:
     {% endif %}
     SET_GCODE_VARIABLE MACRO=PAUSE VARIABLE=parked VALUE=False
     SET_GCODE_VARIABLE MACRO=PAUSE VARIABLE=expected_lane VALUE="''"
+    # Clear the pause reason from the display (no comment on an M117 line: it would show)
+    M117
   {% endif %}
 
   RESUME_BASE {get_params}
   _status_printing
 
-# Raising an error aborts the whole RESUME like a failed purge check: the
-# printer stays paused and the next RESUME checks again.
+# Raising an error (_ERROR, also shown on the display) aborts the whole
+# RESUME like a failed purge check: the printer stays paused and the next
+# RESUME checks again.
 [gcode_macro _RESUME_LANE_CHECK]
 description: Stop the resume when AFC has another lane loaded than the one the print needs
 gcode:
@@ -101,9 +110,10 @@ gcode:
     {% if loaded != expected %}
       {% set obj = 'AFC_stepper ' ~ expected %}
       {% set tool = printer[obj].map if obj in printer else '?' %}
-      {action_raise_error("Lane check: the print needs %s (%s) but %s is loaded. Load %s with %s, then RESUME again (RESUME LANE_CHECK=0 resumes anyway)." % (expected, tool, loaded or 'no lane', expected, tool))}
+      _ERROR MSG="Lane check: the print needs {expected} ({tool}) but {loaded or 'no lane'} is loaded. Load {expected} with {tool}, then RESUME again (RESUME LANE_CHECK=0 resumes anyway)." DISPLAY="Lane check: load {expected} with {tool}, then RESUME"
+    {% else %}
+      RESPOND MSG="Lane check: {expected} loaded, OK"
     {% endif %}
-    RESPOND MSG="Lane check: {expected} loaded, OK"
   {% endif %}
 
 [gcode_macro _RESUME_PURGE]
@@ -124,7 +134,7 @@ gcode:
 [gcode_macro _RESUME_PURGE_VERIFY]
 gcode:
   {% if printer["gcode_macro _PURGE_CHECK_CFG"].last_failed %}
-    {action_raise_error("Purge check failed: the print stays paused. Check the extruder and lane, then RESUME again (RESUME PURGE=0 resumes without purging).")}
+    _ERROR MSG="Purge check failed: the print stays paused. Check the extruder and lane, then RESUME again (RESUME PURGE=0 resumes without purging)." DISPLAY="Purge check failed: still paused, see console"
   {% endif %}
 
 [gcode_macro _TOOLHEAD_PARK_PAUSE_CANCEL]
@@ -191,6 +201,8 @@ gcode:
   # Same cleanup as PRINT_END: heaters incl. chamber heater, fan, flow, bdwidth
   _PRINT_CLEANUP
   SET_GCODE_VARIABLE MACRO=PAUSE VARIABLE=parked VALUE=False
+  # Clear a pause reason from the display
+  M117
   _status_ready
 
 [gcode_macro M600]

macros/print/print_start_end.cfg

@@ -26,6 +26,8 @@ gcode:
 
     RESET_FAILURE
 	  CLEAR_PAUSE
+    # Clear what an earlier print or error left on the display
+    M117
 
     _motion_detected
 
@@ -299,7 +301,7 @@ gcode:
             RESTORE_GCODE_STATE NAME=_nozzle_unretract
             SAVE_VARIABLE VARIABLE=nozzle_retract VALUE=0
         {% else %}
-            RESPOND TYPE=error MSG="_NOZZLE_UNRETRACT: extruder too cold, {done} mm still retracted"
+            _WARN MSG="_NOZZLE_UNRETRACT: extruder too cold, {done} mm still retracted"
         {% endif %}
     {% endif %}