feat(power): add setting to show current status instead of action

Reddit report: the header power toggle switches correctly but
displays "backwards" - the button shows the action a click would
perform (e.g. "Aus" while the printer is on), not the printer's
actual current state, which some users find counterintuitive.

Both readings are legitimate, so this adds a per-printer opt-in
(Settings -> Power Switch -> "Aktuellen Status statt Aktion
anzeigen") rather than flipping the default for everyone.
power_status_inverted=0 (default) keeps today's behavior; =1 mirrors
the actual on/off state instead. The backend's power-status parsing
is untouched - only _applyHeaderPowerState() picks which state to
display, so the click handler still always toggles the real state
regardless of display mode.

web/themes/default/app.js

@@ -355,10 +355,17 @@ function _applyHeaderPowerState(state){
   _headerPowerState=state;
   var btn=document.getElementById('h-power-btn'), lbl=document.getElementById('h-power-lbl');
   if(!btn||!lbl)return;
-  if(state==='on'){
+  // Default: show the action a click would perform (printer on -> offer
+  // "Aus"). With power_status_inverted set (Settings -> Power Switch), show
+  // the actual current state instead (printer on -> show "An") - some users
+  // expect the button to mirror reality, not the available action.
+  var inverted=!!(_activePrinter&&_activePrinter.power_status_inverted);
+  var showOn=inverted?state==='on':state==='off';
+  var showOff=inverted?state==='off':state==='on';
+  if(showOff){
     btn.classList.remove('h-power-can-on');btn.classList.add('h-power-can-off');
     lbl.textContent=T.printers_power_off_short||'Aus';
-  }else if(state==='off'){
+  }else if(showOn){
     btn.classList.remove('h-power-can-off');btn.classList.add('h-power-can-on');
     lbl.textContent=T.printers_power_on_short||'An';
   }else{
@@ -572,6 +579,7 @@ function applyLang(){
   setText('lbl-power-off-url',T.settings_power_off_url||'Power-Off URL');
   setText('lbl-power-status-url',T.settings_power_status_url||'Status URL');
   setText('lbl-power-hint',T.settings_power_hint||'Optional: plain HTTP GET URLs for a smart plug (e.g. Tasmota) controlling the printer\'s mains power. Leave empty to hide the power button.');
+  setText('lbl-power-status-inverted',T.settings_power_status_inverted||'Show current status instead of action');
   setText('lbl-default-slot',T.settings_default_slot);
   setText('opt-slot-auto',T.settings_slot_auto);
   setText('lbl-auto-leveling',T.settings_auto_leveling);
@@ -1254,6 +1262,7 @@ function openSettings(){
     var pon=document.getElementById('s-power-on-url');if(pon)pon.value=d.power_on_url||'';
     var poff=document.getElementById('s-power-off-url');if(poff)poff.value=d.power_off_url||'';
     var pstat=document.getElementById('s-power-status-url');if(pstat)pstat.value=d.power_status_url||'';
+    var pinv=document.getElementById('s-power-status-inverted');if(pinv)pinv.checked=!!d.power_status_inverted;
     document.getElementById('s-default-slot').value=d.default_ams_slot||'auto';
     document.getElementById('s-auto-leveling').checked=(d.auto_leveling===undefined?true:!!d.auto_leveling);
     var vc=document.getElementById('s-vibration-compensation');if(vc)vc.checked=!!d.vibration_compensation;
@@ -2033,6 +2042,7 @@ function saveSettings(){
     power_on_url:     (document.getElementById('s-power-on-url')||{}).value||'',
     power_off_url:    (document.getElementById('s-power-off-url')||{}).value||'',
     power_status_url: (document.getElementById('s-power-status-url')||{}).value||'',
+    power_status_inverted: (document.getElementById('s-power-status-inverted')||{}).checked?1:0,
     default_ams_slot: document.getElementById('s-default-slot').value,
     auto_leveling:           document.getElementById('s-auto-leveling').checked?1:0,
     vibration_compensation:  (document.getElementById('s-vibration-compensation')||{}).checked?1:0,

web/themes/default/index.html

@@ -566,6 +566,10 @@
                 <input type="text" id="s-power-status-url" placeholder="http://192.168.x.x/cm?cmnd=Power">
                 <small id="lbl-power-hint" style="color:var(--txt2)"></small>
               </div>
+              <div class="modal-field" style="flex-direction:row;align-items:center;gap:10px">
+                <input type="checkbox" id="s-power-status-inverted" style="width:auto;margin:0">
+                <label id="lbl-power-status-inverted" style="margin:0;cursor:pointer" for="s-power-status-inverted">Aktuellen Status statt Aktion anzeigen</label>
+              </div>
             </div>
           </div>
 

web/translations/de.json

@@ -274,6 +274,7 @@
   "settings_power_off_url": "Ausschalt-URL",
   "settings_power_status_url": "Status-URL",
   "settings_power_hint": "Optional: einfache HTTP-GET-URLs für eine Steckdose (z.B. Tasmota), die den Drucker per Netzstrom schaltet. Leer lassen blendet den Power-Button aus.",
+  "settings_power_status_inverted": "Aktuellen Status statt Aktion anzeigen",
   "settings_mqtt_port": "MQTT-Port",
   "settings_mqtt_username_placeholder": "userXXXXXXXX",
   "settings_orca_profiles_import": "Profile importieren",

web/translations/en.json

@@ -274,6 +274,7 @@
   "settings_power_off_url": "Power-Off URL",
   "settings_power_status_url": "Status URL",
   "settings_power_hint": "Optional: plain HTTP GET URLs for a smart plug (e.g. Tasmota) controlling the printer's mains power. Leave empty to hide the power button.",
+  "settings_power_status_inverted": "Show current status instead of action",
   "settings_mqtt_port": "MQTT Port",
   "settings_mqtt_username_placeholder": "userXXXXXXXX",
   "settings_orca_profiles_import": "Import profiles",

web/translations/es.json

@@ -274,6 +274,7 @@
   "settings_power_off_url": "URL de apagado",
   "settings_power_status_url": "URL de estado",
   "settings_power_hint": "Opcional: URLs HTTP GET para un enchufe inteligente (p.ej. Tasmota) que controla la alimentación de la impresora. Déjalo vacío para ocultar el botón de encendido.",
+  "settings_power_status_inverted": "Mostrar el estado actual en lugar de la acción",
   "settings_mqtt_port": "MQTT Port",
   "settings_mqtt_username_placeholder": "userXXXXXXXX",
   "settings_orca_profiles_import": "Importar perfiles",

web/translations/fr.json

@@ -262,6 +262,7 @@
   "settings_power_off_url": "URL d'extinction",
   "settings_power_status_url": "URL de statut",
   "settings_power_hint": "Optionnel : URL HTTP GET pour une prise connectée (ex. Tasmota) contrôlant l'alimentation secteur de l'imprimante. Laisser vide masque le bouton d'alimentation.",
+  "settings_power_status_inverted": "Afficher l'état actuel au lieu de l'action",
   "settings_mqtt_port": "Port MQTT",
   "settings_mqtt_username_placeholder": "userXXXXXXXX",
   "settings_orca_profiles_import": "Importer des profils",

web/translations/it.json

@@ -262,6 +262,7 @@
   "settings_power_off_url": "URL spegnimento",
   "settings_power_status_url": "URL stato",
   "settings_power_hint": "Opzionale: URL HTTP GET per una presa smart (es. Tasmota) che controlla l'alimentazione della stampante. Lasciare vuoto per nascondere il pulsante di accensione.",
+  "settings_power_status_inverted": "Mostra lo stato attuale invece dell'azione",
   "settings_mqtt_port": "Porta MQTT",
   "settings_mqtt_username_placeholder": "userXXXXXXXX",
   "settings_orca_profiles_import": "Importa profili",

web/translations/zh-cn.json

@@ -274,6 +274,7 @@
   "settings_power_off_url": "关机 URL",
   "settings_power_status_url": "状态 URL",
   "settings_power_hint": "可选：智能插座（如 Tasmota）的 HTTP GET 控制 URL，用于控制打印机的电源。留空则隐藏电源按钮。",
+  "settings_power_status_inverted": "显示当前状态而非可执行操作",
   "settings_mqtt_port": "MQTT 端口",
   "settings_mqtt_username_placeholder": "userXXXXXXXX",
   "settings_orca_profiles_import": "导入配置文件",