Add persistent auto-off option for smart plugs (#826)

Auto-off now has a "Keep Enabled" toggle that keeps it active between
  prints instead of disabling after each use (one-shot). Useful for HA
  accessories like BentoBox filters that should always power off after
  prints. Default behavior (one-shot) is unchanged.

frontend/src/__tests__/components/SmartPlugCard.test.tsx

@@ -43,6 +43,7 @@ const createMockPlug = (overrides: Partial<SmartPlug> = {}): SmartPlug => ({
   enabled: true,
   auto_on: true,
   auto_off: true,
+  auto_off_persistent: false,
   off_delay_mode: 'time',
   off_delay_minutes: 5,
   off_temp_threshold: 70,
@@ -241,6 +242,51 @@ describe('SmartPlugCard', () => {
     });
   });
 
+  describe('persistent auto-off', () => {
+    it('shows Keep Enabled toggle when auto_off is enabled', async () => {
+      const user = userEvent.setup();
+      const plug = createMockPlug({ auto_off: true, auto_off_persistent: false });
+      render(<SmartPlugCard plug={plug} onEdit={mockOnEdit} />);
+
+      await user.click(screen.getByText('Automation Settings'));
+
+      await waitFor(() => {
+        expect(screen.getByText('Keep Enabled')).toBeInTheDocument();
+        expect(screen.getByText('Stay enabled between prints instead of one-shot')).toBeInTheDocument();
+      });
+    });
+
+    it('does not show Keep Enabled toggle when auto_off is disabled', async () => {
+      const user = userEvent.setup();
+      const plug = createMockPlug({ auto_off: false });
+      render(<SmartPlugCard plug={plug} onEdit={mockOnEdit} />);
+
+      await user.click(screen.getByText('Automation Settings'));
+
+      await waitFor(() => {
+        expect(screen.queryByText('Keep Enabled')).not.toBeInTheDocument();
+      });
+    });
+
+    it('shows Keep Enabled toggle for HA plugs with auto_off enabled', async () => {
+      const user = userEvent.setup();
+      const plug = createMockPlug({
+        plug_type: 'homeassistant',
+        ip_address: null,
+        ha_entity_id: 'switch.bentobox_filter',
+        auto_off: true,
+        auto_off_persistent: true,
+      });
+      render(<SmartPlugCard plug={plug} onEdit={mockOnEdit} />);
+
+      await user.click(screen.getByText('Automation Settings'));
+
+      await waitFor(() => {
+        expect(screen.getByText('Keep Enabled')).toBeInTheDocument();
+      });
+    });
+  });
+
   describe('disabled state', () => {
     it('renders plug even when disabled', () => {
       const plug = createMockPlug({ enabled: false });

frontend/src/api/client.ts

@@ -1074,6 +1074,7 @@ export interface SmartPlug {
   enabled: boolean;
   auto_on: boolean;
   auto_off: boolean;
+  auto_off_persistent: boolean;
   off_delay_mode: 'time' | 'temperature';
   off_delay_minutes: number;
   off_temp_threshold: number;
@@ -1128,6 +1129,7 @@ export interface SmartPlugCreate {
   enabled?: boolean;
   auto_on?: boolean;
   auto_off?: boolean;
+  auto_off_persistent?: boolean;
   off_delay_mode?: 'time' | 'temperature';
   off_delay_minutes?: number;
   off_temp_threshold?: number;
@@ -1174,6 +1176,7 @@ export interface SmartPlugUpdate {
   enabled?: boolean;
   auto_on?: boolean;
   auto_off?: boolean;
+  auto_off_persistent?: boolean;
   off_delay_mode?: 'time' | 'temperature';
   off_delay_minutes?: number;
   off_temp_threshold?: number;

frontend/src/components/SmartPlugCard.tsx

@@ -361,6 +361,25 @@ export function SmartPlugCard({ plug, onEdit }: SmartPlugCardProps) {
                 </label>
               </div>
 
+              {/* Auto Off Persistent */}
+              {plug.auto_off && (
+                <div className="flex items-center justify-between pl-4 border-l-2 border-bambu-dark-tertiary">
+                  <div>
+                    <p className="text-sm text-white">{t('smartPlugs.autoOffPersistent')}</p>
+                    <p className="text-xs text-bambu-gray">{t('smartPlugs.autoOffPersistentDescription')}</p>
+                  </div>
+                  <label className="relative inline-flex items-center cursor-pointer">
+                    <input
+                      type="checkbox"
+                      checked={plug.auto_off_persistent}
+                      onChange={(e) => updateMutation.mutate({ auto_off_persistent: e.target.checked })}
+                      className="sr-only peer"
+                    />
+                    <div className="w-9 h-5 bg-bambu-dark-tertiary peer-focus:outline-none rounded-full peer peer-checked:after:translate-x-full after:content-[''] after:absolute after:top-[2px] after:left-[2px] after:bg-white after:rounded-full after:h-4 after:w-4 after:transition-all peer-checked:bg-bambu-green"></div>
+                  </label>
+                </div>
+              )}
+
               {/* Delay Mode */}
               {plug.auto_off && (
                 <div className="space-y-3 pl-4 border-l-2 border-bambu-dark-tertiary">

frontend/src/i18n/locales/de.ts

@@ -3671,6 +3671,8 @@ export default {
     autoOnDescription: 'Einschalten wenn Druck startet',
     autoOff: 'Auto Aus',
     autoOffDescription: 'Ausschalten wenn Druck abgeschlossen (einmalig)',
+    autoOffPersistent: 'Aktiviert lassen',
+    autoOffPersistentDescription: 'Zwischen Drucken aktiviert bleiben statt einmalig',
     turnOffDelayMode: 'Ausschaltverzögerungsmodus',
     time: 'Zeit',
     temp: 'Temp',

frontend/src/i18n/locales/en.ts

@@ -3676,6 +3676,8 @@ export default {
     autoOnDescription: 'Turn on when print starts',
     autoOff: 'Auto Off',
     autoOffDescription: 'Turn off when print completes (one-shot)',
+    autoOffPersistent: 'Keep Enabled',
+    autoOffPersistentDescription: 'Stay enabled between prints instead of one-shot',
     turnOffDelayMode: 'Turn Off Delay Mode',
     time: 'Time',
     temp: 'Temp',

frontend/src/i18n/locales/fr.ts

@@ -3663,6 +3663,8 @@ export default {
     autoOnDescription: 'Allumer au démarrage de l\'impression',
     autoOff: 'Auto Off',
     autoOffDescription: 'Éteindre à la fin de l\'impression (unique)',
+    autoOffPersistent: 'Garder activé',
+    autoOffPersistentDescription: 'Rester activé entre les impressions au lieu d\'une seule fois',
     turnOffDelayMode: 'Mode de délai d\'extinction',
     time: 'Temps',
     temp: 'Temp',

frontend/src/i18n/locales/it.ts

@@ -3662,6 +3662,8 @@ export default {
     autoOnDescription: 'Accendi quando inizia la stampa',
     autoOff: 'Auto Off',
     autoOffDescription: 'Spegni quando la stampa è completata (una tantum)',
+    autoOffPersistent: 'Mantieni attivo',
+    autoOffPersistentDescription: 'Resta attivo tra le stampe invece di una tantum',
     turnOffDelayMode: 'Modalità ritardo spegnimento',
     time: 'Tempo',
     temp: 'Temp',

frontend/src/i18n/locales/ja.ts

@@ -3675,6 +3675,8 @@ export default {
     autoOnDescription: '印刷開始時にオンにする',
     autoOff: '自動オフ',
     autoOffDescription: '印刷完了時にオフにする（ワンショット）',
+    autoOffPersistent: '有効のまま維持',
+    autoOffPersistentDescription: 'ワンショットではなく印刷間で有効のまま維持',
     turnOffDelayMode: 'オフ遅延モード',
     time: '時間',
     temp: '温度',

frontend/src/i18n/locales/pt-BR.ts

@@ -3662,6 +3662,8 @@ export default {
     autoOnDescription: 'Ligar quando a impressão iniciar',
     autoOff: 'Auto Desligar',
     autoOffDescription: 'Desligar quando a impressão terminar (única vez)',
+    autoOffPersistent: 'Manter ativado',
+    autoOffPersistentDescription: 'Permanecer ativado entre impressões em vez de única vez',
     turnOffDelayMode: 'Modo de atraso para desligar',
     time: 'Tempo',
     temp: 'Temp',

frontend/src/i18n/locales/zh-CN.ts

@@ -3662,6 +3662,8 @@ export default {
     autoOnDescription: '打印开始时开启',
     autoOff: '自动关闭',
     autoOffDescription: '打印完成时关闭（一次性）',
+    autoOffPersistent: '保持启用',
+    autoOffPersistentDescription: '在打印之间保持启用而非一次性',
     turnOffDelayMode: '关闭延迟模式',
     time: '时间',
     temp: '温度',