Add script automation and visibility options (#176)

Enhance Home Assistant script support with automation triggers and
printer card visibility control.

- Script automation: Run scripts automatically when main plug turns on/off
- Show/hide scripts on printer cards (configurable per script)
- Scripts appear in dedicated row on printer cards with quick-run buttons
- Toast notification when triggering scripts from settings/sidebar

Closes #176

backend/app/services/homeassistant.py

@@ -228,7 +228,7 @@ class HomeAssistantService:
             - domain: str
         """
         # Default domains for smart plug control
-        default_domains = {"switch", "light", "input_boolean"}
+        default_domains = {"switch", "light", "input_boolean", "script"}
 
         try:
             async with httpx.AsyncClient(timeout=self.timeout) as client:

backend/app/services/smart_plug_manager.py

@@ -195,6 +195,11 @@ class SmartPlugManager:
             logger.debug(f"Smart plug '{plug.name}' auto_off is disabled")
             return
 
+        # Skip auto-off for HA script entities (scripts can only be triggered, not turned off)
+        if plug.plug_type == "homeassistant" and plug.ha_entity_id and plug.ha_entity_id.startswith("script."):
+            logger.debug(f"Smart plug '{plug.name}' is a HA script entity, skipping auto-off")
+            return
+
         # Only auto-off on successful completion, not on failures
         # This allows the user to investigate errors before power-off
         if status != "completed":