diff --git a/custom_components/bahmcloud_store/__init__.py b/custom_components/bahmcloud_store/__init__.py
index df43093..79efe02 100644
--- a/custom_components/bahmcloud_store/__init__.py
+++ b/custom_components/bahmcloud_store/__init__.py
@@ -4,16 +4,16 @@ import logging
 from datetime import timedelta
 
 from homeassistant.core import HomeAssistant
-from homeassistant.components import frontend
 from homeassistant.const import Platform
 from homeassistant.helpers.event import async_track_time_interval
+from homeassistant.helpers.discovery import async_load_platform
+from homeassistant.components.panel_custom import async_register_panel
 
 from .store import BahmcloudStore, StoreConfig, StoreError
 
 _LOGGER = logging.getLogger(__name__)
 
 DOMAIN = "bahmcloud_store"
-PLATFORMS = [Platform.UPDATE]
 
 DEFAULT_STORE_URL = "https://git.bahmcloud.de/bahmcloud/ha_store/raw/branch/main/store.yaml"
 CONF_STORE_URL = "store_url"
@@ -26,27 +26,28 @@ async def async_setup(hass: HomeAssistant, config: dict) -> bool:
     store = BahmcloudStore(hass, StoreConfig(store_url=store_url))
     hass.data[DOMAIN] = store
 
-    # Sidebar Panel
-    frontend.async_register_built_in_panel(
-        hass,
-        component_name=DOMAIN,
-        sidebar_title="Bahmcloud Store",
-        sidebar_icon="mdi:store",
-        frontend_url_path="bahmcloud-store",
-        config={},
-        require_admin=True,
-    )
-
-    # HTTP (Panel static + API)
+    # HTTP Views (Panel static + JSON API)
     await store.register_http_views()
 
-    # Initial load
+    # Sidebar Panel (Custom Panel + JS module)
+    await async_register_panel(
+        hass,
+        frontend_url_path="bahmcloud-store",
+        webcomponent_name="bahmcloud-store-panel",
+        module_url="/api/bahmcloud_store_static/panel.js",
+        sidebar_title="Bahmcloud Store",
+        sidebar_icon="mdi:store",
+        require_admin=True,
+        config={},
+    )
+
+    # Initialer Index-Load
     try:
         await store.refresh()
     except StoreError as e:
         _LOGGER.error("Initial store refresh failed: %s", e)
 
-    # Periodisch NUR index+latest versions refresh (keine Auto-Install)
+    # Nur Liste + Latest-Versionen regelmäßig aktualisieren (keine Auto-Install)
     async def periodic(_now) -> None:
         try:
             await store.refresh()
@@ -54,13 +55,11 @@ async def async_setup(hass: HomeAssistant, config: dict) -> bool:
         except StoreError as e:
             _LOGGER.warning("Periodic refresh failed: %s", e)
 
-    async_track_time_interval(
-        hass,
-        periodic,
-        timedelta(seconds=store.refresh_seconds or 300),
-    )
+    # Falls store.yaml refresh_seconds enthält, nutze das, sonst 300s
+    interval_seconds = store.refresh_seconds if getattr(store, "refresh_seconds", None) else 300
+    async_track_time_interval(hass, periodic, timedelta(seconds=int(interval_seconds)))
 
-    # Update entities laden (damit Updates in Settings erscheinen)
-    await hass.helpers.discovery.async_load_platform(Platform.UPDATE, DOMAIN, {}, config)
+    # Update platform laden (damit Updates in Settings erscheinen)
+    await async_load_platform(hass, Platform.UPDATE, DOMAIN, {}, config)
 
     return True