Expand the timeline to 100% height in panel mode.

src/utils/ha/index.ts

@@ -336,3 +336,15 @@ export const getEntitiesFromHASS = (hass: HomeAssistant, domain?: string): strin
   entities.sort();
   return entities;
 };
+
+/**
+ * Determine if a card is in panel mode.
+ */
+export const isCardInPanel = (card: HTMLElement): boolean => {
+  const parent = card.getRootNode();
+  return !!(
+    parent &&
+    parent instanceof ShadowRoot &&
+    parent.host.tagName === 'HUI-PANEL-VIEW'
+  );
+};