feat: filter entity selectors by global provider filter

Provider selectors in notification tracker, command tracker, and actions
forms now only show providers matching the global provider type filter.
Command config selector in command trackers also filters by provider type.

frontend/src/routes/actions/+page.svelte

@@ -52,9 +52,11 @@
 		return caps && caps.action_types && caps.action_types.length > 0;
 	}));
 
-	let providerItems = $derived(actionProviders.map((p: any) => ({
-		value: p.id, label: p.name, icon: providerDefaultIcon(p), desc: p.type,
-	})));
+	let providerItems = $derived(actionProviders
+		.filter((p: any) => !globalProviderFilter.providerType || p.type === globalProviderFilter.providerType)
+		.map((p: any) => ({
+			value: p.id, label: p.name, icon: providerDefaultIcon(p), desc: p.type,
+		})));
 
 	// Action types for selected provider
 	let selectedProviderType = $derived(providers.find((p: any) => p.id === form.provider_id)?.type || '');