feat(ui/alerts): shared env helper for alerting query hooks

ui/src/api/queries/alertMeta.ts

@@ -0,0 +1,24 @@
+import { useEnvironmentStore } from '../environment-store';
+import { api } from '../client';
+
+/** Returns the currently selected env slug, throwing if none is selected.
+ * Alerts routes require an env context — callers should gate on `selectedEnv`
+ * via `enabled:` before invoking these hooks.
+ */
+export function useSelectedEnvOrThrow(): string {
+  const env = useEnvironmentStore((s) => s.environment);
+  if (!env) {
+    throw new Error('Alerting requires a selected environment.');
+  }
+  return env;
+}
+
+export function useSelectedEnv(): string | undefined {
+  return useEnvironmentStore((s) => s.environment);
+}
+
+/** Re-exported openapi-fetch client for alerting query hooks.
+ * The underlying export in `../client` is named `api`; we re-export as
+ * `apiClient` so alerting hooks can import it under the plan's canonical name.
+ */
+export { api as apiClient };