feat(client): export HevyApiClient type for external type annotations

Adds a type export for the Hevy API client, allowing consumers to properly
type variables that hold client instances.

Author: chrisdoc

src/utils/hevyClientKubb.ts

@@ -184,3 +184,9 @@ export function createClient(
 		},
 	};
 }
+
+/**
+ * Type representing the Hevy API client returned by createClient.
+ * Useful for typing variables that hold the client instance.
+ */
+export type HevyApiClient = ReturnType<typeof createClient>;