chore(a11y): merge labelConfig with defaults

packages/system/src/utils/general.ts

@@ -16,6 +16,8 @@ import type {
 import { type Viewport } from '../types';
 import { getNodePositionWithOrigin, isInternalNodeBase } from './graph';
 
+import { defaultLabelConfig, type LabelConfig } from '../constants';
+
 export const clamp = (val: number, min = 0, max = 1): number => Math.min(Math.max(val, min), max);
 
 export const clampPosition = (
@@ -418,3 +420,7 @@ export function withResolvers<T>(): {
   });
   return { promise, resolve, reject };
 }
+
+export function mergeLabelConfig(partial?: Partial<LabelConfig>): LabelConfig {
+  return { ...defaultLabelConfig, ...(partial || {}) };
+}