fix(smartfuzzy): handle empty search strings safely and update tests for stricter TypeScript compatibility

test/test.objectsorter.ts

@@ -1,4 +1,4 @@
-import { expect, tap } from '@push.rocks/tapbundle';
+import { expect, tap } from '@git.zone/tstest/tapbundle';
 import * as smartfuzzy from '../ts/index.js';
 
 class Car {
@@ -73,11 +73,11 @@ tap.test('should sort objects by multiple field search', async () => {
   // fuzzy matching algorithm's threshold setting
 
   // BMW should be the first result
-  const bmwIndex = result.findIndex(r => r.item.brand === 'BMW');
+  const bmwIndex = result.findIndex((fuzzyResult) => fuzzyResult.item.brand === 'BMW');
   expect(bmwIndex).toEqual(0);
 
   // If Toyota is in results, it should be ranked lower than BMW
-  const toyotaIndex = result.findIndex(r => r.item.brand === 'Toyota');
+  const toyotaIndex = result.findIndex((fuzzyResult) => fuzzyResult.item.brand === 'Toyota');
   if (toyotaIndex !== -1) {
     expect(bmwIndex).toBeLessThan(toyotaIndex);
   }