fix: 修复测试无法自然退出 — forceExit + 减少延迟 + 拆分 coverage

- jest.config.cjs: forceExit:true + testTimeout:15000

- package.json: npm test 默认不再 --coverage

- tests/utils.test.ts: debounce 延迟 50->20, 100->50

tests/utils.test.ts

@@ -40,25 +40,25 @@ describe('escapeHTML', () => {
 describe('debounce', () => {
   test('延迟执行', (done) => {
     let called = 0;
-    const fn = debounce(() => { called++; }, 50);
+    const fn = debounce(() => { called++; }, 20);
     fn();
     expect(called).toBe(0);
     setTimeout(() => {
       expect(called).toBe(1);
       done();
-    }, 100);
+    }, 50);
   });
 
   test('多次调用只执行最后一次', (done) => {
     let result = 0;
-    const fn = debounce((v: number) => { result = v; }, 50);
+    const fn = debounce((v: number) => { result = v; }, 20);
     fn(1);
     fn(2);
     fn(3);
     setTimeout(() => {
       expect(result).toBe(3);
       done();
-    }, 100);
+    }, 50);
   });
 });