fix: complete the expression syntax in variable replacement

Author: CC11001100

js/i18n/i18n-case-detail.js

@@ -131,7 +131,7 @@ class I18nCaseDetail {
                     `(window.currentLang === 'zh-CN' ? '❌ 未能完全绕过 debugger 断点' : '❌ Failed to completely bypass the debugger breakpoint')`);
 
                 // 处理变量重复声明问题
-                newContent = newContent.replace(/let\s+isTestRunning/g, 'window.isTestRunning = window.isTestRunning ||');
+                newContent = newContent.replace(/let\s+isTestRunning/g, 'window.isTestRunning = window.isTestRunning || false');
 
                 // 在脚本开头添加当前语言变量（如果不存在）
                 newContent = `if (typeof window.currentLang === 'undefined') { window.currentLang = "${currentLang}"; }\n` + newContent;