fix: keep browser overlays and knowledge controls usable

Native browser pages could cover application dialogs and overlapping menus
or notifications. Suspend only the viewport while covered and restore the
same active page afterward, including nested dialogs and terminal prompts.

Keep knowledge source controls at their full height, constrain long library
cards and titles, and update automatic names when switching remote targets
without overwriting edited or saved names. Restore packaged release-note
loading now that the history exceeds its previous size limit.

Add focused regressions and real Electron UI evidence. Clean up temporary
Harness fixture directories at test completion instead of accumulating them.

Release note: 修复内嵌浏览器遮挡弹窗和浮层、知识库来源选项被压缩及长名称显示异常；切换远端知识库时自动名称正确更新，并恢复更新说明显示。

docs/features/knowledge-base/external-knowledge-logic-design.md

@@ -68,6 +68,10 @@ Renderer 丢弃已失效的目录、详情和测试响应，不把切换前的
 
 ## 5. 创建与编辑
 
+新建绑定时，用户尚未编辑的显示名称跟随当前目录选择更新；更换实例或手工输入另一个
+目标 ID 时清除旧自动名称。用户手动填写过名称后保留该草稿。编辑或重新绑定已有库时，
+始终保留已保存的本地名称，除非用户主动修改；此修正不自动重命名已有知识库。
+
 流程为选择 `local | dify | fastgpt | ragflow`，外部类型再选择实例、目录项或手工 ID、
 显示名称、配置与测试查询。表单测试成功后允许保存；服务保存前再次执行同一查询验证，
 检查实例、绑定和唯一性是否在等待期间改变，再写入数据库。