fix(renderer): 界面与设置页一轮修补

- FilePanel 上传进度监听器组件卸载时清理（原先只在终态/reject 时 off）
- MonitorPanel：首采即失败时显示中断错误条，不再被 meta 门挡成永远
  '采集中'
- HighlightImportExport：blob 下载延迟 revokeObjectURL（原先同步回收
  会中止下载）；FileReader 补 onerror
- HighlightTab 新建规则改 getState() 读法防 stale（对齐 replaceRule）
- ConnectionSidebar/CommandsPanel 三处删除/清空 handler 补 try/catch
  与 message.error（原先失败静默）
- highlightIO 导入信封补 version 校验、kind 缺失不再放行
- i18n：补 settings.highlight.builtin.percent 四语言键（原先唯一缺失
  的内置规则，非中文界面显示中文 note）

src/shared/i18n/dicts/en/settings.ts

@@ -205,6 +205,8 @@ const settings: Record<string, string> = {
   'settings.highlight.importEmpty': 'No usable rules found',
   'settings.highlight.importBadJson': 'Not valid JSON',
   'settings.highlight.importWrongKind': 'This JSON is not a highlight-rule file',
+  'settings.highlight.importWrongVersion': 'This JSON has an unsupported version',
+  'settings.highlight.importReadFailed': 'Could not read the file',
   'settings.highlight.importSkipped': 'Skipped {n}: {list}',
   'settings.highlight.imported': 'Imported {n} rule(s)',
   'settings.highlight.testText': 'Test text',
@@ -268,6 +270,7 @@ const settings: Record<string, string> = {
   'settings.highlight.builtin.loglevel': 'Log levels',
   'settings.highlight.builtin.rootat': 'Root prompt (root@)',
   'settings.highlight.builtin.exitcode': 'Exit codes',
+  'settings.highlight.builtin.percent': 'Percentages & progress',
   'settings.highlight.builtin.http': 'HTTP status codes',
   'settings.highlight.builtin.latency': 'Durations (milliseconds)',
   'settings.highlight.builtin.delop': 'Delete / move / overwrite operations',