feat(highlight): preset overhaul, categories, stats, theme colours, per-host profiles

Rules & engine:
- 22 presets (was 11): split status into okstate/warnstate/badstate, add delop,
  createop, danger, secret, level, exitcode, percent, http; status words are
  case-insensitive and cover the ✓ ✔ ✅ ✗ ✘ ✖ ❌ ⚠ symbol set
- value bands: the first number in a match picks the colour
  (percent: <20% red / 20-50% yellow / 50-80% light green / >=80% green)
- optional per-rule `caseInsensitive`, `category`, `bands`; load-time
  `refreshBuiltinRules` upgrades untouched built-in patterns in place

Settings page:
- three-way master switch `highlightMode` (all / basic / off); `basic` runs only
  the five safety+status rules and `off` empties the rule set rather than
  bypassing HighlightStream (which would drop the held tail)
- category column + grouping (`highlightGroupByCategory`), per-rule hit/duration
  stats (`highlightStats`, opt-in sink, snapshot once a second), theme-following
  colours (`highlightThemeColors`, hue-bucket mapping onto the ANSI palette),
  import/export JSON envelope, live preview through the real engine
- named rule subsets bound per host (`highlightPerHost` + `highlightProfiles`
  + `SshConnection.highlightProfileId`); empty ruleIds = every rule

Tests: new tests/hl-rules.mjs (word boundaries, case flag, negative words,
bands, import/export, preview, basic mode, categories, stats, theme colours,
profiles) + profile round-trip in tests/settings-store.mjs

src/shared/i18n/dicts/zh-CN/settings.ts

@@ -111,6 +111,66 @@ const settings: Record<string, string> = {
   'settings.highlight.palette': '色板',
   'settings.highlight.note': '备注',
   'settings.highlight.notePlaceholder': '规则说明（可选）',
+  'settings.highlight.caseInsensitive': '忽略大小写',
+  'settings.highlight.caseInsensitiveHint': '字母不区分大小写（OK 也能匹配 ok）',
+  'settings.highlight.bands': '数值分级',
+  'settings.highlight.bandsHint': '按匹配到的第一个数字取色；没有数字或低于最小分级时用前景色',
+  'settings.highlight.bandMin': '下限',
+  'settings.highlight.addBand': '+ 添加分级',
+  'settings.highlight.removeBand': '删除分级',
+  'settings.highlight.importExport': '导入 / 导出',
+  'settings.highlight.importExportTitle': '导入 / 导出高亮规则',
+  'settings.highlight.exportSection': '导出（复制或保存下面的 JSON 分享给别人）',
+  'settings.highlight.copy': '复制',
+  'settings.highlight.copied': '已复制',
+  'settings.highlight.download': '保存为文件',
+  'settings.highlight.importSection': '导入（粘贴 JSON，或选择 .json 文件）',
+  'settings.highlight.chooseFile': '选择文件',
+  'settings.highlight.importMode': '导入方式',
+  'settings.highlight.importReplace': '替换现有规则',
+  'settings.highlight.importAppend': '追加到现有规则',
+  'settings.highlight.importOk': '导入',
+  'settings.highlight.importEmpty': '没有解析到可用规则',
+  'settings.highlight.importBadJson': '不是有效的 JSON',
+  'settings.highlight.importWrongKind': '这份 JSON 不是高亮规则文件',
+  'settings.highlight.importSkipped': '已跳过 {n} 条：{list}',
+  'settings.highlight.imported': '已导入 {n} 条规则',
+  'settings.highlight.testText': '测试文本',
+  'settings.highlight.testHint': '改完正则立刻看到效果（仅预览前 2000 字符）',
+  'settings.highlight.mode': '高亮模式',
+  'settings.highlight.modeAll': '全部',
+  'settings.highlight.modeBasic': '仅基础',
+  'settings.highlight.modeOff': '关闭',
+  'settings.highlight.modeDesc': '仅基础：只保留错误/成功/警告/危险命令/密钥等关键规则，开销更小；关闭：完全不注入颜色（规则与颜色都保留）',
+  'settings.highlight.category': '分类',
+  'settings.highlight.groupByCategory': '按分类分组',
+  'settings.highlight.category.safety': '安全',
+  'settings.highlight.category.status': '状态',
+  'settings.highlight.category.file': '文件',
+  'settings.highlight.category.net': '网络',
+  'settings.highlight.category.text': '文本',
+  'settings.highlight.category.metric': '数值',
+  'settings.highlight.category.none': '未分类',
+  'settings.highlight.stats': '统计命中与耗时',
+  'settings.highlight.statsHint': '开启后统计每条规则的命中次数与耗时（设置页显示，关闭时零开销）',
+  'settings.highlight.statsHits': '命中',
+  'settings.highlight.statsMs': '耗时',
+  'settings.highlight.statsReset': '重置统计',
+  'settings.highlight.statsEmpty': '还没有统计数据，先去终端里跑点输出',
+  'settings.highlight.themeColors': '跟随主题配色',
+  'settings.highlight.themeColorsHint': '按色相把高亮颜色映射到当前终端主题的调色板（灰阶色保持原样）',
+  'settings.highlight.perHost': '按主机规则集',
+  'settings.highlight.perHostHint': '开启后，绑定了规则集的 SSH 连接只跑该子集；关闭时所有会话都用全部规则',
+  'settings.highlight.profiles': '主机规则集',
+  'settings.highlight.profilesHint': '把规则的子集存成命名规则集，在「连接编辑」里绑定给某台主机',
+  'settings.highlight.profileNew': '+ 新建规则集',
+  'settings.highlight.profileEdit': '编辑规则集',
+  'settings.highlight.profileName': '名称',
+  'settings.highlight.profileNamePlaceholder': '例如：生产机（只看错误）',
+  'settings.highlight.profileRules': '包含的规则',
+  'settings.highlight.profileRulesHint': '未勾选的规则在这台主机上不生效',
+  'settings.highlight.profileEmpty': '尚未创建规则集',
+  'settings.highlight.profileDeleteTitle': '删除规则集',
   'settings.highlight.actions': '操作',
   'settings.highlight.addRule': '+ 新增规则',
   'settings.highlight.empty': '暂无高亮规则，点击「+ 新增规则」创建',
@@ -123,8 +183,18 @@ const settings: Record<string, string> = {
   'settings.highlight.builtin.perm': 'Linux 权限与用户',
   'settings.highlight.builtin.path': 'Linux 文件路径',
   'settings.highlight.builtin.shellkw': 'Shell 关键字与流程',
+  'settings.highlight.builtin.danger': '危险/破坏性命令',
+  'settings.highlight.builtin.secret': '疑似密钥/令牌',
+  'settings.highlight.builtin.loglevel': '日志级别',
+  'settings.highlight.builtin.rootat': '管理员提示符 root@',
+  'settings.highlight.builtin.exitcode': '退出码',
+  'settings.highlight.builtin.http': 'HTTP 状态码',
+  'settings.highlight.builtin.latency': '耗时（毫秒）',
+  'settings.highlight.builtin.delop': '删除/移动/覆盖操作',
+  'settings.highlight.builtin.createop': '新建/创建操作',
   'settings.highlight.builtin.okstate': '成功状态',
-  'settings.highlight.builtin.badstate': '错误/警告状态',
+  'settings.highlight.builtin.warnstate': '警告与待办标记',
+  'settings.highlight.builtin.badstate': '错误/失败状态',
   'settings.highlight.builtin.quoted': '字符串与引号',
   'settings.highlight.builtin.envvar': '环境变量与参数',
   'settings.highlight.builtin.ipv4': '网络与 IP 地址',