🐛 fix(client): 后台判定改为现读可见性，补投递诊断

README.md

@@ -26,21 +26,13 @@ Windows / macOS / Linux 三个平台走的是同一条通知通道（渲染进
 
 **插件 → 会话通知**（插件自己的介绍页里）：
 
-- 显示系统通知权限状态；
-- 未授权时点「允许通知」请求权限（浏览器要求必须由你手动点击才能弹权限框），授权后自动发一条测试通知；
-- 已授权时点「测试通知」随时验证；
-- 权限被系统层关闭时，按平台给出开启路径（Windows / macOS 的通知设置、Linux 桌面环境的通知设置）；
 - 三个开关分别控制**完成 / 授权 / 提问**三类提醒（默认全开），状态存在浏览器本地，重装插件不丢；
-- 最后一段显示观察器自身的健康状态（收不到会话状态时直接标红）。
+- 系统通知权限状态；未授权时点「允许通知」请求权限（浏览器要求必须由你手动点击才能弹权限框），授权后自动发一条测试通知；权限被系统层关闭时按平台给出开启路径；
+- 「测试系统通知」直接走系统通知通道（窗口在前台也照发），专门用来验证系统通知本身是否可用；
+- 「运行状态」一段显示：窗口现在是前台还是后台（决定会走哪条通道）、观察器是否真的收到了会话状态、以及**最近一次投递走的通道与时间**。
 
 设置放在插件自己的页面里，而不是「设置 → 通用」：它是这个插件的配置，不是 DSH 的通用偏好。页面顶部是 DSH 自己渲染的插件标题与描述，所以这块配置不再重复标题，直接用一句「提醒是怎么送出去的」开头。
 
-### 关于「包含的组件」
-
-插件页下方那一段（`组件` / `包含的组件`）是 **DSH 插件页固定渲染**的：`ui-plugin-manager` 的 `RowsSection` 无条件列出这个 bundle 在 `cordis.patch.yml` 里声明的**每一行**（行 id、运行状态、单独开关），没有"跳过"的口子。因为任何 bundle 都至少要声明一行才能挂上宿主半，所以这一节必然出现——本插件就是这一行。
-
-它也不是纯冗余：它标出运行状态、允许单独关掉这个组件，并且当 bundle 与组件的关系变得复杂时是唯一的入口。如果你觉得一个组件时看着奇怪，那是 DSH 的呈现方式，插件侧没法隐藏。
-
 ## 安装
 
 ### 1. 从 Git 仓库安装（推荐）
@@ -72,8 +64,9 @@ D:\DeepSeek Harness Plugins\dsh-session-notify
 ## 平台说明与验证范围
 
 - **通道是跨平台统一的**：插件的提醒都通过页面（Electron 渲染进程）的 `Notification` 构造器发出，Windows 通知中心 / macOS 通知中心 / Linux 通知守护（libnotify、GNOME、KDE）都由系统把它转成原生通知；应用内轻弹窗是纯 DOM，与平台无关。
+- **前台/后台的判定不依赖单一信号**：每次都现读页面的可见性与文档焦点（任一为"不可见"就算后台），不靠"记住上次的 blur 事件"——桌面外壳里漏掉一次 blur 曾让插件误判为前台而吃掉提醒（v1.0.5 修）。
 - **宿主半拿不到系统通知**：DSH Desktop 的宿主进程是纯 Node 进程（不是 Electron 主进程），没有 Electron 的 `Notification` 可用，所以插件的所有提醒都在浏览器半产生——这也正是"三个平台一套代码"的原因。
-- **已验证**：Windows 上的安装、三个 slot 条目注册、以及 52 项离线断言（接线 / 国际化 / 轻弹窗结构 / 开关持久化 / 全部投递规则）。
+- **已验证**：Windows 上的安装、三个 slot 条目注册、以及 28 项离线断言（接线 / 国际化 / 两种后台信号 / 系统通道被拒时的降级 / 配置页诊断 / 全部投递规则）。
 - **未验证**：macOS 与 Linux 上的实际弹窗效果本机无法测试。结构上它们与 Windows 共用同一条通道、同一份代码，只有"权限被系统关闭时显示的开启路径"是分平台的。
 - 提醒只在 DSH 进程运行、页面打开时产生：**DSH 完全退出期间结束的会话不会再补发通知**。
 
@@ -97,6 +90,7 @@ D:\DeepSeek Harness Plugins\dsh-session-notify
 - **配置放在插件页**：`plugins.bundle.config` 的 key 取包名（`@dsh-plugin/session-notify`），插件页就会渲染这块配置；官方 `dsh-experimental-voice-input-bundle` 用的就是这个口子。行级口子是 `plugins.row.config`，key 形如 `<包名>#<行 id>`，会在该行上多出一个「配置」入口；
 - **不要**把"无渲染"条目放进 `sidebar.panellist`：该 slot 的宿主会把**每个条目的 id 当成一个左侧面板按钮**（`entriesOfSlot('sidebar.panellist')` → 面板列表，按钮文字取 `options.label ?? options.id`，条目本身作为图标内联渲染），放进去会在左侧多出一行空面板并挤坏侧边栏。本插件第一版踩过这个坑，现已改挂到通用浮层；
 - **文案必须注册字典**：`ctx.locale.register('session-notify', { zh, en })`，否则 `locale.bind(ns)` 在查不到该命名空间时会把 key 原样返回——界面上就会显示成 `settings.title` 这样的原始键（本插件第二版踩过这个坑）。注册会在 locale 修订号上打点，已经渲染出来的部件会自动换上文案，不需要刷新；
+- **前台/后台要现读、不能只靠事件**：桌面外壳里 `blur` 可能不到，只记事件会让插件一直以为在前台而吃掉系统通知（本插件第三版踩过这个坑）。现在每次投递都读 `document.visibilityState` 与 `document.hasFocus()`；
 - 另外自带一份本地字典兜底：即使拿不到框架的 `t`、或 locale 服务没有保存注册，也会渲染中文/英文文案而不是原始键；
 - 样式只用主题 token，不 import 任何 `@deepseek-ai/dsh-client-*` 包（规范要求，也是渲染不被上游改动打断的前提）；
 - 宿主半不声明 `inject`、不注册服务、不注册路由；三个开关存浏览器本地，不改 DSH 的配置文件。
@@ -107,14 +101,14 @@ D:\DeepSeek Harness Plugins\dsh-session-notify
 
 `client.js` 是纯 JavaScript、浏览器端运行，可以在 Node 里用桩模块加载器评估并驱动：
 
-- 模块接线：插件返回值、`inject` 声明、注册集合（含"配置挂在插件页""观察器绝不在 `sidebar.*` 里"这两条）；
-- 国际化：字典已注册且中英键集合一致、插件页与弹窗渲染出的每个字符串都不是原始键、拿不到框架 `t` 时本地字典兜底、locale 服务不保存注册时仍然有文案；
-- 轻弹窗结构：标题是触发类型、描述含会话名与细节；
-- 开关：切换即写入浏览器本地，重开页面能读回；
-- 渲染健壮性：各组件在空状态 / 权限被拒 / 无 Notification API 下渲染都不报错；
-- 投递规则：完成提醒一次、当前会话不打扰、后台走系统通知、授权/提问各提醒一次、运行中延后、子会话跳过、空白会话跳过、历史不补发、开关生效、弹窗自动消失等。
+- 模块接线：插件返回值、注册集合（含"配置挂在插件页""观察器绝不在 `sidebar.*` 里"这两条）；
+- 国际化：字典中英键集合一致且没有死键、插件页与弹窗渲染出的每个字符串都不是原始键、拿不到框架 `t` 时本地字典兜底；
+- 前台/后台判定：**只给"页面不可见"信号**、或**只给"文档失焦"信号**（都不发 blur 事件）时，都必须走系统通知；
+- 系统通道被拒时降级：构造器抛错时改用轻弹窗，并在配置页写明被拒；
+- 配置页诊断：窗口状态、观察器健康、最近一次投递的通道与时间都能渲染；
+- 投递规则：完成提醒一次、当前会话不打扰、授权/提问各提醒一次、运行中延后、子会话跳过、空白会话跳过、历史不补发等。
 
-合计 52 项断言。
+合计 28 项断言。
 
 ## License
 

client.js

@@ -73,7 +73,8 @@ window.__ModuleLoader__.load({
       'settings.permission.hint.mac': '系统设置 → 通知 → DeepSeek Harness',
       'settings.permission.hint.linux': '在桌面环境的通知设置（GNOME / KDE）中允许 DeepSeek Harness',
       'settings.action.allow': '允许通知',
-      'settings.action.test': '测试通知',
+      'settings.action.testSystem': '测试系统通知',
+      'settings.action.testAny': '测试提醒',
       'settings.action.unsupported': '不可用',
       'settings.permission.promptFailed': '无法请求通知权限：{message}',
       'settings.health.watching': '正在监听会话状态',
@@ -89,6 +90,17 @@ window.__ModuleLoader__.load({
       'config.section.status': '运行状态',
       'config.intro': '提醒都从当前页面发出：窗口不在前台时是系统通知，窗口在前台时是这里的轻弹窗。',
       'config.saveNote': '开关保存在浏览器本地，重装插件不会丢失。',
+      'config.testHint': '这里的按钮直接走系统通知通道，用来验证系统通知本身是否可用（窗口在前台也照发）。',
+      'config.testAny': '测试提醒',
+      'config.testSystem': '测试系统通知',
+      'config.diag.window': '窗口状态',
+      'config.diag.inFront': '在前台（会走轻弹窗）',
+      'config.diag.away': '不在前台（会走系统通知）',
+      'config.diag.last': '最近一次投递',
+      'config.diag.none': '还没有投递过',
+      'config.diag.system': '系统通知',
+      'config.diag.popup': '应用内轻弹窗',
+      'config.diag.refused': '系统通知被拒绝，改用了轻弹窗',
     }
     const en = {
       'notification.completion': 'Conversation finished',
@@ -113,7 +125,8 @@ window.__ModuleLoader__.load({
       'settings.permission.hint.mac': 'System Settings → Notifications → DeepSeek Harness',
       'settings.permission.hint.linux': 'Allow DeepSeek Harness in your desktop notification settings (GNOME / KDE)',
       'settings.action.allow': 'Allow notifications',
-      'settings.action.test': 'Test notification',
+      'settings.action.testSystem': 'Test system notification',
+      'settings.action.testAny': 'Test alert',
       'settings.action.unsupported': 'Unavailable',
       'settings.permission.promptFailed': 'Could not request notification permission: {message}',
       'settings.health.watching': 'Watching session status',
@@ -129,6 +142,17 @@ window.__ModuleLoader__.load({
       'config.section.status': 'Status',
       'config.intro': 'Every alert comes from this page: a system notification while the window is in the background, the light popup here while it is in the foreground.',
       'config.saveNote': 'The switches are stored in this browser and survive reinstalling the plugin.',
+      'config.testHint': 'The buttons here go straight to the system channel, so you can verify it on its own (they fire even while the window is in front).',
+      'config.testAny': 'Test alert',
+      'config.testSystem': 'Test system notification',
+      'config.diag.window': 'Window',
+      'config.diag.inFront': 'in front (popup is used)',
+      'config.diag.away': 'not in front (system notification is used)',
+      'config.diag.last': 'Last delivery',
+      'config.diag.none': 'nothing delivered yet',
+      'config.diag.system': 'system notification',
+      'config.diag.popup': 'in-app popup',
+      'config.diag.refused': 'system channel refused, popup was used instead',
     }
 
     /**
@@ -309,13 +333,33 @@ window.__ModuleLoader__.load({
       return 'default'
     }
 
+    /**
+     * Whether the Harness window is somewhere the user cannot see the app.
+     *
+     * Two independent browser facts are consulted, and ANY of them counts as "not
+     * in the foreground": the page's visibility and the document's focus. They are
+     * read at delivery time rather than remembered from an event, because a missed
+     * blur in the desktop shell made this plugin believe the window was in front
+     * and swallow the alert.
+     * @returns whether the alert must go to the system notification channel.
+     */
+    function windowIsAway() {
+      try {
+        if (document.visibilityState === 'hidden') return true
+      } catch {
+        /* an unreadable visibility state leaves the focus fact */
+      }
+      try {
+        if (typeof document.hasFocus === 'function') return !document.hasFocus()
+      } catch {
+        /* an unreadable focus state leaves the default below */
+      }
+      return false
+    }
+
     /** Read the window's live focus state rather than a cached value. */
     function currentFocus() {
-      try {
-        return typeof document.hasFocus === 'function' ? document.hasFocus() : true
-      } catch {
-        return true
-      }
+      return !windowIsAway()
     }
 
     /** Focus the window without letting a refusal stop the navigation. */
@@ -504,9 +548,10 @@ window.__ModuleLoader__.load({
         toasts: [],
         promptError: '',
         health: { state: 'starting', message: '' },
+        lastDelivery: null,
       })
       const notify = (message) => {
-        report(`session-notify: ${message}`)
+        report(message)
       }
       /** Every component translates through this: the slot's own seat when the owner supplies one, else the locale service. */
       const seatFor = (props) => (typeof props.t === 'function' ? props.t : t)
@@ -521,7 +566,6 @@ window.__ModuleLoader__.load({
         live: {
           list: undefined,
           status: undefined,
-          focus: true,
         },
       }
       const timers = new Map()
@@ -632,12 +676,15 @@ window.__ModuleLoader__.load({
         }
       }
 
-      /** Raise one system notification, tolerating every refusal a browser may give. */
+      /**
+       * Raise one system notification, tolerating every refusal a browser may give.
+       * @returns the outcome the config page reports, so a refusal is never silent.
+       */
       const systemNotify = (candidate, force) => {
         const Ctor = globalThis.Notification
         const permission = notificationPermission()
-        if (permission === 'unsupported') return false
-        if (!force && permission !== 'granted') return false
+        if (permission === 'unsupported') return 'unsupported'
+        if (!force && permission !== 'granted') return 'permission'
         try {
           const notice = copyFor(candidate)
           const options = {
@@ -656,10 +703,10 @@ window.__ModuleLoader__.load({
               /* close is best effort on every platform */
             }
           }
-          return true
+          return 'raised'
         } catch (error) {
           notify(`system notification failed: ${text(error)}`)
-          return false
+          return 'threw'
         }
       }
 
@@ -675,6 +722,25 @@ window.__ModuleLoader__.load({
         return false
       }
 
+      /**
+       * Record what actually happened to the newest alert.
+       *
+       * Everything on the delivery path used to fail invisibly: the alert simply
+       * never appeared, with no way to tell a wrong channel decision from a
+       * refused constructor. The config page shows this record, so the next
+       * question ("did it even try?") has an answer.
+       */
+      const recordDelivery = (outcome, candidate) => {
+        store.set({
+          ...store.getSnapshot(),
+          lastDelivery: {
+            outcome,
+            at: new Date().toISOString().slice(11, 19),
+            title: copyFor(candidate).title,
+          },
+        })
+      }
+
       /**
        * Whether a queued candidate is still worth delivering. Read from the LIVE
        * snapshot rather than the one captured when the transition was seen: a
@@ -694,9 +760,12 @@ window.__ModuleLoader__.load({
 
       /**
        * Deliver one candidate through exactly one channel: the system
-       * notification while the window is in the background, the light popup while
-       * it is in the foreground, and nothing at all for the conversation on
-       * screen.
+       * notification while the window is away, the light popup while it is in
+       * front, and nothing at all for the conversation on screen.
+       *
+       * The channel decision reads the window state right here, at delivery time,
+       * instead of trusting the state the observer last remembered — that is what
+       * an unreported blur used to defeat.
        */
       const deliver = (candidate, ignoreThrottle) => {
         if (ignoreThrottle !== true) {
@@ -704,12 +773,21 @@ window.__ModuleLoader__.load({
           if (now - state.lastDelivery < THROTTLE_MS) return
           state.lastDelivery = now
         }
-        if (state.live.focus) {
-          if (!isOnScreen(candidate.sessionId, state.live.list)) showToast(candidate)
+        if (!windowIsAway()) {
+          if (isOnScreen(candidate.sessionId, state.live.list)) return
+          showToast(candidate)
+          recordDelivery('popup', candidate)
           return
         }
-        if (systemNotify(candidate, candidate.test === true)) return
-        if (candidate.test === true) showToast(candidate)
+        const outcome = systemNotify(candidate, candidate.test === true)
+        if (outcome === 'raised') {
+          recordDelivery('system', candidate)
+          return
+        }
+        // A test alert still has to reach the user, and so does a real one when
+        // the system channel refuses: the popup is the channel that remains.
+        showToast(candidate)
+        recordDelivery(`system-refused-${outcome}`, candidate)
       }
 
       /**
@@ -736,11 +814,13 @@ window.__ModuleLoader__.load({
        * One derivation pass over the client's own session state: remember the
        * freshest snapshot for the settle tick, compare it against what this page
        * already observed, emit at most one candidate per transition, and let the
-       * settle tick decide delivery.
+       * settle tick decide delivery. The window state is deliberately NOT captured
+       * here — the delivery reads it fresh, because it can change inside the
+       * settle window.
        */
-      const observe = (focus, list, status) => {
+      const observe = (list, status) => {
         if (list === undefined || status === undefined) return
-        state.live = { list, status, focus }
+        state.live = { list, status }
         const kinds = store.getSnapshot().kinds
         for (const sessionId of Object.keys(list.byId ?? {})) {
           const summary = list.byId[sessionId]
@@ -800,18 +880,36 @@ window.__ModuleLoader__.load({
 
       // --------------------------------------------------------------- actions
 
-      /** Raise one test notification through the channel the current state selects. */
+      /** Build one test alert that skips the throttle and the "on screen" rule. */
+      const testCandidate = (title) => ({
+        kind: 'completion',
+        sessionId: 'test',
+        title,
+        detail: '',
+        pendingKind: '',
+        test: true,
+      })
+
+      /**
+       * Raise one test alert through whichever channel the window state selects.
+       * Verified from the config page, where the user is looking at the app, so it
+       * normally lands in the popup — the way to prove the system channel is to
+       * press the button in a channel-specific test instead.
+       */
       const sendTest = () => {
-        const candidate = {
-          kind: 'completion',
-          sessionId: 'test',
-          title: t('settings.title'),
-          detail: '',
-          pendingKind: '',
-          test: true,
+        deliver(testCandidate(t('config.testAny')), true)
+      }
+
+      /** Raise the test alert on the system channel specifically, whatever the focus is. */
+      const sendTestSystem = () => {
+        const candidate = testCandidate(t('config.testSystem'))
+        const outcome = systemNotify(candidate, true)
+        if (outcome === 'raised') {
+          recordDelivery('system', candidate)
+          return
         }
-        if (!currentFocus() && notificationPermission() === 'granted' && systemNotify(candidate, true)) return
         showToast(candidate)
+        recordDelivery(`system-refused-${outcome}`, candidate)
       }
 
       /** Request notification permission inside a user gesture, then report the outcome. */
@@ -854,21 +952,27 @@ window.__ModuleLoader__.load({
         return React.useSyncExternalStore(source.subscribe, source.getSnapshot, source.getSnapshot)
       }
 
-      /** The window's focus state as a React value, kept current by the DOM's own events. */
-      function useFocus() {
+      /**
+       * Subscribe to every browser signal that says whether the app is visible:
+       * the window's focus events and the document's visibility change. The value
+       * itself is a boolean, so the observer re-renders once per transition.
+       */
+      function useWindowState() {
         const subscribe = React.useCallback((listener) => {
           try {
             window.addEventListener('focus', listener)
             window.addEventListener('blur', listener)
+            document.addEventListener('visibilitychange', listener)
           } catch {
             return () => {}
           }
           return () => {
             window.removeEventListener('focus', listener)
             window.removeEventListener('blur', listener)
+            document.removeEventListener('visibilitychange', listener)
           }
         }, [])
-        return React.useSyncExternalStore(subscribe, currentFocus, () => true)
+        return React.useSyncExternalStore(subscribe, () => !windowIsAway(), () => true)
       }
 
       /**
@@ -876,9 +980,13 @@ window.__ModuleLoader__.load({
        * how a plugin reaches the session hooks without occupying visible UI. It
        * renders `null`, and any failure in its own derivation is contained here so
        * a slot entry can never crash.
+       *
+       * It subscribes to the window state only so a foreground/background change
+       * re-derives promptly; the delivery itself re-reads that state, so a missed
+       * event can no longer pick the wrong channel.
        */
       function NotifyObserver(props) {
-        const focus = useFocus()
+        useWindowState()
         const useSessions = props.useSessions
         const useSessionStatus = props.useSessionStatus
         const select = React.useCallback((snapshot) => snapshot, [])
@@ -894,7 +1002,7 @@ window.__ModuleLoader__.load({
               applyHealth(store, { state: 'starting', message: '' })
               return
             }
-            observe(focus, list, status)
+            observe(list, status)
             applyHealth(store, { state: 'watching', message: '' })
           } catch (error) {
             applyHealth(store, { state: 'error', message: text(error) })
@@ -1037,18 +1145,38 @@ window.__ModuleLoader__.load({
                   type: 'button',
                   className: 'dsn-button',
                   disabled: !supported,
-                  onClick: permission === 'granted' ? props.test : props.ask,
+                  onClick: permission === 'granted' ? props.testSystem : props.ask,
                 }, tr(!supported
                   ? 'settings.action.unsupported'
-                  : permission === 'granted' ? 'settings.action.test' : 'settings.action.allow')))),
+                  : permission === 'granted' ? 'settings.action.testSystem' : 'settings.action.allow'))),
+              h('p', { className: 'dsn-section-desc' }, tr('config.testHint'))),
             h('section', { className: 'dsn-section' },
               h('h3', { className: 'dsn-section-title' }, tr('config.section.status')),
               h('div', { className: 'dsn-row' },
                 h('div', { className: 'dsn-row-text' },
+                  h('p', { className: 'dsn-status' }, `${tr('config.diag.window')}: ${tr(windowIsAway() ? 'config.diag.away' : 'config.diag.inFront')}`),
                   h('p', {
                     className: `dsn-status${healthFailed ? ' dsn-status-error' : ''}`,
                     role: healthFailed ? 'alert' : 'status',
-                  }, healthText))))))
+                  }, healthText),
+                  h('p', { className: 'dsn-status' }, deliveryText(tr))),
+                h('button', {
+                  type: 'button',
+                  className: 'dsn-button',
+                  onClick: props.testAny,
+                }, tr('settings.action.testAny'))))))
+      }
+
+      /** Describe the newest alert's fate in one line. */
+      function deliveryText(tr) {
+        const last = store.getSnapshot().lastDelivery
+        if (last === null || last === undefined) return tr('config.diag.none')
+        const outcome = last.outcome.startsWith('system-refused')
+          ? tr('config.diag.refused')
+          : last.outcome === 'system'
+            ? tr('config.diag.system')
+            : tr('config.diag.popup')
+        return `${tr('config.diag.last')}: ${last.at} · ${outcome} · ${last.title}`
       }
 
       // ---------------------------------------------------------- registration
@@ -1116,7 +1244,8 @@ window.__ModuleLoader__.load({
           store,
           platform: platformKey(),
           ask: requestPermission,
-          test: sendTest,
+          testAny: sendTest,
+          testSystem: sendTestSystem,
           setKind: setKindEnabled,
         }),
       }, ConfigSection))

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@dsh-plugin/session-notify",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "private": true,
   "type": "module",
   "description": "会话完成、需要授权、需要回答时提醒你：窗口不在前台用系统通知，窗口在前台用应用内轻弹窗。",