feat: 客户端灵动岛 + 上课时段紧急通知二次确认，并修复打包/校验脚本在 Electron 宿主下的多个缺陷

## 客户端灵动岛（动态岛）

- 新增独立透明置顶窗口：桌面中上方常驻、不占任务栏、不抢焦点（268x44 胶囊 / 404x316 详情 / 424x344 紧急）
- 三种形态与动画：隐藏 ↔ 胶囊 ↔ 详情，尺寸用 easeOutCubic 260ms 逐帧缓动、透明度单独淡入淡出
  （尺寸与淡入使用各自动画令牌，避免互相打断导致窗口卡在胶囊尺寸）
- 行为：普通通知变「新消息 · 共 N 条」胶囊，点击展开详情；上课时段自动隐藏并进入待发队列，
  下课后自动弹出；紧急通知无论是否上课立即展开（红色呼吸光晕 + 紧急角标，无需点击）
- 上课状态来自 GET /api/schedules/current（10s 心跳 + 下课时长定时器），
  新增 src/main/island.ts（控制器/IPC）、src/preload/island.ts、src/island/IslandApp.vue、
  src/renderer/island/bridge.ts、island.html 与多页 Vite 构建

## 上课时段发布紧急通知的二次确认

- 服务端：priority=URGENT 且当前处于上课时间段且未带 confirmDuringClass 时返回
  409 URGENT_DURING_CLASS（携带 current/next/week/serverTime），绕过界面调接口同样被拦截
- 新增 GET /api/schedules/current（inClass/current/next，at 参数用于诊断与测试）
- Web 管理端：全屏警告遮罩（UrgentClassWarning.vue），显示正在上的课时段与待发布标题，
  确认按钮带 3 秒倒计时（圆环进度，倒计时结束前禁用），取消即不发；并发命中 409 同样兜底弹窗

## 打包与验证脚本修复（Electron 宿主环境）

- scripts/lib/node-runtime.mjs：定位真正的 node.exe。此前经 pnpm 运行时 process.execPath 指向
  Electron，dist:server 会把 Electron 复制成安装包内的 node.exe，dist:win 会让 electron-builder 报
  Unknown argument: .../cli.js（改为显式使用真实 Node）
- scripts/lib/electron-env.mjs：启动 Electron 前清理继承的 ELECTRON_RUN_AS_NODE（否则 Electron 退化为
  纯 Node，require('electron') 直接 MODULE_NOT_FOUND），并从 path.txt 定位 electron.exe
  （process.versions.electron 存在时 import 'electron' 返回的是 API 对象而非路径）
- scripts/dist-server.mjs：新增构建产物新鲜度校验（曾出现 server 已重建但打进安装包的 shared/dist 是旧的，
  安装后服务启动即报 does not provide an export named MAX_TERM_WEEK）
- scripts/ui-smoke：新增 live-probe.mjs 真实制造/清理上课时段，Electron 驱动真实点击断言全屏警告文案、
  按钮禁用与 3 秒倒计时时长（实测 2966ms），测试后自动删除探针课表与测试通知

## 验证结果

- pnpm verify:e2e 62/62（新增上课时段拦截、二次确认后发布、普通通知不受限等 8 项）
- pnpm verify:web 8/8（新增上课时段紧急通知全屏警告 + 倒计时）
- pnpm verify:desktop 18/18（新增灵动岛窗口/上课隐藏/下课弹出/紧急立即展开/胶囊点击展开 + 截图）
- 打包后 EXE 冒烟 15/15（packaged: true，退出码 0）
- 服务端安装程序升级安装：.env 与数据库保持不变，/api/schedules/current 正常
- pnpm lint / format:check / typecheck 全部通过

packages/desktop-client/src/island/IslandApp.vue

@@ -0,0 +1,600 @@
+<script setup lang="ts">
+import { computed, onMounted, ref } from 'vue';
+import { PRIORITY_LABELS, formatDate, type IslandNotification, type IslandState } from '@classhelper/shared';
+
+/**
+ * 灵动岛渲染进程。
+ *
+ * 窗口尺寸由主进程按状态缓动（见 src/main/island.ts），这里只负责：
+ * - 按状态渲染 胶囊 / 展开卡片
+ * - 内容交叉淡入与弹簧缩放（形变动画的"内容层"）
+ * - 把用户点击（展开 / 收起 / 标为已读 / 打开应用）回传主进程
+ */
+const state = ref<IslandState>({
+  mode: 'hidden',
+  active: null,
+  queued: [],
+  inClass: false,
+  currentPeriodEnd: null,
+  reason: null,
+  updatedAt: 0,
+});
+
+const bridge = window.island;
+
+const notification = computed<IslandNotification | null>(() => state.value.active);
+const mode = computed(() => state.value.mode);
+const isUrgent = computed(() => notification.value?.priority === 'URGENT');
+const queueCount = computed(() => state.value.queued.length);
+
+const priorityLabel = computed(() =>
+  notification.value ? (PRIORITY_LABELS[notification.value.priority] ?? notification.value.priority) : '',
+);
+
+const subtitle = computed(() => {
+  if (!notification.value) return '';
+  const teacher = notification.value.teacherName ? `${notification.value.teacherName} · ` : '';
+  return `${teacher}${formatDate(notification.value.createdAt, true)}`;
+});
+
+/** 下课补发时提示"其实上课期间就到了" */
+const showAfterClassHint = computed(() => state.value.reason === 'after-class' && !state.value.inClass);
+
+function expand(): void {
+  bridge?.sendAction('expand');
+}
+
+function collapse(): void {
+  bridge?.sendAction('collapse');
+}
+
+function dismiss(): void {
+  bridge?.sendAction('dismiss');
+}
+
+function markRead(): void {
+  if (notification.value) bridge?.sendAction('mark-read', notification.value.id);
+}
+
+function openApp(): void {
+  bridge?.sendAction('open-app');
+}
+
+onMounted(async () => {
+  bridge?.onState((next) => {
+    state.value = next;
+  });
+  const initial = await bridge?.getState();
+  if (initial) state.value = initial;
+});
+</script>
+
+<template>
+  <div class="island-root">
+    <Transition name="island-pop" :duration="{ enter: 240, leave: 150 }">
+      <!-- 胶囊态：收到通知后先变成"新消息" -->
+      <button
+        v-if="mode === 'pill' && notification"
+        key="pill"
+        type="button"
+        class="island-card pill"
+        :class="{ urgent: isUrgent, 'after-class': showAfterClassHint }"
+        @click="expand"
+      >
+        <span v-if="isUrgent" class="glow" aria-hidden="true"></span>
+        <span class="pulse-dot" :class="{ urgent: isUrgent }"></span>
+        <span class="pill-icon">
+          <svg viewBox="0 0 24 24" width="15" height="15" aria-hidden="true">
+            <path
+              fill="currentColor"
+              d="M12 2a6 6 0 0 0-6 6v3.1L4.6 14a1 1 0 0 0 .9 1.5h13a1 1 0 0 0 .9-1.5L18 11.1V8a6 6 0 0 0-6-6Zm0 20a3 3 0 0 0 3-2.6H9A3 3 0 0 0 12 22Z"
+            />
+          </svg>
+        </span>
+        <span class="pill-text">
+          <span class="pill-title">
+            {{ isUrgent ? '紧急通知' : '新消息' }}
+            <template v-if="queueCount > 0">· 共 {{ queueCount + 1 }} 条</template>
+          </span>
+          <span class="pill-sub">{{ notification.teacherName || '老师' }} · 点击查看</span>
+        </span>
+        <span class="pill-chevron" aria-hidden="true">
+          <svg viewBox="0 0 24 24" width="14" height="14">
+            <path
+              fill="none"
+              stroke="currentColor"
+              stroke-width="2.4"
+              stroke-linecap="round"
+              d="m9 6 6 6-6 6"
+            />
+          </svg>
+        </span>
+      </button>
+
+      <!-- 展开态：显示通知详情 -->
+      <section
+        v-else-if="mode === 'expanded' && notification"
+        key="expanded"
+        class="island-card expanded"
+        :class="{ urgent: isUrgent }"
+      >
+        <span v-if="isUrgent" class="glow" aria-hidden="true"></span>
+        <header class="head">
+          <span class="head-icon" :class="{ urgent: isUrgent }">
+            <svg viewBox="0 0 24 24" width="15" height="15" aria-hidden="true">
+              <path
+                fill="currentColor"
+                d="M12 2a6 6 0 0 0-6 6v3.1L4.6 14a1 1 0 0 0 .9 1.5h13a1 1 0 0 0 .9-1.5L18 11.1V8a6 6 0 0 0-6-6Zm0 20a3 3 0 0 0 3-2.6H9A3 3 0 0 0 12 22Z"
+              />
+            </svg>
+          </span>
+          <div class="head-meta">
+            <span class="badge" :class="`badge-${notification.priority.toLowerCase()}`">
+              {{ priorityLabel }}
+            </span>
+            <span v-if="isUrgent" class="live-dot">需立即查看</span>
+            <span v-else-if="showAfterClassHint" class="live-dot muted">下课后补发</span>
+            <span class="head-sub">{{ subtitle }}</span>
+          </div>
+          <button type="button" class="icon-btn" title="收起" @click="collapse">
+            <svg viewBox="0 0 24 24" width="14" height="14">
+              <path
+                fill="none"
+                stroke="currentColor"
+                stroke-width="2.4"
+                stroke-linecap="round"
+                d="m6 15 6-6 6 6"
+              />
+            </svg>
+          </button>
+        </header>
+
+        <h3 class="title">{{ notification.title }}</h3>
+        <div class="body">
+          <p class="content">{{ notification.content }}</p>
+        </div>
+
+        <footer class="foot">
+          <span v-if="queueCount > 0" class="more">还有 {{ queueCount }} 条通知</span>
+          <span v-else class="more muted">来自班级小助手</span>
+          <span class="actions">
+            <button type="button" class="ghost-btn" @click="openApp">打开应用</button>
+            <button type="button" class="ghost-btn" @click="markRead">标为已读</button>
+            <button type="button" class="solid-btn" @click="dismiss">知道了</button>
+          </span>
+        </footer>
+      </section>
+
+      <!-- 隐藏态占位（窗口不可见，仅保证 DOM 结构稳定） -->
+      <div v-else key="hidden" class="island-card hidden-placeholder"></div>
+    </Transition>
+  </div>
+</template>
+
+<style>
+html,
+body,
+#app {
+  margin: 0;
+  padding: 0;
+  width: 100%;
+  height: 100%;
+  background: transparent;
+  overflow: hidden;
+  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
+  -webkit-user-select: none;
+  user-select: none;
+}
+
+.island-root {
+  position: relative;
+  width: 100%;
+  height: 100%;
+  padding: 2px 4px;
+  box-sizing: border-box;
+}
+
+/* 三态卡片绝对定位，使交叉淡入淡出（并行 Transition）不会互相挤压 */
+.island-card {
+  position: absolute;
+  top: 2px;
+  right: 4px;
+  bottom: 2px;
+  left: 4px;
+  box-sizing: border-box;
+  border-radius: 24px;
+  color: #f7f8fa;
+  border: 1px solid rgba(255, 255, 255, 0.14);
+  background:
+    radial-gradient(120% 140% at 50% -20%, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0) 55%),
+    linear-gradient(180deg, #23242a 0%, #0c0d10 100%);
+  box-shadow:
+    0 12px 28px rgba(0, 0, 0, 0.45),
+    inset 0 1px 0 rgba(255, 255, 255, 0.08);
+  transition:
+    border-color 0.28s ease,
+    box-shadow 0.28s ease,
+    background 0.28s ease;
+}
+
+/* 紧急通知：红色描边 + 独立光晕层呼吸
+   注意：无限动画必须放在内部 .glow 上，否则会让 Vue <Transition> 的
+   transitionend/animationend 判定失效，导致DOM 卡在离场状态。 */
+.island-card.urgent {
+  border-color: rgba(255, 92, 92, 0.55);
+  box-shadow:
+    0 12px 30px rgba(0, 0, 0, 0.5),
+    0 0 0 1px rgba(255, 92, 92, 0.25),
+    inset 0 1px 0 rgba(255, 255, 255, 0.1);
+}
+
+.glow {
+  position: absolute;
+  inset: -1px;
+  border-radius: inherit;
+  pointer-events: none;
+  animation: urgent-breath 2.2s ease-in-out infinite;
+}
+
+@keyframes urgent-breath {
+  0%,
+  100% {
+    box-shadow:
+      0 0 0 1px rgba(255, 92, 92, 0.22),
+      0 0 18px rgba(255, 72, 72, 0.28);
+  }
+  50% {
+    box-shadow:
+      0 0 0 1px rgba(255, 92, 92, 0.38),
+      0 0 34px rgba(255, 72, 72, 0.5);
+  }
+}
+
+/* ---------------------------------------------------------------- 胶囊态 */
+
+.island-card.pill {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 0 12px;
+  border-radius: 22px;
+  cursor: pointer;
+  font: inherit;
+  text-align: left;
+  outline: none;
+  transition:
+    transform 0.18s cubic-bezier(0.34, 1.56, 0.64, 1),
+    background 0.2s ease;
+}
+
+.island-card.pill:hover {
+  transform: translateY(-1px) scale(1.015);
+}
+
+.island-card.pill:active {
+  transform: scale(0.985);
+}
+
+.hidden-placeholder {
+  opacity: 0;
+  cursor: default;
+}
+
+.pulse-dot {
+  position: absolute;
+  top: 9px;
+  left: 14px;
+  width: 7px;
+  height: 7px;
+  border-radius: 50%;
+  background: #4facfe;
+  box-shadow: 0 0 0 0 rgba(79, 172, 254, 0.6);
+  animation: dot-pulse 1.8s ease-out infinite;
+}
+
+.pulse-dot.urgent {
+  background: #ff5c5c;
+  box-shadow: 0 0 0 0 rgba(255, 92, 92, 0.7);
+}
+
+@keyframes dot-pulse {
+  0% {
+    box-shadow: 0 0 0 0 rgba(79, 172, 254, 0.55);
+  }
+  70% {
+    box-shadow: 0 0 0 9px rgba(79, 172, 254, 0);
+  }
+  100% {
+    box-shadow: 0 0 0 0 rgba(79, 172, 254, 0);
+  }
+}
+
+.pill-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 26px;
+  height: 26px;
+  border-radius: 50%;
+  color: #9fd0ff;
+  background: rgba(79, 172, 254, 0.14);
+  flex: 0 0 auto;
+}
+
+.island-card.pill.urgent .pill-icon {
+  color: #ffb3b3;
+  background: rgba(255, 92, 92, 0.18);
+}
+
+.pill-text {
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+  flex: 1;
+  line-height: 1.25;
+}
+
+.pill-title {
+  font-size: 13px;
+  font-weight: 650;
+  letter-spacing: 0.2px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.pill-sub {
+  font-size: 11px;
+  color: rgba(255, 255, 255, 0.55);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.pill-chevron {
+  color: rgba(255, 255, 255, 0.4);
+  flex: 0 0 auto;
+}
+
+/* ---------------------------------------------------------------- 展开态 */
+
+.island-card.expanded {
+  display: flex;
+  flex-direction: column;
+  padding: 12px 14px 12px;
+  border-radius: 24px;
+  gap: 8px;
+}
+
+.head {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.head-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  border-radius: 8px;
+  color: #9fd0ff;
+  background: rgba(79, 172, 254, 0.16);
+  flex: 0 0 auto;
+}
+
+.head-icon.urgent {
+  color: #ffc0c0;
+  background: rgba(255, 92, 92, 0.2);
+}
+
+.head-meta {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  min-width: 0;
+  flex: 1;
+}
+
+.badge {
+  font-size: 10px;
+  padding: 1px 7px;
+  border-radius: 999px;
+  font-weight: 650;
+  letter-spacing: 0.3px;
+}
+
+.badge-urgent {
+  color: #fff;
+  background: #ff4d4f;
+}
+
+.badge-high {
+  color: #3a2a00;
+  background: #ffc53d;
+}
+
+.badge-normal {
+  color: #06263f;
+  background: #6cc4ff;
+}
+
+.badge-low {
+  color: #23262b;
+  background: #c9ced6;
+}
+
+.live-dot {
+  font-size: 10px;
+  color: #ffb3b3;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.live-dot::before {
+  content: '';
+  width: 5px;
+  height: 5px;
+  border-radius: 50%;
+  background: currentColor;
+  animation: dot-pulse 1.6s ease-out infinite;
+}
+
+.live-dot.muted {
+  color: rgba(255, 255, 255, 0.45);
+}
+
+.head-sub {
+  margin-left: auto;
+  font-size: 10px;
+  color: rgba(255, 255, 255, 0.42);
+  white-space: nowrap;
+}
+
+.icon-btn {
+  border: none;
+  background: rgba(255, 255, 255, 0.08);
+  color: rgba(255, 255, 255, 0.7);
+  width: 22px;
+  height: 22px;
+  border-radius: 50%;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  transition:
+    background 0.18s ease,
+    transform 0.18s ease;
+  flex: 0 0 auto;
+}
+
+.icon-btn:hover {
+  background: rgba(255, 255, 255, 0.16);
+  transform: scale(1.06);
+}
+
+.title {
+  margin: 0;
+  font-size: 15px;
+  font-weight: 680;
+  line-height: 1.35;
+  letter-spacing: 0.2px;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
+  overflow: hidden;
+}
+
+.body {
+  flex: 1;
+  min-height: 0;
+  overflow-y: auto;
+  background: rgba(255, 255, 255, 0.045);
+  border-radius: 12px;
+  padding: 9px 11px;
+}
+
+.body::-webkit-scrollbar {
+  width: 5px;
+}
+
+.body::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.18);
+  border-radius: 3px;
+}
+
+.content {
+  margin: 0;
+  font-size: 12.5px;
+  line-height: 1.72;
+  color: rgba(255, 255, 255, 0.82);
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+
+.foot {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+}
+
+.more {
+  font-size: 11px;
+  color: #9fd0ff;
+}
+
+.more.muted {
+  color: rgba(255, 255, 255, 0.38);
+}
+
+.actions {
+  display: inline-flex;
+  gap: 6px;
+}
+
+.ghost-btn,
+.solid-btn {
+  font: inherit;
+  font-size: 11.5px;
+  border-radius: 999px;
+  padding: 4px 11px;
+  cursor: pointer;
+  border: 1px solid transparent;
+  transition:
+    background 0.18s ease,
+    border-color 0.18s ease,
+    transform 0.18s ease;
+}
+
+.ghost-btn {
+  color: rgba(255, 255, 255, 0.78);
+  background: rgba(255, 255, 255, 0.08);
+}
+
+.ghost-btn:hover {
+  background: rgba(255, 255, 255, 0.16);
+  transform: translateY(-1px);
+}
+
+.solid-btn {
+  color: #06263f;
+  background: #6cc4ff;
+  font-weight: 650;
+}
+
+.island-card.expanded.urgent .solid-btn {
+  color: #fff;
+  background: #ff4d4f;
+}
+
+.solid-btn:hover {
+  transform: translateY(-1px);
+}
+
+/* ---------------------------------------------------------------- 形变动画 */
+
+.island-pop-enter-active {
+  transition:
+    opacity 0.22s ease,
+    transform 0.34s cubic-bezier(0.34, 1.56, 0.64, 1);
+}
+
+.island-pop-leave-active {
+  transition:
+    opacity 0.16s ease,
+    transform 0.2s ease;
+}
+
+.island-pop-enter-from {
+  opacity: 0;
+  transform: scale(0.86) translateY(-8px);
+}
+
+.island-pop-leave-to {
+  opacity: 0;
+  transform: scale(0.9);
+}
+</style>

packages/desktop-client/src/island/main.ts

@@ -0,0 +1,15 @@
+import { createApp } from 'vue';
+import IslandApp from './IslandApp.vue';
+
+/**
+ * 灵动岛渲染进程入口。
+ * 刻意不引入 Element Plus 等 UI 库：这个窗口极小、常驻桌面，
+ * 保持零依赖可以让它在低配机器上也瞬间渲染。
+ */
+const app = createApp(IslandApp);
+
+app.config.errorHandler = (error) => {
+  console.error('[island] 渲染异常', error);
+};
+
+app.mount('#app');