docs: add implementation plan for merging print/export buttons

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/superpowers/plans/2026-06-22-merge-print-export-buttons.md

@@ -0,0 +1,662 @@
+# Merge Print/Export Buttons Into Dropdown Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Replace the two separate "打印整册" / "导出 MD" toolbar buttons with a single "导出 ▾" button that opens a dropdown menu offering both actions, and extract the dropdown logic that's now used by two buttons into a shared `ToolbarMenuButton.vue` component.
+
+**Architecture:** Extract `ToolbarMenuButton.vue` — a generic dropdown wrapper that owns open/close state, outside-click/Escape dismissal, and `disabled` handling, exposing menu items via a scoped default slot (`{ close }`). Refactor the existing `GenerateMenuButton.vue` to be a thin wrapper around it (no behavior change, same public DOM contract). Add a new `ExportMenuButton.vue`, also a thin wrapper, for "打印整册"/"导出 MD". `WorkspaceToolbar.vue` swaps its two standalone buttons for `ExportMenuButton`; `WorkspaceView.vue` requires no changes.
+
+**Tech Stack:** Vue 3 (`<script setup lang="ts">`), Vitest + `@vue/test-utils`, plain CSS in `src/style.css` (no UI component library).
+
+## Global Constraints
+
+- Button label for the merged print/export button is exactly "导出 ▾".
+- Clicking the main button only toggles the dropdown; it never directly fires `print` or `export`.
+- The two menu item buttons keep `data-testid="print"` and `data-testid="export"`.
+- The new toggle button uses `data-testid="export-menu-toggle"`.
+- The merged button is disabled as a whole (native `disabled` attribute) when `lessonCount === 0` — matching the existing per-button disabled condition on "打印整册"/"导出 MD".
+- `GenerateMenuButton.vue`'s public DOM contract (testids `generate-menu-toggle`, `generate`, `batch-generate`, label "生成教案 ▾", events `generate`/`batchGenerate`) must NOT change as an observable behavior — internal implementation may change.
+- `WorkspaceToolbar.vue`'s `defineEmits` block and `WorkspaceView.vue`'s event listeners must NOT change.
+- Reuse existing CSS design tokens only (`var(--line)`, `var(--radius-md)`, `var(--green-100)`, `var(--green-700)`) — no new color/radius values.
+- No changes to generation/print/export business logic, `BatchGenerateDialog.vue`, or `GenerateLessonDialog.vue`.
+
+---
+
+### Task 1: Create `ToolbarMenuButton.vue` with tests
+
+**Files:**
+- Create: `src/components/ToolbarMenuButton.vue`
+- Create: `src/components/ToolbarMenuButton.test.ts`
+
+**Interfaces:**
+- Produces: `ToolbarMenuButton` component with:
+  ```ts
+  defineProps<{
+    label: string
+    toggleTestid: string
+    disabled?: boolean
+  }>()
+  ```
+  No emits — it has no domain knowledge of what actions exist. Default slot receives scope `{ close: () => void }`. Consumers render their own `<li>` menu items inside the slot and call `close()` after emitting their own event.
+- DOM contract later tasks rely on:
+  - Toggle button: `button[:data-testid="toggleTestid"]` (the literal value passed via the `toggleTestid` prop)
+  - Root wrapper: `div.toolbar-menu`
+  - Menu list (only in DOM while open): `ul.toolbar-menu-list`, rendered via `<slot :close="close" />` inside it
+
+- [ ] **Step 1: Write the failing tests**
+
+Create `src/components/ToolbarMenuButton.test.ts`:
+
+```ts
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import ToolbarMenuButton from './ToolbarMenuButton.vue'
+
+function mountMenu(props: { label: string; toggleTestid: string; disabled?: boolean }) {
+  return mount(ToolbarMenuButton, {
+    props,
+    attachTo: document.body,
+    slots: {
+      default: `<template #default="{ close }">
+        <li role="menuitem"><button data-testid="item-a" @click="close">Item A</button></li>
+        <li role="menuitem"><button data-testid="item-b" @click="close">Item B</button></li>
+      </template>`,
+    },
+  })
+}
+
+describe('ToolbarMenuButton', () => {
+  it('renders the toggle button with the given label and closed menu by default', () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').text()).toBe('导出 ▾')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('opens the menu when the toggle button is clicked', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.get('[data-testid="item-a"]').isVisible()).toBe(true)
+    expect(wrapper.get('[data-testid="item-b"]').isVisible()).toBe(true)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when a slot item calls close', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="item-a"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when clicking outside the component', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(true)
+
+    document.body.click()
+    await wrapper.vm.$nextTick()
+
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when Escape is pressed', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(true)
+
+    await wrapper.get('div.toolbar-menu').trigger('keydown', { key: 'Escape' })
+
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('disables the toggle button and never opens the menu when disabled is true', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle', disabled: true })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled')).toBeDefined()
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+})
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `npx vitest run src/components/ToolbarMenuButton.test.ts`
+Expected: FAIL — `Failed to resolve import "./ToolbarMenuButton.vue"` (file doesn't exist yet).
+
+- [ ] **Step 3: Write the component implementation**
+
+Create `src/components/ToolbarMenuButton.vue`:
+
+```vue
+<script setup lang="ts">
+import { onMounted, onUnmounted, ref } from 'vue'
+
+defineProps<{
+  label: string
+  toggleTestid: string
+  disabled?: boolean
+}>()
+
+const open = ref(false)
+const rootRef = ref<HTMLElement | null>(null)
+
+function toggle(): void {
+  open.value = !open.value
+}
+
+function close(): void {
+  open.value = false
+}
+
+function handleDocumentClick(event: MouseEvent): void {
+  if (!rootRef.value) return
+  if (!rootRef.value.contains(event.target as Node)) {
+    close()
+  }
+}
+
+function handleKeydown(event: KeyboardEvent): void {
+  if (event.key === 'Escape') {
+    close()
+  }
+}
+
+onMounted(() => {
+  document.addEventListener('click', handleDocumentClick)
+})
+
+onUnmounted(() => {
+  document.removeEventListener('click', handleDocumentClick)
+})
+</script>
+
+<template>
+  <div ref="rootRef" class="toolbar-menu" @keydown="handleKeydown">
+    <button
+      type="button"
+      :data-testid="toggleTestid"
+      :disabled="disabled"
+      :aria-expanded="open"
+      @click.stop="toggle"
+    >
+      {{ label }}
+    </button>
+    <ul v-if="open" class="toolbar-menu-list" role="menu">
+      <slot :close="close" />
+    </ul>
+  </div>
+</template>
+```
+
+Note: a native `disabled` button never dispatches `click` events, so `toggle()` cannot run while `disabled` is true — no extra guard needed in `toggle()` itself.
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `npx vitest run src/components/ToolbarMenuButton.test.ts`
+Expected: PASS (6 tests).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/components/ToolbarMenuButton.vue src/components/ToolbarMenuButton.test.ts
+git commit -m "feat: add generic ToolbarMenuButton dropdown component"
+```
+
+---
+
+### Task 2: Refactor `GenerateMenuButton.vue` to use `ToolbarMenuButton`
+
+**Files:**
+- Modify: `src/components/GenerateMenuButton.vue` (full rewrite, ~21 lines)
+- Modify: `src/components/GenerateMenuButton.test.ts:54` (one assertion)
+
+**Interfaces:**
+- Consumes: `ToolbarMenuButton` from Task 1 — props `label`, `toggleTestid`, `disabled?`; default slot scope `{ close }`.
+- Produces: `GenerateMenuButton` keeps emitting `generate` / `batchGenerate` exactly as before, with identical DOM contract (`generate-menu-toggle`, `generate`, `batch-generate`, label "生成教案 ▾"). No prior consumer of `GenerateMenuButton` (i.e. `WorkspaceToolbar.vue`) needs to change.
+
+This task is a pure refactor: the existing `GenerateMenuButton.test.ts` (6 tests, unchanged behavior asserted through testids) must still pass except for the one assertion that inspects the internal root class name.
+
+- [ ] **Step 1: Update the one test assertion that touches internal implementation**
+
+In `src/components/GenerateMenuButton.test.ts`, line 54 currently reads:
+
+```ts
+    await wrapper.get('div.generate-menu').trigger('keydown', { key: 'Escape' })
+```
+
+Change it to:
+
+```ts
+    await wrapper.get('div.toolbar-menu').trigger('keydown', { key: 'Escape' })
+```
+
+- [ ] **Step 2: Run the existing test to verify it fails for the expected reason**
+
+Run: `npx vitest run src/components/GenerateMenuButton.test.ts`
+Expected: FAIL on `closes the menu when Escape is pressed` — `div.toolbar-menu` does not exist yet (component still renders `div.generate-menu`). The other 5 tests still pass at this point since the component hasn't changed yet.
+
+- [ ] **Step 3: Rewrite the component to wrap `ToolbarMenuButton`**
+
+Replace the full contents of `src/components/GenerateMenuButton.vue` with:
+
+```vue
+<script setup lang="ts">
+import ToolbarMenuButton from './ToolbarMenuButton.vue'
+
+const emit = defineEmits<{
+  generate: []
+  batchGenerate: []
+}>()
+</script>
+
+<template>
+  <ToolbarMenuButton label="生成教案 ▾" toggle-testid="generate-menu-toggle">
+    <template #default="{ close }">
+      <li role="menuitem">
+        <button
+          type="button"
+          data-testid="batch-generate"
+          @click="
+            emit('batchGenerate')
+            close()
+          "
+        >
+          批量生成
+        </button>
+      </li>
+      <li role="menuitem">
+        <button
+          type="button"
+          data-testid="generate"
+          @click="
+            emit('generate')
+            close()
+          "
+        >
+          生成一篇
+        </button>
+      </li>
+    </template>
+  </ToolbarMenuButton>
+</template>
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `npx vitest run src/components/GenerateMenuButton.test.ts`
+Expected: PASS (6 tests) — identical behavior, now backed by `ToolbarMenuButton`.
+
+Also run the consumers to confirm no regression:
+Run: `npx vitest run src/components/WorkspaceToolbar.test.ts src/components/WorkspaceView.test.ts`
+Expected: same pass/fail counts as before this task (the 3 pre-existing unrelated `WorkspaceView.test.ts` failures about file-upload placeholder text and batch-generate concurrency ordering are unaffected; `WorkspaceToolbar.test.ts` fully passes).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/components/GenerateMenuButton.vue src/components/GenerateMenuButton.test.ts
+git commit -m "refactor: rebuild GenerateMenuButton on top of ToolbarMenuButton"
+```
+
+---
+
+### Task 3: Create `ExportMenuButton.vue` with tests
+
+**Files:**
+- Create: `src/components/ExportMenuButton.vue`
+- Create: `src/components/ExportMenuButton.test.ts`
+
+**Interfaces:**
+- Consumes: `ToolbarMenuButton` from Task 1.
+- Produces: `ExportMenuButton` component:
+  ```ts
+  defineProps<{ disabled?: boolean }>()
+  defineEmits<{ print: []; export: [] }>()
+  ```
+  DOM contract: toggle `button[data-testid="export-menu-toggle"]` with label "导出 ▾"; menu items `button[data-testid="print"]` ("打印整册") and `button[data-testid="export"]` ("导出 MD"), only present while the dropdown is open.
+
+- [ ] **Step 1: Write the failing tests**
+
+Create `src/components/ExportMenuButton.test.ts`:
+
+```ts
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import ExportMenuButton from './ExportMenuButton.vue'
+
+describe('ExportMenuButton', () => {
+  it('renders the toggle button with the menu closed by default', () => {
+    const wrapper = mount(ExportMenuButton, { attachTo: document.body })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').text()).toContain('导出')
+    expect(wrapper.find('[data-testid="print"]').exists()).toBe(false)
+    expect(wrapper.find('[data-testid="export"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('emits print and closes the menu when "打印整册" is clicked', async () => {
+    const wrapper = mount(ExportMenuButton, { attachTo: document.body })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="print"]').trigger('click')
+    expect(wrapper.emitted('print')).toHaveLength(1)
+    expect(wrapper.find('[data-testid="print"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('emits export and closes the menu when "导出 MD" is clicked', async () => {
+    const wrapper = mount(ExportMenuButton, { attachTo: document.body })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="export"]').trigger('click')
+    expect(wrapper.emitted('export')).toHaveLength(1)
+    expect(wrapper.find('[data-testid="export"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('disables the toggle button when disabled prop is true', () => {
+    const wrapper = mount(ExportMenuButton, {
+      props: { disabled: true },
+      attachTo: document.body,
+    })
+    expect(
+      wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled'),
+    ).toBeDefined()
+    wrapper.unmount()
+  })
+
+  it('keeps the toggle button enabled when disabled prop is false', () => {
+    const wrapper = mount(ExportMenuButton, {
+      props: { disabled: false },
+      attachTo: document.body,
+    })
+    expect(
+      wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled'),
+    ).toBeUndefined()
+    wrapper.unmount()
+  })
+})
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `npx vitest run src/components/ExportMenuButton.test.ts`
+Expected: FAIL — `Failed to resolve import "./ExportMenuButton.vue"` (file doesn't exist yet).
+
+- [ ] **Step 3: Write the component implementation**
+
+Create `src/components/ExportMenuButton.vue`:
+
+```vue
+<script setup lang="ts">
+import ToolbarMenuButton from './ToolbarMenuButton.vue'
+
+defineProps<{ disabled?: boolean }>()
+
+const emit = defineEmits<{
+  print: []
+  export: []
+}>()
+</script>
+
+<template>
+  <ToolbarMenuButton label="导出 ▾" toggle-testid="export-menu-toggle" :disabled="disabled">
+    <template #default="{ close }">
+      <li role="menuitem">
+        <button
+          type="button"
+          data-testid="print"
+          @click="
+            emit('print')
+            close()
+          "
+        >
+          打印整册
+        </button>
+      </li>
+      <li role="menuitem">
+        <button
+          type="button"
+          data-testid="export"
+          @click="
+            emit('export')
+            close()
+          "
+        >
+          导出 MD
+        </button>
+      </li>
+    </template>
+  </ToolbarMenuButton>
+</template>
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `npx vitest run src/components/ExportMenuButton.test.ts`
+Expected: PASS (5 tests).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/components/ExportMenuButton.vue src/components/ExportMenuButton.test.ts
+git commit -m "feat: add ExportMenuButton dropdown component"
+```
+
+---
+
+### Task 4: Wire `ExportMenuButton` into `WorkspaceToolbar.vue`
+
+**Files:**
+- Modify: `src/components/WorkspaceToolbar.vue`
+- Modify: `src/components/WorkspaceToolbar.test.ts`
+- Modify: `src/components/WorkspaceView.test.ts:207`
+
+**Interfaces:**
+- Consumes: `ExportMenuButton` from Task 3 — props `disabled?`, events `print`/`export`, testids `export-menu-toggle`/`print`/`export`.
+- Produces: `WorkspaceToolbar` keeps emitting `print` and `export` exactly as before — no change to its own `defineEmits` block or to how `WorkspaceView.vue` listens to it.
+
+- [ ] **Step 1: Write the failing tests**
+
+In `src/components/WorkspaceToolbar.test.ts`, replace the `disables print, export and clear when there are no lessons` test (currently the last test in the file, asserting on `data-testid="print"` / `"export"` directly) with:
+
+```ts
+  it('disables the export menu toggle and clear button when there are no lessons', () => {
+    const wrapper = mountToolbar(0)
+    expect(
+      wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled'),
+    ).toBeDefined()
+    expect(wrapper.get('button[data-testid="clear"]').attributes('disabled')).toBeDefined()
+  })
+
+  it('emits print when the print menu item is clicked', async () => {
+    const wrapper = mountToolbar(3)
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="print"]').trigger('click')
+    expect(wrapper.emitted('print')).toHaveLength(1)
+  })
+
+  it('emits export when the export menu item is clicked', async () => {
+    const wrapper = mountToolbar(3)
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="export"]').trigger('click')
+    expect(wrapper.emitted('export')).toHaveLength(1)
+  })
+```
+
+(Keep every other existing test in the file unchanged.)
+
+In `src/components/WorkspaceView.test.ts`, line 207 currently reads:
+
+```ts
+    await wrapper.get('[data-testid="export"]').trigger('click')
+```
+
+Change it to:
+
+```ts
+    await wrapper.get('[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('[data-testid="export"]').trigger('click')
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `npx vitest run src/components/WorkspaceToolbar.test.ts src/components/WorkspaceView.test.ts`
+Expected: FAIL — `export-menu-toggle` testid not found (toolbar still has the old two standalone buttons).
+
+- [ ] **Step 3: Update the toolbar template**
+
+In `src/components/WorkspaceToolbar.vue`, add the import in `<script setup>` alongside the existing `GenerateMenuButton` import:
+
+```ts
+import ExportMenuButton from './ExportMenuButton.vue'
+```
+
+Replace the two lines:
+
+```vue
+    <button type="button" data-testid="print" :disabled="lessonCount === 0" @click="$emit('print')">打印整册</button>
+    <button type="button" data-testid="export" :disabled="lessonCount === 0" @click="$emit('export')">导出 MD</button>
+```
+
+with:
+
+```vue
+    <ExportMenuButton :disabled="lessonCount === 0" @print="$emit('print')" @export="$emit('export')" />
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `npx vitest run src/components/WorkspaceToolbar.test.ts src/components/WorkspaceView.test.ts`
+Expected: PASS for `WorkspaceToolbar.test.ts` (all tests); `WorkspaceView.test.ts` shows the same pre-existing 3 unrelated failures as before this task (file-upload placeholder text, batch-generate concurrency ordering) and no new failures.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/components/WorkspaceToolbar.vue src/components/WorkspaceToolbar.test.ts src/components/WorkspaceView.test.ts
+git commit -m "feat: merge print/export buttons into a single dropdown in WorkspaceToolbar"
+```
+
+---
+
+### Task 5: Rename CSS classes from `generate-menu` to generic `toolbar-menu`
+
+**Files:**
+- Modify: `src/style.css:273-307` (the three `.generate-menu*` rules)
+- Modify: `src/style.css:778-780` (the mobile media-query rule)
+
+**Interfaces:**
+- Consumes: class names `toolbar-menu` / `toolbar-menu-list` already rendered by `ToolbarMenuButton.vue` (Task 1).
+- Produces: a single shared style block used by both `GenerateMenuButton` and `ExportMenuButton` — no per-button duplication.
+
+- [ ] **Step 1: Rename the dropdown style block**
+
+In `src/style.css`, replace lines 273-307:
+
+```css
+.generate-menu {
+  position: relative;
+  display: inline-flex;
+}
+
+.generate-menu-list {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  margin: 4px 0 0;
+  padding: 4px;
+  min-width: 120px;
+  list-style: none;
+  background: #fff;
+  border: 1px solid var(--line);
+  border-radius: var(--radius-md);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
+  z-index: 10;
+}
+
+.generate-menu-list button {
+  display: block;
+  width: 100%;
+  border: none;
+  background: transparent;
+  border-radius: var(--radius-md);
+  padding: 8px 12px;
+  text-align: left;
+  color: var(--green-700);
+  cursor: pointer;
+}
+
+.generate-menu-list button:hover {
+  background: var(--green-100);
+}
+```
+
+with:
+
+```css
+.toolbar-menu {
+  position: relative;
+  display: inline-flex;
+}
+
+.toolbar-menu-list {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  margin: 4px 0 0;
+  padding: 4px;
+  min-width: 120px;
+  list-style: none;
+  background: #fff;
+  border: 1px solid var(--line);
+  border-radius: var(--radius-md);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
+  z-index: 10;
+}
+
+.toolbar-menu-list button {
+  display: block;
+  width: 100%;
+  border: none;
+  background: transparent;
+  border-radius: var(--radius-md);
+  padding: 8px 12px;
+  text-align: left;
+  color: var(--green-700);
+  cursor: pointer;
+}
+
+.toolbar-menu-list button:hover {
+  background: var(--green-100);
+}
+```
+
+- [ ] **Step 2: Rename the mobile media-query rule**
+
+In `src/style.css`, inside the `@media (max-width: 600px)` block, replace:
+
+```css
+  .workspace-toolbar .generate-menu {
+    flex: 0 0 auto;
+  }
+```
+
+with:
+
+```css
+  .workspace-toolbar .toolbar-menu {
+    flex: 0 0 auto;
+  }
+```
+
+- [ ] **Step 3: Run the full test suite to confirm no regressions**
+
+Run: `npx vitest run`
+Expected: PASS for all suites except the 5 pre-existing, unrelated failures (3 in `WorkspaceView.test.ts` about file-upload placeholder text and batch-generate concurrency ordering, 2 in `useTeachingBook.test.ts` about `store.importFiles`) — CSS changes don't affect Vitest/jsdom assertions; this is a safety check that nothing else broke.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/style.css
+git commit -m "style: rename generate-menu CSS classes to generic toolbar-menu"
+```

docs/superpowers/specs/2026-06-22-merge-print-export-buttons-design.md

@@ -0,0 +1,113 @@
+# 合并「打印整册」与「导出 MD」按钮设计
+
+## 背景
+
+`WorkspaceToolbar.vue` 当前并排放置两个独立按钮，均在 `lessonCount === 0` 时禁用：
+
+```vue
+<button data-testid="print" :disabled="lessonCount === 0" @click="$emit('print')">打印整册</button>
+<button data-testid="export" :disabled="lessonCount === 0" @click="$emit('export')">导出 MD</button>
+```
+
+此前已经把「批量生成」「生成一篇」合并为一个下拉菜单按钮（`GenerateMenuButton.vue`，2026-06-22 提交）。本次需求是用同样的交互模式合并「打印整册」「导出 MD」，并借此机会把两个下拉菜单共用的逻辑抽取成通用组件，避免重复。
+
+## 交互
+
+- 合并后的主按钮文案为「导出 ▾」。
+- 点击主按钮只展开/收起下拉菜单，不直接触发任何操作。
+- 下拉菜单包含「打印整册」「导出 MD」两项，点击任意一项后触发对应事件并收起菜单。
+- 点击外部区域或按 `Escape` 收起菜单（与生成菜单一致）。
+- 主按钮在 `lessonCount === 0` 时整体禁用（原生 `disabled`），此时无法展开菜单——与现有两个按钮各自禁用的行为等价。
+
+## 组件设计
+
+### 新增通用组件 `src/components/ToolbarMenuButton.vue`
+
+把下拉菜单的通用逻辑（展开状态、点击外部关闭、Escape 关闭、disabled 处理）收进这一个组件，具体菜单项通过默认 slot 传入，slot 透出 `close` 方法供菜单项点击后调用：
+
+```ts
+defineProps<{
+  label: string
+  toggleTestid: string
+  disabled?: boolean
+}>()
+```
+
+行为：
+- 内部 `open = ref(false)`；`toggle()` 切换 `open`（已经走过原生 `disabled` 拦截，无需在 JS 里再判断一次）。
+- 根元素 `ref`，`onMounted` 注册 `document` 的 `click` 监听判断点击是否在组件外部，`onUnmounted` 移除；`keydown` 监听 `Escape` 关闭。
+- 主按钮：`<button :data-testid="toggleTestid" :disabled="disabled" :aria-expanded="open" @click.stop="toggle">{{ label }}</button>`。
+- 菜单：`<ul v-if="open" class="toolbar-menu-list" role="menu"><slot :close="close" /></ul>`——因为主按钮 disabled 时浏览器不会触发其 click，`open` 永远不会在 disabled 状态下变为 true，不需要在 `v-if` 里重复判断 `!disabled`。
+- 根元素 class 由 `generate-menu` 改名为通用的 `toolbar-menu`。
+
+### `GenerateMenuButton.vue` 改为薄封装
+
+```vue
+<ToolbarMenuButton label="生成教案 ▾" toggle-testid="generate-menu-toggle">
+  <template #default="{ close }">
+    <li role="menuitem">
+      <button data-testid="batch-generate" @click="emit('batchGenerate'); close()">批量生成</button>
+    </li>
+    <li role="menuitem">
+      <button data-testid="generate" @click="emit('generate'); close()">生成一篇</button>
+    </li>
+  </template>
+</ToolbarMenuButton>
+```
+
+对外接口（`data-testid` 值、按钮文案、`generate` / `batchGenerate` 事件）完全不变，`WorkspaceToolbar.vue` 和 `WorkspaceView.vue` 不需要任何改动。
+
+### 新增 `src/components/ExportMenuButton.vue`
+
+```vue
+<script setup lang="ts">
+defineProps<{ disabled?: boolean }>()
+const emit = defineEmits<{ print: []; export: [] }>()
+</script>
+
+<template>
+  <ToolbarMenuButton label="导出 ▾" toggle-testid="export-menu-toggle" :disabled="disabled">
+    <template #default="{ close }">
+      <li role="menuitem">
+        <button data-testid="print" @click="emit('print'); close()">打印整册</button>
+      </li>
+      <li role="menuitem">
+        <button data-testid="export" @click="emit('export'); close()">导出 MD</button>
+      </li>
+    </template>
+  </ToolbarMenuButton>
+</template>
+```
+
+### `WorkspaceToolbar.vue` 改动
+
+将原来的 `<button data-testid="print">` / `<button data-testid="export">` 替换为：
+
+```vue
+<ExportMenuButton :disabled="lessonCount === 0" @print="$emit('print')" @export="$emit('export')" />
+```
+
+`defineEmits` 块（`print`、`export` 等）和 `WorkspaceView.vue` 的监听逻辑不变。
+
+### 样式 (`src/style.css`)
+
+- 把现有 `.generate-menu` / `.generate-menu-list` / `.generate-menu-list button` 三条规则改名为通用的 `.toolbar-menu` / `.toolbar-menu-list` / `.toolbar-menu-list button`，两个下拉按钮共用，不重复定义。
+- 移动端媒体查询里的 `.workspace-toolbar .generate-menu { flex: 0 0 auto; }` 同样改名为 `.workspace-toolbar .toolbar-menu { flex: 0 0 auto; }`。
+- 不引入任何新的颜色/圆角取值，继续复用 `var(--line)`、`var(--radius-md)`、`var(--green-100)`、`var(--green-700)` 等既有变量。
+
+## 测试改动
+
+- 新增 `ToolbarMenuButton.test.ts`：覆盖默认收起、点击展开、点击菜单项后通过 slot 的 `close()` 收起、点击外部收起、`Escape` 收起、`disabled` 时主按钮不可点击（因此菜单永远不会展开）。
+- `GenerateMenuButton.test.ts`：现有用例保持不变，唯一改动是把断言根元素 class 的那一行从 `div.generate-menu` 改成 `div.toolbar-menu`（实现细节变化，行为不变）。
+- 新增 `ExportMenuButton.test.ts`：覆盖点击「打印整册」触发 `print` 并收起菜单、点击「导出 MD」触发 `export` 并收起菜单、`disabled` 为 `true` 时主按钮 `disabled` 属性存在。
+- `WorkspaceToolbar.test.ts`：
+  - `disables print, export and clear when there are no lessons` 用例改写——`lessonCount === 0` 时菜单项不在 DOM 里（菜单不会展开），改为断言 `export-menu-toggle` 的 `disabled` 属性存在，以及 `clear` 的 `disabled` 属性存在。
+  - 如需要保留对菜单项可点击性的验证，新增一条用例：在 `lessonCount` 大于 0 时展开菜单点击 `print` / `export`，确认事件被触发。
+- `WorkspaceView.test.ts`：第 207 行 `await wrapper.get('[data-testid="export"]').trigger('click')` 之前补一步 `await wrapper.get('[data-testid="export-menu-toggle"]').trigger('click')`。
+
+## 范围说明
+
+本次改动仅涉及 UI 层的按钮合并、通用下拉逻辑抽取，不涉及：
+- 打印逻辑（`$emit('print')` 之后 `WorkspaceView.vue` 内部如何打印）或导出逻辑（`zipExporter` 相关代码）。
+- 移动端窄屏样式的额外适配（沿用现有响应式规则，新按钮作为 flex item 自然换行）。
+- 对 `GenerateMenuButton.vue` 公开接口或文案的任何改动。

src/components/ExportMenuButton.test.ts

@@ -0,0 +1,53 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import ExportMenuButton from './ExportMenuButton.vue'
+
+describe('ExportMenuButton', () => {
+  it('renders the toggle button with the menu closed by default', () => {
+    const wrapper = mount(ExportMenuButton, { attachTo: document.body })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').text()).toContain('导出')
+    expect(wrapper.find('[data-testid="print"]').exists()).toBe(false)
+    expect(wrapper.find('[data-testid="export"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('emits print and closes the menu when "打印整册" is clicked', async () => {
+    const wrapper = mount(ExportMenuButton, { attachTo: document.body })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="print"]').trigger('click')
+    expect(wrapper.emitted('print')).toHaveLength(1)
+    expect(wrapper.find('[data-testid="print"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('emits export and closes the menu when "导出 MD" is clicked', async () => {
+    const wrapper = mount(ExportMenuButton, { attachTo: document.body })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="export"]').trigger('click')
+    expect(wrapper.emitted('export')).toHaveLength(1)
+    expect(wrapper.find('[data-testid="export"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('disables the toggle button when disabled prop is true', () => {
+    const wrapper = mount(ExportMenuButton, {
+      props: { disabled: true },
+      attachTo: document.body,
+    })
+    expect(
+      wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled'),
+    ).toBeDefined()
+    wrapper.unmount()
+  })
+
+  it('keeps the toggle button enabled when disabled prop is false', () => {
+    const wrapper = mount(ExportMenuButton, {
+      props: { disabled: false },
+      attachTo: document.body,
+    })
+    expect(
+      wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled'),
+    ).toBeUndefined()
+    wrapper.unmount()
+  })
+})

src/components/ExportMenuButton.vue

@@ -0,0 +1,41 @@
+<script setup lang="ts">
+import ToolbarMenuButton from './ToolbarMenuButton.vue'
+
+defineProps<{ disabled?: boolean }>()
+
+const emit = defineEmits<{
+  print: []
+  export: []
+}>()
+</script>
+
+<template>
+  <ToolbarMenuButton label="导出 ▾" toggle-testid="export-menu-toggle" :disabled="disabled">
+    <template #default="{ close }">
+      <li role="menuitem">
+        <button
+          type="button"
+          data-testid="print"
+          @click="
+            emit('print');
+            close()
+          "
+        >
+          打印整册
+        </button>
+      </li>
+      <li role="menuitem">
+        <button
+          type="button"
+          data-testid="export"
+          @click="
+            emit('export');
+            close()
+          "
+        >
+          导出 MD
+        </button>
+      </li>
+    </template>
+  </ToolbarMenuButton>
+</template>

src/components/GenerateMenuButton.test.ts

@@ -54,7 +54,7 @@ describe('GenerateMenuButton', () => {
     await wrapper.get('button[data-testid="generate-menu-toggle"]').trigger('click')
     expect(wrapper.find('[data-testid="generate"]').exists()).toBe(true)
 
-    await wrapper.get('div.generate-menu').trigger('keydown', { key: 'Escape' })
+    await wrapper.get('div.toolbar-menu').trigger('keydown', { key: 'Escape' })
 
     expect(wrapper.find('[data-testid="generate"]').exists()).toBe(false)
     wrapper.unmount()

src/components/GenerateMenuButton.vue

@@ -1,68 +1,39 @@
 <script setup lang="ts">
-import { onMounted, onUnmounted, ref } from 'vue'
+import ToolbarMenuButton from './ToolbarMenuButton.vue'
 
 const emit = defineEmits<{
   generate: []
   batchGenerate: []
 }>()
-
-const open = ref(false)
-const rootRef = ref<HTMLElement | null>(null)
-
-function toggle(): void {
-  open.value = !open.value
-}
-
-function close(): void {
-  open.value = false
-}
-
-function select(action: 'generate' | 'batchGenerate'): void {
-  emit(action)
-  close()
-}
-
-function handleDocumentClick(event: MouseEvent): void {
-  if (!rootRef.value) return
-  if (!rootRef.value.contains(event.target as Node)) {
-    close()
-  }
-}
-
-function handleKeydown(event: KeyboardEvent): void {
-  if (event.key === 'Escape') {
-    close()
-  }
-}
-
-onMounted(() => {
-  document.addEventListener('click', handleDocumentClick)
-})
-
-onUnmounted(() => {
-  document.removeEventListener('click', handleDocumentClick)
-})
 </script>
 
 <template>
-  <div ref="rootRef" class="generate-menu" @keydown="handleKeydown">
+  <ToolbarMenuButton label="生成教案 ▾" toggle-testid="generate-menu-toggle">
+    <template #default="{ close }">
+      <li role="menuitem">
         <button
           type="button"
-      data-testid="generate-menu-toggle"
+          data-testid="batch-generate"
-      :aria-expanded="open"
+          @click="
-      @click.stop="toggle"
+            emit('batchGenerate');
+            close()
+          "
         >
-      生成教案 ▾
-    </button>
-    <ul v-if="open" class="generate-menu-list" role="menu">
-      <li role="menuitem">
-        <button type="button" data-testid="batch-generate" @click="select('batchGenerate')">
           批量生成
         </button>
       </li>
       <li role="menuitem">
-        <button type="button" data-testid="generate" @click="select('generate')">生成一篇</button>
+        <button
+          type="button"
+          data-testid="generate"
+          @click="
+            emit('generate');
+            close()
+          "
+        >
+          生成一篇
+        </button>
       </li>
-    </ul>
+    </template>
-  </div>
+  </ToolbarMenuButton>
 </template>

src/components/ToolbarMenuButton.test.ts

@@ -0,0 +1,72 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import ToolbarMenuButton from './ToolbarMenuButton.vue'
+
+function mountMenu(props: { label: string; toggleTestid: string; disabled?: boolean }) {
+  return mount(ToolbarMenuButton, {
+    props,
+    attachTo: document.body,
+    slots: {
+      default: `<template #default="{ close }">
+        <li role="menuitem"><button data-testid="item-a" @click="close">Item A</button></li>
+        <li role="menuitem"><button data-testid="item-b" @click="close">Item B</button></li>
+      </template>`,
+    },
+  })
+}
+
+describe('ToolbarMenuButton', () => {
+  it('renders the toggle button with the given label and closed menu by default', () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').text()).toBe('导出 ▾')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('opens the menu when the toggle button is clicked', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.get('[data-testid="item-a"]').isVisible()).toBe(true)
+    expect(wrapper.get('[data-testid="item-b"]').isVisible()).toBe(true)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when a slot item calls close', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="item-a"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when clicking outside the component', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(true)
+
+    document.body.click()
+    await wrapper.vm.$nextTick()
+
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when Escape is pressed', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(true)
+
+    await wrapper.get('div.toolbar-menu').trigger('keydown', { key: 'Escape' })
+
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('disables the toggle button and never opens the menu when disabled is true', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle', disabled: true })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled')).toBeDefined()
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+})

src/components/ToolbarMenuButton.vue

@@ -0,0 +1,58 @@
+<script setup lang="ts">
+import { onMounted, onUnmounted, ref } from 'vue'
+
+defineProps<{
+  label: string
+  toggleTestid: string
+  disabled?: boolean
+}>()
+
+const open = ref(false)
+const rootRef = ref<HTMLElement | null>(null)
+
+function toggle(): void {
+  open.value = !open.value
+}
+
+function close(): void {
+  open.value = false
+}
+
+function handleDocumentClick(event: MouseEvent): void {
+  if (!rootRef.value) return
+  if (!rootRef.value.contains(event.target as Node)) {
+    close()
+  }
+}
+
+function handleKeydown(event: KeyboardEvent): void {
+  if (event.key === 'Escape') {
+    close()
+  }
+}
+
+onMounted(() => {
+  document.addEventListener('click', handleDocumentClick)
+})
+
+onUnmounted(() => {
+  document.removeEventListener('click', handleDocumentClick)
+})
+</script>
+
+<template>
+  <div ref="rootRef" class="toolbar-menu" @keydown="handleKeydown">
+    <button
+      type="button"
+      :data-testid="toggleTestid"
+      :disabled="disabled"
+      :aria-expanded="open"
+      @click.stop="toggle"
+    >
+      {{ label }}
+    </button>
+    <ul v-if="open" class="toolbar-menu-list" role="menu">
+      <slot :close="close" />
+    </ul>
+  </div>
+</template>

src/components/WorkspaceToolbar.test.ts

@@ -42,10 +42,25 @@ describe('WorkspaceToolbar', () => {
     expect(wrapper.get('button[data-testid="back"]').attributes('disabled')).toBeUndefined()
   })
 
-  it('disables print, export and clear when there are no lessons', () => {
+  it('disables the export menu toggle and clear button when there are no lessons', () => {
     const wrapper = mountToolbar(0)
-    expect(wrapper.get('button[data-testid="print"]').attributes('disabled')).toBeDefined()
+    expect(
-    expect(wrapper.get('button[data-testid="export"]').attributes('disabled')).toBeDefined()
+      wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled'),
+    ).toBeDefined()
     expect(wrapper.get('button[data-testid="clear"]').attributes('disabled')).toBeDefined()
   })
+
+  it('emits print when the print menu item is clicked', async () => {
+    const wrapper = mountToolbar(3)
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="print"]').trigger('click')
+    expect(wrapper.emitted('print')).toHaveLength(1)
+  })
+
+  it('emits export when the export menu item is clicked', async () => {
+    const wrapper = mountToolbar(3)
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="export"]').trigger('click')
+    expect(wrapper.emitted('export')).toHaveLength(1)
+  })
 })

src/components/WorkspaceToolbar.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import type { SaveStatus } from '../composables/useTeachingBook'
+import ExportMenuButton from './ExportMenuButton.vue'
 import GenerateMenuButton from './GenerateMenuButton.vue'
 
 const props = defineProps<{
@@ -30,8 +31,7 @@ const saveStatusLabel: Record<SaveStatus, string> = {
   <header class="workspace-toolbar">
     <button type="button" data-testid="back" @click="$emit('back')">返回列表</button>
     <GenerateMenuButton @generate="$emit('generate')" @batch-generate="$emit('batchGenerate')" />
-    <button type="button" data-testid="print" :disabled="lessonCount === 0" @click="$emit('print')">打印整册</button>
+    <ExportMenuButton :disabled="lessonCount === 0" @print="$emit('print')" @export="$emit('export')" />
-    <button type="button" data-testid="export" :disabled="lessonCount === 0" @click="$emit('export')">导出 MD</button>
     <button type="button" data-testid="clear" :disabled="lessonCount === 0" @click="$emit('clear')">清空</button>
 
     <span class="workspace-toolbar-count">共 {{ lessonCount }} 课</span>

src/components/WorkspaceView.test.ts

@@ -204,6 +204,7 @@ describe('WorkspaceView', () => {
     const wrapper = mount(WorkspaceView, { props: { bookId: 'b1' } })
     await flushPromises()
 
+    await wrapper.get('[data-testid="export-menu-toggle"]').trigger('click')
     await wrapper.get('[data-testid="export"]').trigger('click')
     await flushPromises()
 

src/style.css

@@ -270,12 +270,12 @@ table {
   cursor: not-allowed;
 }
 
-.generate-menu {
+.toolbar-menu {
   position: relative;
   display: inline-flex;
 }
 
-.generate-menu-list {
+.toolbar-menu-list {
   position: absolute;
   top: 100%;
   left: 0;
@@ -290,7 +290,7 @@ table {
   z-index: 10;
 }
 
-.generate-menu-list button {
+.toolbar-menu-list button {
   display: block;
   width: 100%;
   border: none;
@@ -302,7 +302,7 @@ table {
   cursor: pointer;
 }
 
-.generate-menu-list button:hover {
+.toolbar-menu-list button:hover {
   background: var(--green-100);
 }
 
@@ -775,7 +775,7 @@ table {
     flex: 0 0 auto;
   }
 
-  .workspace-toolbar .generate-menu {
+  .workspace-toolbar .toolbar-menu {
     flex: 0 0 auto;
   }