From 836941fda819c81038f09a45c873782e27dd704e Mon Sep 17 00:00:00 2001
From: RainbowBird <git@luoling.moe>
Date: Mon, 7 Sep 2026 00:28:01 +0800
Subject: [PATCH] feat(stage-layouts): simplify mobile stage controls (#2472)

Signed-off-by: RainbowBird <git@luoling.moe>
---
 apps/stage-pocket/src/pages/index.vue         |   2 -
 .../InteractiveArea.browser.test.ts           | 130 +++++++++++-
 .../renderer/components/InteractiveArea.vue   |  24 ---
 apps/stage-web/src/pages/index.vue            |   2 -
 docs/ai/context/ui-components.md              |  27 +++
 packages/i18n/src/locales/en/stage.yaml       |  25 ++-
 packages/i18n/src/locales/zh-Hans/stage.yaml  |  25 ++-
 .../src/components/Layouts/HeaderAvatar.vue   |  13 +-
 .../Layouts/InteractiveArea/Actions/About.vue |   9 +-
 .../InteractiveArea/Actions/ViewControls.vue  |  24 ++-
 .../src/components/Layouts/MobileHeader.vue   |  16 +-
 .../components/Layouts/MobileHeaderLink.vue   |  35 ----
 .../Layouts/MobileInteractiveArea.vue         | 138 ++++--------
 .../Layouts/mobile-settings-drawer.vue        | 197 ++++++++++++++++++
 .../components/Widgets/ChatActionButtons.vue  |  28 ---
 .../character-switcher-drawer.browser.test.ts |  94 +++++++++
 .../misc/character-switcher-drawer.vue        | 132 ++++++++++++
 .../stage-ui/src/components/misc/index.ts     |   1 +
 .../mobile-composer-height.browser.test.ts    |  37 ++++
 .../sessions-dialog.browser.test.ts           |  51 ++++-
 .../chat/components/sessions-dialog.vue       | 142 ++++---------
 .../sessions-drawer.browser.test.ts           |  11 +-
 .../chat/components/sessions-drawer.vue       |  25 +--
 .../chat/components/sessions-list.vue         | 132 ++++++++++++
 .../dialogs/bottom-drawer.browser.test.ts     |  45 ++++
 packages/stage-ui/vitest.config.ts            |  16 ++
 packages/ui/package.json                      |   1 +
 .../form/textarea/basic-text-area.vue         |  11 +-
 .../src/components/layouts/bottom-drawer.vue  |  72 +++++++
 packages/ui/src/components/layouts/index.ts   |   1 +
 pnpm-lock.yaml                                |   3 +
 31 files changed, 1117 insertions(+), 352 deletions(-)
 delete mode 100644 packages/stage-layouts/src/components/Layouts/MobileHeaderLink.vue
 create mode 100644 packages/stage-layouts/src/components/Layouts/mobile-settings-drawer.vue
 create mode 100644 packages/stage-ui/src/components/misc/character-switcher-drawer.browser.test.ts
 create mode 100644 packages/stage-ui/src/components/misc/character-switcher-drawer.vue
 create mode 100644 packages/stage-ui/src/components/misc/mobile-composer-height.browser.test.ts
 create mode 100644 packages/stage-ui/src/components/scenarios/chat/components/sessions-list.vue
 create mode 100644 packages/stage-ui/src/components/scenarios/dialogs/bottom-drawer.browser.test.ts
 create mode 100644 packages/ui/src/components/layouts/bottom-drawer.vue

diff --git a/apps/stage-pocket/src/pages/index.vue b/apps/stage-pocket/src/pages/index.vue
index 88482db1a..dee35258b 100644
--- a/apps/stage-pocket/src/pages/index.vue
+++ b/apps/stage-pocket/src/pages/index.vue
@@ -1,7 +1,6 @@
 <script setup lang="ts">
 import Header from '@proj-airi/stage-layouts/components/Layouts/Header.vue'
 import InteractiveArea from '@proj-airi/stage-layouts/components/Layouts/InteractiveArea.vue'
-import MobileHeader from '@proj-airi/stage-layouts/components/Layouts/MobileHeader.vue'
 import MobileInteractiveArea from '@proj-airi/stage-layouts/components/Layouts/MobileInteractiveArea.vue'
 import workletUrl from '@proj-airi/stage-ui/workers/vad/process.worklet?worker&url'
 
@@ -200,7 +199,6 @@ watch([stream, () => vadLoaded.value], async ([s, loaded]) => {
       <!-- header -->
       <div class="px-0 py-1 md:px-3 md:py-3" w-full gap-2>
         <Header class="hidden md:flex" />
-        <MobileHeader class="flex md:hidden" />
       </div>
       <!-- page -->
       <div relative flex="~ 1 row gap-y-0 gap-x-2 <md:col" min-h-0>
diff --git a/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.browser.test.ts b/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.browser.test.ts
index 9004e4171..2b00d177f 100644
--- a/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.browser.test.ts
+++ b/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.browser.test.ts
@@ -1,3 +1,4 @@
+import type { AuthorizationHandler } from '@proj-airi/stage-ui/libs/auth'
 import type { ChatSessionMeta } from '@proj-airi/stage-ui/types/chat-session'
 import type { Component } from 'vue'
 
@@ -6,13 +7,14 @@ import MobileInteractiveArea from '@proj-airi/stage-layouts/components/Layouts/M
 import ChatArea from '@proj-airi/stage-layouts/components/Widgets/ChatArea'
 
 import { PiniaColada } from '@pinia/colada'
+import { browserAuthorizationHandler, registerAuthorizationHandler } from '@proj-airi/stage-ui/libs/auth'
 import { useChatStore } from '@proj-airi/stage-ui/stores/chat'
 import { useChatSessionStore } from '@proj-airi/stage-ui/stores/chat/session-store'
 import { useChatStreamStore } from '@proj-airi/stage-ui/stores/chat/stream-store'
 import { createPinia } from 'pinia'
 import { describe, expect, it, vi } from 'vitest'
 import { render } from 'vitest-browser-vue'
-import { userEvent } from 'vitest/browser'
+import { page, userEvent } from 'vitest/browser'
 import { nextTick } from 'vue'
 import { createI18n } from 'vue-i18n'
 import { createMemoryHistory, createRouter } from 'vue-router'
@@ -102,6 +104,132 @@ async function attachImages(screen: Awaited<ReturnType<typeof renderArea>>['scre
 }
 
 describe('interactive area synchronized state', () => {
+  it('opens mobile settings from an icon-only header and restores focus', async () => {
+    await page.viewport(390, 844)
+    const { screen } = await renderArea(MobileInteractiveArea)
+    const trigger = screen.getByRole('button', { name: 'stage.mobile-tools.title', exact: true })
+    const bounds = trigger.element().getBoundingClientRect()
+    expect(bounds.width).toBeGreaterThanOrEqual(44)
+    expect(bounds.height).toBeGreaterThanOrEqual(44)
+    expect(bounds.right).toBeLessThanOrEqual(390)
+    expect(bounds.left).toBeGreaterThan(300)
+    expect(bounds.top).toBeLessThan(40)
+    expect(trigger.element().textContent?.trim()).toBe('')
+    await expect.element(screen.getByTestId('speech-mute-button')).not.toBeInTheDocument()
+
+    await trigger.click()
+    await expect.element(screen.getByRole('dialog', { name: 'stage.mobile-tools.title' })).toBeVisible()
+    await expect.element(screen.getByText('stage.mobile-tools.sign-in', { exact: true })).toBeVisible()
+    const account = screen.getByRole('button', { name: 'stage.mobile-tools.sign-in stage.mobile-tools.account-description' }).element()
+    const drawerTitle = screen.getByRole('heading', { name: 'stage.mobile-tools.title' }).element()
+    const accountContent = account.querySelector<HTMLElement>('.basic-button-content')
+    // ROOT CAUSE:
+    //
+    // The account row relied on scoped descendant CSS to stretch
+    // BasicButton's content wrapper. The combined browser bundle could leave
+    // that wrapper at its content width, centering the label inward. Comparing
+    // text coordinates was also unstable while the drawer portal animated, so
+    // assert the owned row and content geometry directly.
+    expect(accountContent).not.toBeNull()
+    await expect.poll(() => getComputedStyle(account).paddingLeft).toBe('0px')
+    expect(account.getBoundingClientRect().left).toBe(drawerTitle.getBoundingClientRect().left)
+    expect(accountContent!.getBoundingClientRect().width).toBe(account.clientWidth)
+    expect(account.getBoundingClientRect().height).toBe(56)
+    expect(account.querySelector('[data-avatar-fallback], [data-avatar-image]')).toBeNull()
+    await expect.element(screen.getByText('stage.mobile-tools.cleanup', { exact: true })).not.toBeInTheDocument()
+    await expect.element(screen.getByRole('switch', { name: 'stage.mobile-tools.character-voice' })).toBeVisible()
+    const voice = screen.getByRole('switch', { name: 'stage.mobile-tools.character-voice' })
+    const before = voice.element().getAttribute('aria-checked')
+    await voice.click()
+    await expect.element(voice).toHaveAttribute('aria-checked', before === 'true' ? 'false' : 'true')
+    await expect.element(screen.getByRole('button', { name: 'Close', exact: true })).not.toBeInTheDocument()
+    await userEvent.keyboard('{Escape}')
+    await expect.element(trigger).toHaveFocus()
+  })
+
+  it('removes the clear-messages action from desktop chat surfaces', async () => {
+    for (const component of [InteractiveArea, SharedInteractiveArea, ChatArea]) {
+      const { screen } = await renderArea(component)
+      expect(screen.container.querySelector('[class*="trash-bin-2-bold-duotone"]')).toBeNull()
+      screen.unmount()
+    }
+  })
+
+  it('places the conversation selector opposite settings in the mobile header', async () => {
+    await page.viewport(390, 844)
+    const { screen } = await renderArea(MobileInteractiveArea)
+    const composer = screen.getByTestId('mobile-message-composer').element()
+    const conversations = screen.getByTestId('conversation-selector-button').element()
+    const bounds = conversations.getBoundingClientRect()
+    const settingsBounds = screen.getByTestId('mobile-settings-button').element().getBoundingClientRect()
+    expect(composer.contains(conversations)).toBe(false)
+    expect(bounds.left).toBe(12)
+    expect(bounds.top).toBe(settingsBounds.top)
+    expect(bounds.width).toBe(44)
+    expect(bounds.height).toBe(44)
+    expect(bounds.left).toBe(390 - settingsBounds.right)
+    expect(conversations.textContent?.trim()).toBe('')
+    await screen.getByTestId('conversation-selector-button').click()
+    await expect.element(screen.getByRole('dialog')).toBeVisible()
+  })
+
+  it('keeps the empty mobile input compact and aligns the one-line send action', async () => {
+    // ROOT CAUSE:
+    //
+    // The hierarchy redesign removed the input bubble's compact maximum width.
+    // The 40px bubble also top-aligned its 32px textarea while the send action
+    // aligned to the bottom of the same row.
+    await page.viewport(390, 844)
+    const { screen } = await renderArea(MobileInteractiveArea)
+    const composer = screen.getByTestId('mobile-message-composer').element()
+    const bubble = screen.getByTestId('mobile-input-bubble').element()
+    const input = screen.getByRole('textbox').element()
+    const composerStyle = getComputedStyle(composer)
+    const composerContentWidth = composer.clientWidth
+      - Number.parseFloat(composerStyle.paddingLeft)
+      - Number.parseFloat(composerStyle.paddingRight)
+
+    expect(Math.round(bubble.getBoundingClientRect().width)).toBe(Math.round(composerContentWidth * 0.7))
+
+    await userEvent.fill(input, 'hi')
+    const send = composer.querySelector<HTMLButtonElement>('button')
+    expect(send).not.toBeNull()
+    await expect.poll(() => input.getBoundingClientRect().height).toBe(32)
+    expect(send!.getBoundingClientRect().height).toBe(32)
+    expect(input.getBoundingClientRect().top).toBe(send!.getBoundingClientRect().top)
+    expect(input.getBoundingClientRect().bottom).toBe(send!.getBoundingClientRect().bottom)
+  })
+
+  it('closes mobile settings before requesting sign-in', async () => {
+    let openDialogAtSignIn = true
+    const authorize = vi.fn<AuthorizationHandler>(async () => {
+      openDialogAtSignIn = document.querySelector('[role="dialog"][data-state="open"]') !== null
+    })
+    registerAuthorizationHandler(authorize)
+    try {
+      const { screen } = await renderArea(MobileInteractiveArea)
+      await screen.getByTestId('mobile-settings-button').click()
+      await screen.getByRole('button', { name: 'stage.mobile-tools.sign-in stage.mobile-tools.account-description' }).click()
+      await expect.poll(() => authorize.mock.calls.length).toBe(1)
+      expect(openDialogAtSignIn).toBe(false)
+      await expect.element(screen.getByRole('dialog', { name: 'stage.mobile-tools.title' })).not.toBeInTheDocument()
+    }
+    finally {
+      registerAuthorizationHandler(browserAuthorizationHandler)
+    }
+  })
+
+  it('returns from hearing to mobile settings without stacked dialogs', async () => {
+    const { screen } = await renderArea(MobileInteractiveArea)
+    await screen.getByTestId('mobile-settings-button').click()
+    await screen.getByRole('button', { name: 'stage.mobile-tools.hearing' }).click()
+    await expect.element(screen.getByRole('dialog', { name: 'stage.mobile-tools.hearing' })).toBeVisible()
+    await expect.element(screen.getByRole('dialog', { name: 'stage.mobile-tools.title' })).not.toBeInTheDocument()
+    await userEvent.keyboard('{Escape}')
+    await expect.element(screen.getByRole('dialog', { name: 'stage.mobile-tools.title' })).toBeVisible()
+    await expect.element(screen.getByRole('dialog', { name: 'stage.mobile-tools.hearing' })).not.toBeInTheDocument()
+  })
+
   // https://github.com/moeru-ai/airi/pull/2399
   it('keeps the input visible when a short window contains many attachments', async () => {
     // ROOT CAUSE:
diff --git a/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.vue b/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.vue
index c15dc761a..d570eed70 100644
--- a/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.vue
+++ b/apps/stage-tamagotchi/src/renderer/components/InteractiveArea.vue
@@ -63,7 +63,6 @@ const sendModeLabels = computed<Record<SendMode, string>>(() => ({
 const {
   trackChatMessageDeleted,
   trackChatMessageRetried,
-  trackChatMessagesCleared,
 } = useAnalytics()
 const { showStopSpeakingButton, stopSpeakingFromChat } = useStopSpeakingButton()
 
@@ -255,15 +254,6 @@ async function handleToolCallRerun(payload: { message: ChatHistoryItem, index: n
     args: payload.args,
   })
 }
-
-async function handleCleanupMessages() {
-  const messageCount = messages.value.filter(message => message.role !== 'system').length
-  await chatStore.cleanup(chatSession.activeSessionId)
-  trackChatMessagesCleared({
-    source: 'chat_controls',
-    message_count: messageCount,
-  })
-}
 </script>
 
 <template>
@@ -410,20 +400,6 @@ async function handleCleanupMessages() {
             <div class="i-solar:stop-circle-bold-duotone" />
           </button>
 
-          <button
-            :class="[
-              'max-h-[10lh] min-h-[1lh]',
-            ]"
-            bg="neutral-100 dark:neutral-800"
-            text="lg neutral-500 dark:neutral-400"
-            hover:text="red-500 dark:red-400"
-            flex items-center justify-center rounded-md p-2 outline-none
-            transition-colors transition-transform active:scale-95
-            @click="handleCleanupMessages"
-          >
-            <div class="i-solar:trash-bin-2-bold-duotone" />
-          </button>
-
           <!-- Image Journal Deep Link -->
           <button
             class="max-h-[10lh] min-h-[1lh]"
diff --git a/apps/stage-web/src/pages/index.vue b/apps/stage-web/src/pages/index.vue
index ca1490f00..30d88b1df 100644
--- a/apps/stage-web/src/pages/index.vue
+++ b/apps/stage-web/src/pages/index.vue
@@ -1,7 +1,6 @@
 <script setup lang="ts">
 import Header from '@proj-airi/stage-layouts/components/Layouts/Header.vue'
 import InteractiveArea from '@proj-airi/stage-layouts/components/Layouts/InteractiveArea.vue'
-import MobileHeader from '@proj-airi/stage-layouts/components/Layouts/MobileHeader.vue'
 import MobileInteractiveArea from '@proj-airi/stage-layouts/components/Layouts/MobileInteractiveArea.vue'
 import workletUrl from '@proj-airi/stage-ui/workers/vad/process.worklet?worker&url'
 
@@ -210,7 +209,6 @@ const cursorPosition = computed(() => ({
       <!-- header -->
       <div class="px-0 py-1 md:px-3 md:py-3" w-full gap-2>
         <Header class="hidden md:flex" />
-        <MobileHeader class="flex md:hidden" />
       </div>
       <!-- page -->
       <div relative flex="~ 1 row gap-y-0 gap-x-2 <md:col">
diff --git a/docs/ai/context/ui-components.md b/docs/ai/context/ui-components.md
index b78ec973f..a0a170d66 100644
--- a/docs/ai/context/ui-components.md
+++ b/docs/ai/context/ui-components.md
@@ -118,6 +118,29 @@ Line-clamped content container that expands and collapses when the overflowing c
 
 ## Misc
 
+### BottomDrawer
+
+Mobile modal surface built on Vaul Vue. It owns the drag handle, overlay,
+focus boundary, scroll region, and bottom safe area. Dragging
+starts only on the handle, so action buttons and scrolling do not dismiss it.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `title` | `string` | required | Visible and accessible title |
+| `minimumHeight` | `'content' \| 'half'` | `'content'` | Uses content height or at least half of the viewport height |
+
+Dismiss with the handle, overlay, or Escape. There is no close button.
+
+**v-model**: `boolean`, defaults to `false`.
+
+**Slots**: `trigger` (one button), `default` (drawer content).
+
+**Emits**: `afterClose()` after the dismissal animation;
+`closeAutoFocus(event)` to prevent focus restoration when another modal opens.
+
+Use for mobile action menus and settings panels. Desktop dialogs and panels
+that need snap points use their own surface.
+
 ### Avatar
 
 Shared user-avatar primitive built on Reka UI. It retries when `src` changes and
@@ -334,6 +357,10 @@ Two-column input for key-value pairs.
 ### BasicTextarea
 
 Auto-resizing textarea with submit and paste-file events.
+The native row count defaults to one, so typing does not introduce a second
+row. Content grows when it wraps. Native `rows` attributes can override this minimum.
+When set, `defaultHeight` also provides the baseline for content measurement,
+so flex layouts do not stretch the empty measurement box.
 
 | Prop | Type | Default | Description |
 |------|------|---------|-------------|
diff --git a/packages/i18n/src/locales/en/stage.yaml b/packages/i18n/src/locales/en/stage.yaml
index 1f30b332a..865d59eec 100644
--- a/packages/i18n/src/locales/en/stage.yaml
+++ b/packages/i18n/src/locales/en/stage.yaml
@@ -1,3 +1,23 @@
+character-switcher:
+  title: Switch character
+  manage: Manage characters
+  empty: No characters yet
+  failed: Could not switch characters. Try again.
+mobile-tools:
+  sign-in: Sign in to AIRI
+  account-description: Account and preferences
+  sound: Sound
+  character-voice: Character voice
+  title: Settings
+  appearance: Appearance
+  dark-mode: Dark mode
+  application: Application
+  more: More
+  background: Background
+  settings: All settings
+  about: About
+  view: View
+  hearing: Hearing
 chat:
   actions:
     retry: Retry
@@ -9,7 +29,10 @@ chat:
   reasoning: Reasoning
   sessions:
     title: Conversations
-    new: + New
+    new: New conversation
+    current: Current
+    confirm-delete: Delete this conversation and its messages?
+    cancel: Cancel
     empty: No conversations yet
     cloud-badge: Synced to cloud
     new-chat-fallback: New chat
diff --git a/packages/i18n/src/locales/zh-Hans/stage.yaml b/packages/i18n/src/locales/zh-Hans/stage.yaml
index 237003e28..59c4ba9fa 100644
--- a/packages/i18n/src/locales/zh-Hans/stage.yaml
+++ b/packages/i18n/src/locales/zh-Hans/stage.yaml
@@ -1,3 +1,23 @@
+character-switcher:
+  title: 切换角色
+  manage: 管理角色
+  empty: 暂无角色
+  failed: 无法切换角色，请重试。
+mobile-tools:
+  sign-in: 登录 AIRI
+  account-description: 账户与偏好
+  sound: 声音
+  character-voice: 角色声音
+  title: 设置
+  appearance: 外观
+  dark-mode: 深色模式
+  application: 应用
+  more: 更多
+  background: 背景
+  settings: 全部设置
+  about: 关于
+  view: 视角
+  hearing: 听觉
 chat:
   actions:
     retry: 重试
@@ -9,7 +29,10 @@ chat:
   reasoning: 思考
   sessions:
     title: 对话
-    new: + 新建
+    new: 新建对话
+    current: 当前
+    confirm-delete: 删除此对话及其中的消息？
+    cancel: 取消
     empty: 暂无对话
     cloud-badge: 已同步到云
     new-chat-fallback: 新建对话
diff --git a/packages/stage-layouts/src/components/Layouts/HeaderAvatar.vue b/packages/stage-layouts/src/components/Layouts/HeaderAvatar.vue
index f42ffe9fe..88f82345a 100644
--- a/packages/stage-layouts/src/components/Layouts/HeaderAvatar.vue
+++ b/packages/stage-layouts/src/components/Layouts/HeaderAvatar.vue
@@ -15,6 +15,11 @@ import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { RouterLink } from 'vue-router'
 
+defineProps<{
+  /** Shows only the account control on the mobile Stage. @default false */
+  compact?: boolean
+}>()
+
 const authStore = useAuthStore()
 const { isAuthenticated, user, credits } = storeToRefs(authStore)
 const { t } = useI18n()
@@ -31,6 +36,7 @@ const formattedCredits = computed(() => credits.value.toLocaleString())
     <!-- NOTICE: The avatar is stored in the localstorage, it will be shown at the first time of the page load, so we do not need the skeleton loading here -->
     <template v-if="!isAuthenticated">
       <RouterLink
+        v-if="!compact"
         border="2 solid neutral-100/60 dark:neutral-800/30"
         bg="neutral-50/70 dark:neutral-800/70"
         w-fit flex items-center justify-center rounded-xl p-2 backdrop-blur-md
@@ -41,6 +47,7 @@ const formattedCredits = computed(() => credits.value.toLocaleString())
       </RouterLink>
 
       <button
+        :class="compact ? ['min-h-11 min-w-11 focus-visible:outline-2 focus-visible:outline-primary-500'] : undefined"
         border="2 solid neutral-100/60 dark:neutral-800/30"
         bg="neutral-50/70 dark:neutral-800/70"
         w-fit flex items-center justify-center rounded-xl p-2 backdrop-blur-md
@@ -59,7 +66,8 @@ const formattedCredits = computed(() => credits.value.toLocaleString())
           type="button"
           :aria-label="userName || t('settings.pages.account.title')"
           :class="[
-            'group flex items-center gap-2 rounded-full border-2 p-1 pl-1 pr-3 outline-none backdrop-blur-md',
+            'group flex items-center gap-2 rounded-full border-2 p-1 outline-none backdrop-blur-md',
+            compact ? 'size-11 justify-center focus-visible:ring-2 focus-visible:ring-primary-500' : 'pl-1 pr-3',
             'border-neutral-100/60 bg-neutral-50/70 dark:border-neutral-800/30 dark:bg-neutral-800/70',
             'hover:bg-neutral-100 data-[state=open]:bg-neutral-100',
             'dark:hover:bg-neutral-800 dark:data-[state=open]:bg-neutral-800',
@@ -76,7 +84,7 @@ const formattedCredits = computed(() => credits.value.toLocaleString())
           />
 
           <span
-            v-if="userName"
+            v-if="userName && !compact"
             :class="[
               'max-w-[100px] hidden truncate text-sm font-medium sm:block',
               'text-neutral-700 dark:text-neutral-200',
@@ -85,6 +93,7 @@ const formattedCredits = computed(() => credits.value.toLocaleString())
             {{ userName }}
           </span>
           <div
+            v-if="!compact"
             :class="[
               'i-solar:alt-arrow-down-linear text-neutral-400',
               'transition-transform duration-200',
diff --git a/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/About.vue b/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/About.vue
index 1ea8c9b36..0c56cc380 100644
--- a/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/About.vue
+++ b/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/About.vue
@@ -2,12 +2,16 @@
 import { isStageCapacitor, isStageTamagotchi } from '@proj-airi/stage-shared'
 import { AboutContent, AboutDialog } from '@proj-airi/stage-ui/components'
 import { useBuildInfo } from '@proj-airi/stage-ui/composables'
-import { ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 
+defineProps<{
+  /** Lets a parent menu provide the trigger. @default false */
+  hideTrigger?: boolean
+}>()
+
 const { t } = useI18n()
 
-const show = ref(false)
+const show = defineModel<boolean>({ default: false })
 const buildInfo = useBuildInfo()
 
 const aboutLinks = [
@@ -25,6 +29,7 @@ const edition = isStageTamagotchi()
 
 <template>
   <button
+    v-if="!hideTrigger"
     title="About"
     :class="[
       'w-fit p-2',
diff --git a/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/ViewControls.vue b/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/ViewControls.vue
index db1338fdc..a4d6357d9 100644
--- a/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/ViewControls.vue
+++ b/packages/stage-layouts/src/components/Layouts/InteractiveArea/Actions/ViewControls.vue
@@ -2,7 +2,7 @@
 import { defaultControlConfig as threeCtrlConf, supportedControl as threeSupportedControl, useThreeViewControl } from '@proj-airi/stage-ui-three'
 import { defaultControlConfig as l2dCtrlConf, supportedControl as l2dSupportedCtrl, useL2dViewControl } from '@proj-airi/stage-ui/stores/live2d'
 import { useSettingsStageModel } from '@proj-airi/stage-ui/stores/settings/stage-model'
-import { Button } from '@proj-airi/ui'
+import { Button, GhostButton } from '@proj-airi/ui'
 import { storeToRefs } from 'pinia'
 import { computed } from 'vue'
 
@@ -29,9 +29,9 @@ function handleViewControlsToggle(targetMode: string) {
 </script>
 
 <template>
-  <div w-full flex flex-1 items-center self-end justify-end gap-2>
+  <div :class="['w-full flex items-center self-end justify-end gap-2', $slots.default ? 'flex-col' : 'flex-1']">
     <Transition name="fade">
-      <div v-if="controlEnabled?.enabled.value" w-full flex justify-between gap-2>
+      <div v-if="controlEnabled?.enabled.value" :class="['w-full flex justify-between gap-2', $slots.default && 'px-4 pb-4']">
         <Button
           v-for="control in controlEnabled.supported"
           :key="control"
@@ -45,7 +45,20 @@ function handleViewControlsToggle(targetMode: string) {
         </Button>
       </div>
     </Transition>
+    <GhostButton
+      v-if="$slots.default"
+      block size="unset"
+      :disabled="!controlEnabled"
+      :aria-expanded="controlEnabled?.enabled.value ?? false"
+      :class="['mobile-tool-row order-first min-h-15 rounded-none px-4 py-3']"
+      @click="controlEnabled && (controlEnabled.enabled.value = !controlEnabled.enabled.value)"
+    >
+      <span aria-hidden="true" :class="['i-solar:tuning-outline size-5 shrink-0 text-neutral-400']" />
+      <span :class="['flex-1 text-left text-sm']"><slot /></span>
+      <span aria-hidden="true" :class="['size-4 text-neutral-400', controlEnabled?.enabled.value ? 'i-solar:alt-arrow-up-outline' : 'i-solar:alt-arrow-down-outline']" />
+    </GhostButton>
     <button
+      v-else
       w-fit flex items-center self-end justify-center justify-self-end rounded-xl p-2 backdrop-blur-md
       border="2 solid neutral-100/60 dark:neutral-800/30" bg="neutral-50/70 dark:neutral-800/70" title="View"
       text="neutral-500 dark:neutral-400"
@@ -60,6 +73,11 @@ function handleViewControlsToggle(targetMode: string) {
 </template>
 
 <style scoped>
+.mobile-tool-row :deep(.basic-button-content) {
+  width: 100%;
+  gap: 0.75rem;
+}
+
 .fade-enter-active,
 .fade-leave-active {
   transition: opacity 0.2s ease-in-out;
diff --git a/packages/stage-layouts/src/components/Layouts/MobileHeader.vue b/packages/stage-layouts/src/components/Layouts/MobileHeader.vue
index 2e1447831..006f68b58 100644
--- a/packages/stage-layouts/src/components/Layouts/MobileHeader.vue
+++ b/packages/stage-layouts/src/components/Layouts/MobileHeader.vue
@@ -1,11 +1,11 @@
-<script setup lang="ts">
-import HeaderAvatar from './HeaderAvatar.vue'
-import MobileHeaderLink from './MobileHeaderLink.vue'
-</script>
-
 <template>
-  <header mb-1 w-full flex items-center justify-between gap-2 px-2>
-    <MobileHeaderLink />
-    <HeaderAvatar />
+  <header
+    :class="[
+      'pointer-events-none absolute inset-x-0 top-0 z-30',
+      'flex items-center justify-between',
+      'pl-[max(0.75rem,env(safe-area-inset-left))] pr-[max(0.75rem,env(safe-area-inset-right))] pt-[max(0.75rem,env(safe-area-inset-top))]',
+    ]"
+  >
+    <slot />
   </header>
 </template>
diff --git a/packages/stage-layouts/src/components/Layouts/MobileHeaderLink.vue b/packages/stage-layouts/src/components/Layouts/MobileHeaderLink.vue
deleted file mode 100644
index b2776f66c..000000000
--- a/packages/stage-layouts/src/components/Layouts/MobileHeaderLink.vue
+++ /dev/null
@@ -1,35 +0,0 @@
-<script setup lang="ts">
-import { useTheme } from '@proj-airi/ui'
-import { storeToRefs } from 'pinia'
-import { RouterLink } from 'vue-router'
-
-import LogoDark from '../../assets/logo-dark.svg'
-import Logo from '../../assets/logo.svg'
-
-import { BackgroundKind, useBackgroundStore } from '../../stores/background'
-
-const { isDark: dark } = useTheme()
-const { selectedOption } = storeToRefs(useBackgroundStore())
-</script>
-
-<template>
-  <RouterLink
-    to="/" flex="~" items-center
-    gap-2 px-2 text-nowrap text-2xl outline-none
-  >
-    <template v-if="selectedOption?.kind === BackgroundKind.Wave">
-      <template v-if="dark">
-        <img :src="LogoDark" h-8 w-8 class="theme-colored">
-      </template>
-      <template v-else>
-        <img :src="Logo" h-8 w-8 class="theme-colored">
-      </template>
-    </template>
-  </RouterLink>
-</template>
-
-<style scoped>
-.theme-colored {
-  filter: hue-rotate(calc(var(--chromatic-hue, 0) * 1deg));
-}
-</style>
diff --git a/packages/stage-layouts/src/components/Layouts/MobileInteractiveArea.vue b/packages/stage-layouts/src/components/Layouts/MobileInteractiveArea.vue
index 8a7d19333..24a53384c 100644
--- a/packages/stage-layouts/src/components/Layouts/MobileInteractiveArea.vue
+++ b/packages/stage-layouts/src/components/Layouts/MobileInteractiveArea.vue
@@ -4,45 +4,39 @@ import type { ChatHistoryItem } from '@proj-airi/stage-ui/types/chat'
 import { errorMessageFrom } from '@moeru/std'
 import { isStageTamagotchi } from '@proj-airi/stage-shared'
 import { useThreeViewControl } from '@proj-airi/stage-ui-three'
-import { ChatHistory, HearingConfigDialog } from '@proj-airi/stage-ui/components'
+import { CharacterSwitcherDrawer, ChatHistory } from '@proj-airi/stage-ui/components'
 import { ChatSessionsDrawer } from '@proj-airi/stage-ui/components/scenarios/chat'
 import { useAnalytics, useAudioAnalyzer } from '@proj-airi/stage-ui/composables'
 import { useAudioContext } from '@proj-airi/stage-ui/stores/audio'
 import { useChatStore } from '@proj-airi/stage-ui/stores/chat'
-import { useChatMaintenanceStore } from '@proj-airi/stage-ui/stores/chat/maintenance'
 import { useChatSessionStore } from '@proj-airi/stage-ui/stores/chat/session-store'
 import { useChatStreamStore } from '@proj-airi/stage-ui/stores/chat/stream-store'
 import { useL2dViewControl } from '@proj-airi/stage-ui/stores/live2d'
 import { useContextBridgeStore } from '@proj-airi/stage-ui/stores/mods/api/context-bridge'
 import { useSettings, useSettingsAudioDevice } from '@proj-airi/stage-ui/stores/settings'
-import { BasicTextarea, useTheme } from '@proj-airi/ui'
+import { BasicButton, BasicTextarea } from '@proj-airi/ui'
 import { onLongPress, useEventListener, usePointerSwipe } from '@vueuse/core'
 import { animate, spring } from 'animejs'
 import { storeToRefs } from 'pinia'
 import { computed, nextTick, onMounted, onUnmounted, shallowRef, useTemplateRef, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
-import { RouterLink } from 'vue-router'
 
-import ViewControls from '../Layouts/InteractiveArea/Actions/ViewControls.vue'
-import IndicatorMicVolume from '../Widgets/IndicatorMicVolume.vue'
-import ActionAbout from './InteractiveArea/Actions/About.vue'
+import MobileSettingsDrawer from './mobile-settings-drawer.vue'
+import MobileHeader from './MobileHeader.vue'
 
 import { useMobileInteractiveAreaLayout } from '../../composables/use-mobile-interactive-area-layout'
 import { useTranscriptions } from '../../composables/use-transcriptions'
 import { useChatToolCallRerun } from '../../composables/useChatToolCallRerun'
 import { useStopSpeakingButton } from '../../composables/useStopSpeakingButton'
-import { BackgroundDialogPicker } from '../Backgrounds'
 
 const emit = defineEmits<{
   /** Reports the stable height and offset that keep the Stage in the same screen position. */
   stageViewportChange: [viewport: { height: number, offsetTop: number }]
 }>()
 
-const { isDark, toggleDark } = useTheme()
 const chatOrchestrator = useChatStore()
 const chatSession = useChatSessionStore()
 const chatStream = useChatStreamStore()
-const { cleanupMessages } = useChatMaintenanceStore()
 const { activeSessionId, messages } = storeToRefs(chatSession)
 const { streamingMessage } = storeToRefs(chatStream)
 const { activeSendSessionId, activeStreamingMessage, sending } = storeToRefs(chatOrchestrator)
@@ -55,7 +49,7 @@ const isActiveSessionSending = computed(() => (
 const visibleStreamingMessage = computed(() => activeSendSessionId.value === activeSessionId.value
   ? activeStreamingMessage.value
   : streamingMessage.value)
-const { trackChatMessageDeleted, trackChatMessagesCleared } = useAnalytics()
+const { trackChatMessageDeleted } = useAnalytics()
 const { rerunToolCall } = useChatToolCallRerun()
 
 async function handleDeleteMessage(index: number) {
@@ -71,21 +65,11 @@ async function handleDeleteMessage(index: number) {
   })
 }
 
-function handleCleanupMessages() {
-  const messageCount = messages.value.filter(message => message.role !== 'system').length
-  cleanupMessages()
-  trackChatMessagesCleared({
-    source: 'chat_controls',
-    message_count: messageCount,
-  })
-}
-
 const messageInput = shallowRef('')
 const isComposing = shallowRef(false)
 const inputBubbleDocked = shallowRef(false)
 const inputBubbleDragging = shallowRef(false)
 const inputBubbleAnimating = shallowRef(false)
-const backgroundDialogOpen = shallowRef(false)
 const sessionsDrawerOpen = shallowRef(false)
 const mobileInteractiveArea = useTemplateRef<HTMLElement>('mobileInteractiveArea')
 const messageComposer = useTemplateRef<HTMLElement>('messageComposer')
@@ -163,7 +147,7 @@ const messageInputPointerEventsClass = computed(() => {
   return 'pointer-events-auto'
 })
 
-const { isListening, startStreamingTranscription, stopStreamingTranscription } = useTranscriptions(
+useTranscriptions(
   {
     messageInputRef: messageInput,
     sendMessage: handleSend,
@@ -171,7 +155,13 @@ const { isListening, startStreamingTranscription, stopStreamingTranscription } =
   },
 )
 const { showStopSpeakingButton, speechMuted, stopSpeakingFromChat, toggleSpeechMuted } = useStopSpeakingButton()
-const toggleTranscription = () => isListening.value ? stopStreamingTranscription() : startStreamingTranscription()
+const characterVoiceEnabled = computed({
+  get: () => !speechMuted.value,
+  set: (value) => {
+    if (value === speechMuted.value)
+      toggleSpeechMuted()
+  },
+})
 
 let suppressNextInputBubbleClick = false
 
@@ -399,7 +389,26 @@ onUnmounted(() => {
     :class="mobileInteractiveAreaClass"
     :style="mobileInteractiveAreaStyle"
   >
-    <BackgroundDialogPicker v-model="backgroundDialogOpen" class="pointer-events-auto" />
+    <MobileHeader>
+      <BasicButton
+        size="unset"
+        data-testid="conversation-selector-button"
+        :class="[
+          'pointer-events-auto size-11 shrink-0 rounded-full backdrop-blur-md',
+          'bg-neutral-50/70 text-neutral-600 dark:bg-neutral-900/70 dark:text-neutral-300',
+          'focus-visible:outline-2 focus-visible:outline-primary-500',
+        ]"
+        :title="t('stage.chat.sessions.title')"
+        :aria-label="t('stage.chat.sessions.title')"
+        aria-haspopup="dialog"
+        :aria-expanded="sessionsDrawerOpen"
+        @click="sessionsDrawerOpen = true"
+      >
+        <span aria-hidden="true" :class="['i-solar:dialog-2-outline size-6']" />
+      </BasicButton>
+      <CharacterSwitcherDrawer />
+      <MobileSettingsDrawer v-model:character-voice-enabled="characterVoiceEnabled" />
+    </MobileHeader>
     <div
       :class="[
         'min-h-0 flex flex-1 flex-col justify-end overflow-hidden',
@@ -451,84 +460,7 @@ onUnmounted(() => {
             data-testid="mobile-input-bubble-dock-target"
             class="invisible size-10 shrink-0 self-end"
           />
-          <ActionAbout />
-          <div flex="~ col" items-end gap-1>
-            <button
-              data-testid="conversation-selector-button"
-              border="2 solid neutral-100/60 dark:neutral-800/30"
-              bg="neutral-50/70 dark:neutral-800/70"
-              w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md
-              :title="t('stage.chat.sessions.title')"
-              :aria-label="t('stage.chat.sessions.title')"
-              @click="sessionsDrawerOpen = true"
-            >
-              <div i-solar:chat-line-bold-duotone size-5 text="neutral-500 dark:neutral-400" />
-            </button>
-            <button
-              data-testid="speech-mute-button"
-              :class="[
-                'w-fit flex items-center self-end justify-center rounded-xl border-2 border-solid p-2 backdrop-blur-md',
-                'border-neutral-100/60 text-neutral-500 transition-colors active:scale-95 dark:border-neutral-800/30 dark:text-neutral-400',
-                speechMuted
-                  ? 'bg-primary-100/80 text-primary-600 dark:bg-primary-900/60 dark:text-primary-300'
-                  : 'bg-neutral-50/70 hover:text-primary-500 dark:bg-neutral-800/70 dark:hover:text-primary-400',
-              ]"
-              :title="speechMuted ? t('stage.speech-output.unmute') : t('stage.speech-output.mute')"
-              :aria-label="speechMuted ? t('stage.speech-output.unmute') : t('stage.speech-output.mute')"
-              :aria-pressed="speechMuted"
-              @click="toggleSpeechMuted"
-            >
-              <div v-if="speechMuted" class="i-solar:volume-cross-bold-duotone size-5" />
-              <div v-else class="i-solar:volume-loud-bold-duotone size-5" />
-            </button>
-          </div>
           <ChatSessionsDrawer v-model="sessionsDrawerOpen" />
-          <HearingConfigDialog
-            v-model:enabled="enabled"
-            :transcription="isListening"
-            :toggle-transcription="toggleTranscription"
-            :granted="true"
-          >
-            <button
-              border="2 solid neutral-100/60 dark:neutral-800/30"
-              bg="neutral-50/70 dark:neutral-800/70"
-              w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md
-              title="Hearing"
-            >
-              <Transition name="fade" mode="out-in">
-                <IndicatorMicVolume v-if="enabled" size-5 :color-class="isListening ? undefined : 'text-neutral-500 dark:text-neutral-400'" />
-                <div v-else i-solar:microphone-3-outline size-5 text="neutral-500 dark:neutral-400" />
-              </Transition>
-            </button>
-          </HearingConfigDialog>
-          <button border="2 solid neutral-100/60 dark:neutral-800/30" bg="neutral-50/70 dark:neutral-800/70" w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md title="Theme" @click="toggleDark()">
-            <Transition name="fade" mode="out-in">
-              <div v-if="isDark" i-solar:moon-outline size-5 text="neutral-500 dark:neutral-400" />
-              <div v-else i-solar:sun-2-outline size-5 text="neutral-500 dark:neutral-400" />
-            </Transition>
-          </button>
-          <button border="2 solid neutral-100/60 dark:neutral-800/30" bg="neutral-50/70 dark:neutral-800/70" w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md title="Background" @click="backgroundDialogOpen = true">
-            <div i-solar:gallery-wide-bold-duotone size-5 text="neutral-500 dark:neutral-400" />
-          </button>
-          <!-- <button border="2 solid neutral-100/60 dark:neutral-800/30" bg="neutral-50/70 dark:neutral-800/70" w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md title="Language">
-            <div i-solar:earth-outline size-5 text="neutral-500 dark:neutral-400" />
-          </button> -->
-          <RouterLink to="/settings" border="2 solid neutral-100/60 dark:neutral-800/30" bg="neutral-50/70 dark:neutral-800/70" w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md title="Settings">
-            <div i-solar:settings-outline size-5 text="neutral-500 dark:neutral-400" />
-          </RouterLink>
-          <!-- <button border="2 solid neutral-100/60 dark:neutral-800/30" bg="neutral-50/70 dark:neutral-800/70" w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md title="Model">
-            <div i-solar:face-scan-circle-outline size-5 text="neutral-500 dark:neutral-400" />
-          </button> -->
-          <button
-            border="2 solid neutral-100/60 dark:neutral-800/30"
-            bg="neutral-50/70 dark:neutral-800/70"
-            w-fit flex items-center self-end justify-center rounded-xl p-2 backdrop-blur-md
-            title="Cleanup Messages"
-            @click="handleCleanupMessages"
-          >
-            <div class="i-solar:trash-bin-2-bold-duotone" />
-          </button>
-          <ViewControls />
         </div>
       </div>
       <div
@@ -536,7 +468,7 @@ onUnmounted(() => {
         data-testid="mobile-message-composer"
         :class="[
           'max-h-100dvh max-w-100dvw w-full',
-          'flex gap-1 px-3 pt-2',
+          'flex gap-2 px-3 pt-2',
         ]"
         :style="messageComposerStyle"
       >
@@ -545,7 +477,7 @@ onUnmounted(() => {
           data-testid="mobile-input-bubble"
           :data-dragging="inputBubbleDragging"
           :class="[
-            'group relative mx-auto min-h-10 flex origin-center',
+            'group relative mx-auto min-h-10 flex items-end origin-center',
             'touch-none select-none focus-within:touch-auto focus-within:select-text',
             inputBubbleDragging || inputBubbleAnimating
               ? 'transition-none'
diff --git a/packages/stage-layouts/src/components/Layouts/mobile-settings-drawer.vue b/packages/stage-layouts/src/components/Layouts/mobile-settings-drawer.vue
new file mode 100644
index 000000000..a8c5d5cb7
--- /dev/null
+++ b/packages/stage-layouts/src/components/Layouts/mobile-settings-drawer.vue
@@ -0,0 +1,197 @@
+<script setup lang="ts">
+import { HearingConfig } from '@proj-airi/stage-ui/components'
+import { useAuthStore } from '@proj-airi/stage-ui/stores/auth'
+import { useSettingsAudioDevice } from '@proj-airi/stage-ui/stores/settings'
+import { Avatar, BasicButton, BottomDrawer, Checkbox, GhostButton, useTheme } from '@proj-airi/ui'
+import { storeToRefs } from 'pinia'
+import { shallowRef, watch } from 'vue'
+import { useI18n } from 'vue-i18n'
+import { RouterLink, useRouter } from 'vue-router'
+
+import ActionAbout from './InteractiveArea/Actions/About.vue'
+import ViewControls from './InteractiveArea/Actions/ViewControls.vue'
+
+import { BackgroundDialogPicker } from '../Backgrounds'
+
+const characterVoiceEnabled = defineModel<boolean>('characterVoiceEnabled', { required: true })
+const { t } = useI18n()
+const { isDark } = useTheme()
+const authStore = useAuthStore()
+const { isAuthenticated, user } = storeToRefs(authStore)
+const router = useRouter()
+const settingsAudioDevice = useSettingsAudioDevice()
+const hearingOpen = shallowRef(false)
+const backgroundDialogOpen = shallowRef(false)
+const settingsOpen = shallowRef(false)
+const aboutOpen = shallowRef(false)
+// Finish closing settings before opening a sibling modal, so focus and scroll locks have one owner.
+const nextPanel = shallowRef<'background' | 'about' | 'account' | 'hearing'>()
+
+function openPanel(panel: 'background' | 'about' | 'account' | 'hearing') {
+  nextPanel.value = panel
+  settingsOpen.value = false
+}
+
+function finishSettingsClose() {
+  if (nextPanel.value === 'background') {
+    backgroundDialogOpen.value = true
+  }
+  else if (nextPanel.value === 'about') {
+    aboutOpen.value = true
+  }
+  else if (nextPanel.value === 'hearing') {
+    hearingOpen.value = true
+  }
+  else if (nextPanel.value === 'account') {
+    if (isAuthenticated.value)
+      void router.push('/settings/account')
+    else
+      authStore.needsLogin = true
+  }
+  nextPanel.value = undefined
+}
+
+watch(hearingOpen, async (open) => {
+  if (open)
+    await settingsAudioDevice.askPermission()
+})
+</script>
+
+<template>
+  <BottomDrawer
+    v-model="settingsOpen"
+    :title="t('stage.mobile-tools.title')"
+    @after-close="finishSettingsClose"
+    @close-auto-focus="event => { if (nextPanel) event.preventDefault() }"
+  >
+    <template #trigger>
+      <BasicButton
+        size="unset"
+        :aria-label="t('stage.mobile-tools.title')"
+        :title="t('stage.mobile-tools.title')"
+        data-testid="mobile-settings-button"
+        :class="['pointer-events-auto size-11 rounded-full bg-neutral-50/70 text-neutral-600 backdrop-blur-md dark:bg-neutral-900/70 dark:text-neutral-300', 'focus-visible:outline-2 focus-visible:outline-primary-500']"
+      >
+        <span aria-hidden="true" :class="['i-solar:settings-outline size-6']" />
+      </BasicButton>
+    </template>
+    <GhostButton
+      block size="unset"
+      :class="[
+        'mobile-tool-row rounded-2xl',
+        '[&_.basic-button-content]:w-full [&_.basic-button-content]:gap-3 [&_[aria-hidden]]:shrink-0',
+        isAuthenticated ? 'mobile-tool-row-authenticated mb-4 min-h-16' : 'mobile-tool-row-anonymous mb-3 min-h-14',
+      ]"
+      @click="openPanel('account')"
+    >
+      <Avatar v-if="isAuthenticated" :src="user?.image" :class="['size-12 shrink-0 rounded-full bg-neutral-200 text-neutral-500 dark:bg-neutral-700']" />
+      <span :class="['min-w-0 flex-1 text-left']">
+        <span :class="['block truncate text-base font-semibold']">{{ isAuthenticated ? user?.name : t('stage.mobile-tools.sign-in') }}</span>
+        <span :class="['block text-xs text-neutral-500 dark:text-neutral-400']">{{ t('stage.mobile-tools.account-description') }}</span>
+      </span>
+      <span aria-hidden="true" :class="['i-solar:alt-arrow-right-outline size-4 shrink-0 text-neutral-400']" />
+    </GhostButton>
+    <section :class="['mb-4']">
+      <h3 :class="['mb-2 px-1 text-xs font-semibold text-neutral-500 dark:text-neutral-400']">
+        {{ t('stage.mobile-tools.appearance') }}
+      </h3>
+      <div :class="['overflow-hidden rounded-2xl bg-white dark:bg-neutral-800/60']">
+        <label :class="['min-h-13 flex cursor-pointer items-center gap-3 px-4 py-3']">
+          <span aria-hidden="true" :class="['i-solar:moon-outline size-5 shrink-0 text-neutral-400']" />
+          <span :class="['flex-1 text-sm']">{{ t('stage.mobile-tools.dark-mode') }}</span>
+          <Checkbox v-model="isDark" :aria-label="t('stage.mobile-tools.dark-mode')" />
+        </label>
+        <div :class="['mx-4 border-t border-neutral-100 dark:border-neutral-700/50']" />
+        <GhostButton
+          block size="unset"
+          :class="['mobile-tool-row min-h-13 rounded-none px-4 py-3']"
+          @click="openPanel('background')"
+        >
+          <span aria-hidden="true" :class="['i-solar:gallery-wide-outline size-5 shrink-0 text-neutral-400']" />
+          <span :class="['flex-1 text-left text-sm']">{{ t('stage.mobile-tools.background') }}</span>
+          <span aria-hidden="true" :class="['i-solar:alt-arrow-right-outline size-4 text-neutral-400']" />
+        </GhostButton>
+        <div :class="['mx-4 border-t border-neutral-100 dark:border-neutral-700/50']" />
+        <ViewControls>
+          {{ t('stage.mobile-tools.view') }}
+        </ViewControls>
+      </div>
+    </section>
+    <section :class="['mb-4']">
+      <h3 :class="['mb-2 px-1 text-xs font-semibold text-neutral-500 dark:text-neutral-400']">
+        {{ t('stage.mobile-tools.sound') }}
+      </h3>
+      <div :class="['overflow-hidden rounded-2xl bg-white dark:bg-neutral-800/60']">
+        <label :class="['min-h-13 flex cursor-pointer items-center gap-3 px-4 py-3']">
+          <span aria-hidden="true" :class="['i-solar:volume-loud-outline size-5 shrink-0 text-neutral-400']" />
+          <span :class="['flex-1 text-sm']">{{ t('stage.mobile-tools.character-voice') }}</span>
+          <Checkbox v-model="characterVoiceEnabled" :aria-label="t('stage.mobile-tools.character-voice')" />
+        </label>
+        <div :class="['mx-4 border-t border-neutral-100 dark:border-neutral-700/50']" />
+        <GhostButton block size="unset" :class="['mobile-tool-row min-h-13 rounded-none px-4 py-3']" @click="openPanel('hearing')">
+          <span aria-hidden="true" :class="['i-solar:microphone-3-outline size-5 shrink-0 text-neutral-400']" />
+          <span :class="['flex-1 text-left text-sm']">{{ t('stage.mobile-tools.hearing') }}</span>
+          <span aria-hidden="true" :class="['i-solar:alt-arrow-right-outline size-4 text-neutral-400']" />
+        </GhostButton>
+      </div>
+    </section>
+    <section :class="['mb-4']">
+      <h3 :class="['mb-2 px-1 text-xs font-semibold text-neutral-500 dark:text-neutral-400']">
+        {{ t('stage.mobile-tools.application') }}
+      </h3>
+      <div :class="['overflow-hidden rounded-2xl bg-white dark:bg-neutral-800/60']">
+        <RouterLink
+          to="/settings"
+          :class="[
+            'min-h-13 flex items-center gap-3 px-4 py-3 text-sm',
+            'hover:bg-primary-500/10 focus-visible:outline-2 focus-visible:outline-primary-500',
+          ]"
+          @click="settingsOpen = false"
+        >
+          <span aria-hidden="true" :class="['i-solar:settings-outline size-5 shrink-0 text-neutral-400']" />
+          <span :class="['flex-1']">{{ t('stage.mobile-tools.settings') }}</span>
+          <span aria-hidden="true" :class="['i-solar:alt-arrow-right-outline size-4 text-neutral-400']" />
+        </RouterLink>
+        <div :class="['mx-4 border-t border-neutral-100 dark:border-neutral-700/50']" />
+        <GhostButton
+          block size="unset"
+          :class="['mobile-tool-row min-h-13 rounded-none px-4 py-3']"
+          @click="openPanel('about')"
+        >
+          <span aria-hidden="true" :class="['i-solar:info-circle-outline size-5 text-neutral-400']" />
+          <span :class="['flex-1 text-left text-sm']">{{ t('stage.mobile-tools.about') }}</span>
+          <span aria-hidden="true" :class="['i-solar:alt-arrow-right-outline size-4 text-neutral-400']" />
+        </GhostButton>
+      </div>
+    </section>
+  </BottomDrawer>
+  <BottomDrawer
+    v-model="hearingOpen"
+    :title="t('stage.mobile-tools.hearing')"
+    @close-auto-focus="event => event.preventDefault()"
+    @after-close="settingsOpen = true"
+  >
+    <HearingConfig :granted="true" />
+  </BottomDrawer>
+  <BackgroundDialogPicker v-model="backgroundDialogOpen" class="pointer-events-auto" />
+  <ActionAbout v-model="aboutOpen" hide-trigger />
+</template>
+
+<style scoped>
+.mobile-tool-row :deep(.basic-button-content) {
+  width: 100%;
+  gap: 0.75rem;
+}
+
+.mobile-tool-row :deep([aria-hidden]) {
+  flex-shrink: 0;
+}
+
+.mobile-tool-row.mobile-tool-row-authenticated {
+  padding: 0.75rem 1rem !important;
+}
+
+.mobile-tool-row.mobile-tool-row-anonymous {
+  padding: 0.5rem 0 !important;
+}
+</style>
diff --git a/packages/stage-layouts/src/components/Widgets/ChatActionButtons.vue b/packages/stage-layouts/src/components/Widgets/ChatActionButtons.vue
index 314551c0b..20f8c8db0 100644
--- a/packages/stage-layouts/src/components/Widgets/ChatActionButtons.vue
+++ b/packages/stage-layouts/src/components/Widgets/ChatActionButtons.vue
@@ -1,10 +1,6 @@
 <script setup lang="ts">
 import { ChatSessionsDrawer } from '@proj-airi/stage-ui/components/scenarios/chat'
-import { useAnalytics } from '@proj-airi/stage-ui/composables/use-analytics'
-import { useChatMaintenanceStore } from '@proj-airi/stage-ui/stores/chat/maintenance'
-import { useChatSessionStore } from '@proj-airi/stage-ui/stores/chat/session-store'
 import { useTheme } from '@proj-airi/ui'
-import { storeToRefs } from 'pinia'
 import { ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 
@@ -13,24 +9,12 @@ import ViewControls from '../Layouts/InteractiveArea/Actions/ViewControls.vue'
 import { useStopSpeakingButton } from '../../composables/useStopSpeakingButton'
 import { BackgroundDialogPicker } from '../Backgrounds'
 
-const { cleanupMessages } = useChatMaintenanceStore()
-const { messages } = storeToRefs(useChatSessionStore())
-const { trackChatMessagesCleared } = useAnalytics()
 const { isDark, toggleDark } = useTheme()
 const { speechMuted, toggleSpeechMuted } = useStopSpeakingButton()
 const { t } = useI18n()
 
 const backgroundDialogOpen = ref(false)
 const sessionsDrawerOpen = ref(false)
-
-function handleCleanupMessages() {
-  const messageCount = messages.value.filter(message => message.role !== 'system').length
-  cleanupMessages()
-  trackChatMessagesCleared({
-    source: 'chat_controls',
-    message_count: messageCount,
-  })
-}
 </script>
 
 <template>
@@ -70,18 +54,6 @@ function handleCleanupMessages() {
       </button>
     </div>
     <ViewControls />
-    <button
-      class="max-h-[10lh] min-h-[1lh]"
-      bg="neutral-100 dark:neutral-800"
-      text="lg neutral-500 dark:neutral-400"
-      hover:text="red-500 dark:red-400"
-      flex items-center justify-center rounded-md p-2 outline-none
-      transition-colors transition-transform active:scale-95
-      @click="handleCleanupMessages"
-    >
-      <div class="i-solar:trash-bin-2-bold-duotone" />
-    </button>
-
     <button
       class="max-h-[10lh] min-h-[1lh]"
       bg="neutral-100 dark:neutral-800"
diff --git a/packages/stage-ui/src/components/misc/character-switcher-drawer.browser.test.ts b/packages/stage-ui/src/components/misc/character-switcher-drawer.browser.test.ts
new file mode 100644
index 000000000..328b1737d
--- /dev/null
+++ b/packages/stage-ui/src/components/misc/character-switcher-drawer.browser.test.ts
@@ -0,0 +1,94 @@
+import type { AiriCard } from '../../types/airiCard'
+
+import { PiniaColada } from '@pinia/colada'
+import { createPinia } from 'pinia'
+import { expect, it } from 'vitest'
+import { render } from 'vitest-browser-vue'
+import { page, userEvent } from 'vitest/browser'
+import { defineComponent } from 'vue'
+import { createI18n } from 'vue-i18n'
+import { createMemoryHistory, createRouter } from 'vue-router'
+
+import CharacterSwitcherDrawer from './character-switcher-drawer.vue'
+
+import { useAiriCardStore } from '../../stores/modules/airi-card'
+
+import '@unocss/reset/tailwind.css'
+import 'virtual:uno.css'
+
+function card(name: string): AiriCard {
+  return {
+    name,
+    version: '1.0.0',
+    extensions: {
+      airi: {
+        agents: {},
+        modules: {
+          consciousness: { provider: '', model: '' },
+          speech: { provider: '', model: '', voice_id: '' },
+          vision: { provider: '', model: '' },
+        },
+      },
+    },
+  }
+}
+
+async function mountSwitcher(name = 'ReLU') {
+  const pinia = createPinia()
+  pinia.state.value['airi-card'] = {
+    cards: new Map([['default', card(name)], ['second', card('Hiyori')]]),
+    activeCardId: 'default',
+  }
+  const router = createRouter({
+    history: createMemoryHistory(),
+    routes: [{ path: '/', component: { template: '<div />' } }, { path: '/settings/airi-card', component: { template: '<div />' } }],
+  })
+  await router.push('/')
+  const screen = await render(defineComponent({
+    components: { CharacterSwitcherDrawer },
+    setup() {
+      void useAiriCardStore().initialize()
+    },
+    template: '<header style="display:flex;width:100%"><span style="width:44px;flex-shrink:0" /><CharacterSwitcherDrawer /><span style="width:44px;flex-shrink:0" /></header>',
+  }), {
+    global: {
+      plugins: [pinia, PiniaColada, router, createI18n({
+        legacy: false,
+        locale: 'en',
+        missingWarn: false,
+        fallbackWarn: false,
+        messages: { en: { stage: { 'character-switcher': { title: 'Switch character', manage: 'Manage characters', empty: 'No characters yet', failed: 'Could not switch characters' } } } },
+      })],
+    },
+  })
+  return { screen, router, store: useAiriCardStore(pinia) }
+}
+
+it('selects a character through the real store and opens character management', async () => {
+  await page.viewport(390, 844)
+  const { screen, store, router } = await mountSwitcher()
+  await screen.getByTestId('character-selector-button').click()
+  await expect.poll(() => page.getByRole('dialog').element().getBoundingClientRect().height).toBeGreaterThanOrEqual(422)
+  await expect.element(page.getByRole('button', { name: 'ReLU', exact: true })).toHaveAttribute('aria-pressed', 'true')
+  expect(document.querySelector('[data-vaul-handle]')).not.toBeNull()
+  await page.getByRole('button', { name: 'Hiyori', exact: true }).click()
+  await expect.poll(() => store.activeCardId).toBe('second')
+  await expect.element(screen.getByTestId('character-selector-button')).toHaveTextContent('Hiyori')
+  await expect.element(page.getByRole('dialog')).not.toBeInTheDocument()
+  await screen.getByTestId('character-selector-button').click()
+  await page.getByRole('button', { name: 'Manage characters' }).click()
+  await expect.poll(() => router.currentRoute.value.path).toBe('/settings/airi-card')
+})
+
+it('truncates long titles and restores trigger focus on dismissal', async () => {
+  await page.viewport(320, 640)
+  const { screen, store } = await mountSwitcher('A very long character name that must not move the settings button')
+  const trigger = screen.getByTestId('character-selector-button')
+  expect(document.documentElement.scrollWidth).toBeLessThanOrEqual(320)
+  expect(trigger.element().getBoundingClientRect().height).toBeGreaterThanOrEqual(44)
+  await trigger.click()
+  await userEvent.keyboard('{Escape}')
+  await expect.element(page.getByRole('dialog')).not.toBeInTheDocument()
+  await expect.element(trigger).toHaveFocus()
+  expect(store.activeCardId).toBe('default')
+})
diff --git a/packages/stage-ui/src/components/misc/character-switcher-drawer.vue b/packages/stage-ui/src/components/misc/character-switcher-drawer.vue
new file mode 100644
index 000000000..aae40d489
--- /dev/null
+++ b/packages/stage-ui/src/components/misc/character-switcher-drawer.vue
@@ -0,0 +1,132 @@
+<script setup lang="ts">
+import { Avatar, BasicButton, BottomDrawer, GhostButton } from '@proj-airi/ui'
+import { storeToRefs } from 'pinia'
+import { computed, shallowRef } from 'vue'
+import { useI18n } from 'vue-i18n'
+import { useRouter } from 'vue-router'
+
+import { useDisplayModelsStore } from '../../stores/display-models'
+import { useAiriCardStore } from '../../stores/modules/airi-card'
+
+const { t } = useI18n()
+const router = useRouter()
+const cardStore = useAiriCardStore()
+const { cards, activeCard, activeCardId } = storeToRefs(cardStore)
+const { displayModels } = storeToRefs(useDisplayModelsStore())
+const open = shallowRef(false)
+const switching = shallowRef(false)
+const failed = shallowRef(false)
+const manageAfterClose = shallowRef(false)
+const entries = computed(() => Array.from(cards.value, ([id, card]) => ({
+  id,
+  name: card.name,
+  preview: displayModels.value.find(model => model.id === card.extensions.airi.modules.displayModelId)?.previewImage,
+})))
+
+async function selectCharacter(id: string) {
+  if (switching.value)
+    return
+  if (id === activeCardId.value) {
+    open.value = false
+    return
+  }
+  switching.value = true
+  failed.value = false
+  try {
+    if (await cardStore.activateCard(id))
+      open.value = false
+    else
+      failed.value = true
+  }
+  catch {
+    failed.value = true
+  }
+  finally {
+    switching.value = false
+  }
+}
+
+function manageCharacters() {
+  // Let the drawer release its focus and scroll locks before changing routes.
+  manageAfterClose.value = true
+  open.value = false
+}
+
+function finishClose() {
+  failed.value = false
+  if (manageAfterClose.value) {
+    manageAfterClose.value = false
+    void router.push('/settings/airi-card')
+  }
+}
+</script>
+
+<template>
+  <div :class="['min-w-0 flex flex-1 justify-center px-2']">
+    <BottomDrawer
+      v-model="open"
+      :title="t('stage.character-switcher.title')"
+      minimum-height="half"
+      @after-close="finishClose"
+      @close-auto-focus="event => { if (manageAfterClose) event.preventDefault() }"
+    >
+      <template #trigger>
+        <BasicButton
+          size="unset"
+          data-testid="character-selector-button"
+          :aria-label="`${t('stage.character-switcher.title')}: ${activeCard?.name ?? t('stage.character-switcher.empty')}`"
+          :title="activeCard?.name"
+          :class="[
+            'pointer-events-auto h-11 min-w-0 max-w-full rounded-full px-3',
+            'text-neutral-700 dark:text-neutral-200',
+            'focus-visible:outline-2 focus-visible:outline-primary-500',
+            '[&_.basic-button-content]:min-w-0',
+          ]"
+        >
+          <span :class="['truncate text-base font-semibold']">{{ activeCard?.name ?? t('stage.character-switcher.empty') }}</span>
+          <span aria-hidden="true" :class="['i-solar:alt-arrow-down-outline size-4 shrink-0']" />
+        </BasicButton>
+      </template>
+      <div :class="['grid grid-cols-2 gap-3']">
+        <BasicButton
+          v-for="entry in entries"
+          :key="entry.id"
+          size="unset"
+          :aria-pressed="entry.id === activeCardId"
+          :aria-label="entry.name"
+          :disabled="switching"
+          :class="[
+            'relative min-w-0 rounded-2xl border border-solid p-2',
+            '[&_.basic-button-content]:w-full [&_.basic-button-content]:min-w-0 [&_.basic-button-content]:flex-col',
+            'focus-visible:outline-2 focus-visible:outline-primary-500',
+            entry.id === activeCardId ? 'border-primary-500 bg-primary-50 dark:bg-primary-950' : 'border-neutral-200 dark:border-neutral-700',
+          ]"
+          @click="selectCharacter(entry.id)"
+        >
+          <Avatar :src="entry.preview" :class="['aspect-[4/3] w-full rounded-xl bg-neutral-100 text-neutral-400 dark:bg-neutral-800']">
+            <template #fallback>
+              <span aria-hidden="true" :class="['i-solar:user-rounded-outline size-10']" />
+            </template>
+          </Avatar>
+          <span :class="['w-full truncate text-sm']" :title="entry.name">{{ entry.name }}</span>
+          <span v-if="entry.id === activeCardId" aria-hidden="true" :class="['i-solar:check-circle-bold absolute right-3 top-3 size-6 text-primary-500']" />
+        </BasicButton>
+      </div>
+      <p v-if="!entries.length" :class="['py-8 text-center text-neutral-500']">
+        {{ t('stage.character-switcher.empty') }}
+      </p>
+      <p v-if="failed" role="alert" :class="['mt-3 text-sm text-red-600 dark:text-red-400']">
+        {{ t('stage.character-switcher.failed') }}
+      </p>
+      <GhostButton
+        block size="unset" :disabled="switching"
+        :class="['mt-4 min-h-11 rounded-xl px-3 [&_.basic-button-content]:w-full']"
+        @click="manageCharacters"
+      >
+        <span aria-hidden="true" :class="['i-solar:users-group-rounded-outline size-5 shrink-0']" />
+        <span :class="['flex-1 text-left']">{{ t('stage.character-switcher.manage') }}</span>
+        <span aria-hidden="true" :class="['i-solar:alt-arrow-right-outline size-4']" />
+      </GhostButton>
+    </BottomDrawer>
+  </div>
+</template>
diff --git a/packages/stage-ui/src/components/misc/index.ts b/packages/stage-ui/src/components/misc/index.ts
index a4843fc36..672526728 100644
--- a/packages/stage-ui/src/components/misc/index.ts
+++ b/packages/stage-ui/src/components/misc/index.ts
@@ -1,4 +1,5 @@
 export { default as Alert } from './alert.vue'
+export { default as CharacterSwitcherDrawer } from './character-switcher-drawer.vue'
 export { default as ErrorContainer } from './error-container.vue'
 export { default as ProfileSwitcherPopover } from './profile-switcher-popover.vue'
 export type { Props as ProfileSwitcherPopoverProps } from './profile-switcher-popover.vue'
diff --git a/packages/stage-ui/src/components/misc/mobile-composer-height.browser.test.ts b/packages/stage-ui/src/components/misc/mobile-composer-height.browser.test.ts
new file mode 100644
index 000000000..9483d9d30
--- /dev/null
+++ b/packages/stage-ui/src/components/misc/mobile-composer-height.browser.test.ts
@@ -0,0 +1,37 @@
+import { BasicTextarea } from '@proj-airi/ui'
+import { expect, it } from 'vitest'
+import { render } from 'vitest-browser-vue'
+import { page } from 'vitest/browser'
+import { defineComponent } from 'vue'
+
+it('keeps a mobile composer on one line until its content wraps', async () => {
+  // ROOT CAUSE:
+  // Resetting height to auto measured the native two-row minimum, so typing
+  // one character changed the mobile textarea from 32px to 56px.
+  // Even rows=1 still measured the flex parent's 40px minimum. Measure from
+  // the configured single-line height instead of the stretched auto height.
+  render(defineComponent({
+    components: { BasicTextarea },
+    template: `<div style="display:flex;min-height:40px">
+      <BasicTextarea aria-label="Message" default-height="1lh"
+        style="box-sizing:border-box;width:300px;font-size:16px;line-height:24px;padding:2px 16px;border:2px solid;min-height:32px" />
+    </div>`,
+  }))
+  const input = page.getByRole('textbox', { name: 'Message' })
+  const element = input.element()
+  await expect.poll(() => element.getBoundingClientRect().height).toBe(32)
+  await input.fill('a')
+  await expect.poll(() => element.style.height).toBe('32px')
+  expect(element.getBoundingClientRect().height).toBe(32)
+  await input.fill('你好')
+  await expect.poll(() => element.style.height).toBe('32px')
+  expect(element.getBoundingClientRect().height).toBe(32)
+  await input.fill('First line\nSecond line')
+  await expect.poll(() => element.getBoundingClientRect().height).toBe(56)
+  await input.fill('A long message '.repeat(12))
+  await expect.poll(() => element.getBoundingClientRect().height).toBeGreaterThan(56)
+  await input.fill('short')
+  await expect.poll(() => element.getBoundingClientRect().height).toBe(32)
+  await input.fill('')
+  await expect.poll(() => element.getBoundingClientRect().height).toBe(32)
+})
diff --git a/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.browser.test.ts b/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.browser.test.ts
index 21167397a..4df17a6fc 100644
--- a/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.browser.test.ts
+++ b/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.browser.test.ts
@@ -2,11 +2,15 @@ import type { ChatSessionMeta } from '../../../../types/chat-session'
 
 import { describe, expect, it } from 'vitest'
 import { render } from 'vitest-browser-vue'
+import { page } from 'vitest/browser'
 import { defineComponent, ref } from 'vue'
 import { createI18n } from 'vue-i18n'
 
 import SessionsDialog from './sessions-dialog.vue'
 
+import '@unocss/reset/tailwind.css'
+import 'virtual:uno.css'
+
 function createTestI18n() {
   return createI18n({
     legacy: false,
@@ -20,6 +24,9 @@ function createTestI18n() {
               'new': 'New chat',
               'empty': 'No chats',
               'delete': 'Delete',
+              'current': 'Current',
+              'cancel': 'Cancel',
+              'confirm-delete': 'Delete this conversation and its messages?',
               'cloud-badge': 'Cloud synced',
             },
           },
@@ -42,7 +49,7 @@ function sessionMeta(sessionId: string, updatedAt: number): ChatSessionMeta {
 function createHarness(rows = [
   { meta: sessionMeta('session-one', 2), preview: 'First chat', isActive: true, updatedAtLabel: 'now' },
   { meta: sessionMeta('session-two', 1), preview: 'Second chat', isActive: false, updatedAtLabel: 'yesterday' },
-]) {
+], isDesktop = false) {
   return defineComponent({
     name: 'SessionsDialogHarness',
     components: { SessionsDialog },
@@ -56,15 +63,15 @@ function createHarness(rows = [
         deleted,
         selected,
         rows,
+        isDesktop,
       }
     },
     template: `
       <SessionsDialog
         :open="true"
         :rows="rows"
-        :is-desktop="false"
+        :is-desktop="isDesktop"
         :is-creating-session="false"
-        mobile-padding-bottom="24px"
         @new-session="created += 1"
         @select-session="selected = $event"
         @delete-session="deleted = $event"
@@ -77,7 +84,37 @@ function createHarness(rows = [
 }
 
 describe('sessions dialog actions', () => {
+  it('keeps the current marker and deletion confirmation usable at 320 pixels', async () => {
+    await page.viewport(320, 740)
+    const screen = await render(createHarness(), { global: { plugins: [createTestI18n()] } })
+    await expect.poll(() => screen.getByRole('dialog').element().getBoundingClientRect().height).toBeGreaterThanOrEqual(370)
+    const current = screen.getByRole('button', { name: /^First chat/ })
+    await expect.element(current).toHaveAttribute('aria-current', 'true')
+    const remove = screen.getByRole('button', { name: 'Delete: Second chat' })
+    expect(remove.element().getBoundingClientRect().width).toBeGreaterThanOrEqual(44)
+    expect(remove.element().getBoundingClientRect().height).toBeGreaterThanOrEqual(44)
+    await remove.click()
+    await expect.element(screen.getByRole('status')).toHaveTextContent('Delete this conversation and its messages?')
+    await expect.element(screen.getByLabelText('deleted-session-id')).toHaveTextContent('none')
+    await screen.getByRole('button', { name: 'Cancel', exact: true }).click()
+    await expect.element(remove).toHaveFocus()
+    await expect.element(screen.getByRole('status')).not.toBeInTheDocument()
+    expect(document.documentElement.scrollWidth).toBeLessThanOrEqual(320)
+    expect(document.querySelector('[data-vaul-handle]')).not.toBeNull()
+  })
+
+  it('keeps the desktop surface centered and its list actions accessible', async () => {
+    await page.viewport(1280, 900)
+    const screen = await render(createHarness(undefined, true), { global: { plugins: [createTestI18n()] } })
+    const dialog = screen.getByRole('dialog').element()
+    await expect.poll(() => Math.round(dialog.getBoundingClientRect().x + dialog.getBoundingClientRect().width / 2)).toBe(640)
+    expect(document.querySelector('[data-vaul-handle]')).toBeNull()
+    await screen.getByRole('button', { name: /^Second chat/ }).click()
+    await expect.element(screen.getByLabelText('selected-session-id')).toHaveTextContent('session-two')
+  })
+
   it('constrains long mobile session lists to a scrollable viewport', async () => {
+    await page.viewport(390, 844)
     const rows = Array.from({ length: 30 }, (_, index) => ({
       meta: sessionMeta(`session-${index}`, 30 - index),
       preview: `Chat ${index}`,
@@ -107,8 +144,8 @@ describe('sessions dialog actions', () => {
     //
     // Vaul handled every pointer release on DrawerContent, including releases
     // from its action buttons, and unmounted the sheet before `click` ran.
-    // The replacement uses a Reka dialog surface whose buttons emit one action
-    // each without a competing gesture-release lifecycle.
+    // The shared drawer restricts dragging to its handle. List actions must
+    // still emit once without a competing gesture-release lifecycle.
     const screen = await render(createHarness(), {
       global: {
         plugins: [createTestI18n()],
@@ -121,10 +158,12 @@ describe('sessions dialog actions', () => {
     await expect.element(screen.getByLabelText('created-session-count')).toHaveTextContent('1')
 
     await screen.getByRole('button', { name: 'Delete: Second chat' }).click()
+    await expect.element(screen.getByLabelText('deleted-session-id')).toHaveTextContent('none')
+    await screen.getByRole('button', { name: 'Delete', exact: true }).click()
     await expect.element(screen.getByLabelText('deleted-session-id')).toHaveTextContent('session-two')
     await expect.element(screen.getByLabelText('selected-session-id')).toHaveTextContent('none')
 
-    await screen.getByRole('button', { name: 'First chat now' }).click()
+    await screen.getByRole('button', { name: /^First chat/ }).click()
     await expect.element(screen.getByLabelText('selected-session-id')).toHaveTextContent('session-one')
   })
 })
diff --git a/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.vue b/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.vue
index adc15f908..9d020ed97 100644
--- a/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.vue
+++ b/packages/stage-ui/src/components/scenarios/chat/components/sessions-dialog.vue
@@ -1,26 +1,18 @@
 <script setup lang="ts">
-import type { ChatSessionMeta } from '../../../../types/chat-session'
+import type { SessionRow } from './sessions-list.vue'
 
-import { ScrollableArea } from '@proj-airi/ui'
+import { BottomDrawer } from '@proj-airi/ui'
 import { DialogContent, DialogOverlay, DialogPortal, DialogRoot, DialogTitle } from 'reka-ui'
 import { useI18n } from 'vue-i18n'
 
-interface SessionRow {
-  meta: ChatSessionMeta
-  preview: string
-  isActive: boolean
-  updatedAtLabel: string
-}
+import SessionsList from './sessions-list.vue'
 
-interface Props {
+defineProps<{
   open: boolean
   rows: SessionRow[]
   isDesktop: boolean
   isCreatingSession: boolean
-  mobilePaddingBottom: string
-}
-
-defineProps<Props>()
+}>()
 
 const emit = defineEmits<{
   'deleteSession': [sessionId: string]
@@ -33,108 +25,48 @@ const { t } = useI18n()
 </script>
 
 <template>
-  <DialogRoot :open="open" @update:open="value => emit('update:open', value)">
+  <BottomDrawer
+    v-if="!isDesktop"
+    :model-value="open"
+    :title="t('stage.chat.sessions.title')"
+    minimum-height="half"
+    @update:model-value="emit('update:open', $event)"
+  >
+    <template v-if="$slots.trigger" #trigger>
+      <slot name="trigger" />
+    </template>
+    <SessionsList
+      :rows="rows"
+      :is-creating-session="isCreatingSession"
+      @new-session="emit('newSession')"
+      @select-session="emit('selectSession', $event)"
+      @delete-session="emit('deleteSession', $event)"
+    />
+  </BottomDrawer>
+  <DialogRoot v-else :open="open" @update:open="emit('update:open', $event)">
     <slot name="trigger" />
     <DialogPortal>
       <DialogOverlay
-        :class="[
-          'fixed inset-0 z-[9999] bg-black/50 backdrop-blur-sm',
-          'data-[state=closed]:animate-fadeOut data-[state=open]:animate-fadeIn',
-        ]"
+        :class="['fixed inset-0 z-[9999] bg-black/35', 'data-[state=closed]:animate-fadeOut data-[state=open]:animate-fadeIn']"
       />
       <DialogContent
         :aria-describedby="undefined"
         :class="[
-          'fixed z-[9999] flex flex-col overflow-hidden bg-white/95 shadow-xl outline-none backdrop-blur-md dark:bg-neutral-900/95',
-          isDesktop
-            ? 'left-1/2 top-1/2 max-h-[80dvh] max-w-md w-[92dvw] rounded-2xl -translate-x-1/2 -translate-y-1/2 data-[state=closed]:animate-contentHide data-[state=open]:animate-contentShow'
-            : 'bottom-0 left-0 right-0 max-h-[85dvh] rounded-t-[32px]',
+          'pointer-events-auto fixed left-1/2 top-1/2 z-[9999] max-h-[80dvh] max-w-md w-[92dvw] flex flex-col rounded-3xl p-5',
+          '-translate-x-1/2 -translate-y-1/2 bg-neutral-50 text-neutral-900 shadow-xl outline-none dark:bg-neutral-900 dark:text-neutral-100',
+          'data-[state=closed]:animate-contentHide data-[state=open]:animate-contentShow',
         ]"
-        :style="isDesktop ? undefined : { paddingBottom: mobilePaddingBottom }"
       >
-        <div
-          v-if="!isDesktop"
-          :class="['mx-auto mt-3 h-1.5 w-12 shrink-0 rounded-full bg-neutral-400 dark:bg-neutral-600']"
-          aria-hidden="true"
+        <DialogTitle :class="['mb-5 text-xl font-semibold tracking-tight']">
+          {{ t('stage.chat.sessions.title') }}
+        </DialogTitle>
+        <SessionsList
+          :rows="rows"
+          :is-creating-session="isCreatingSession"
+          @new-session="emit('newSession')"
+          @select-session="emit('selectSession', $event)"
+          @delete-session="emit('deleteSession', $event)"
         />
-        <div :class="['flex min-h-0 flex-1 flex-col']">
-          <div :class="['flex items-center justify-between px-5 pt-5 pb-3']">
-            <DialogTitle :class="['text-base font-medium text-neutral-700 dark:text-neutral-200']">
-              {{ t('stage.chat.sessions.title') }}
-            </DialogTitle>
-            <button
-              type="button"
-              :class="[
-                'rounded-lg px-3 py-1.5 text-xs font-medium',
-                'bg-primary-100/60 text-primary-700 dark:bg-primary-900/40 dark:text-primary-200',
-                'hover:bg-primary-200/70 dark:hover:bg-primary-800/50',
-                'transition-colors',
-              ]"
-              :disabled="isCreatingSession"
-              @click="emit('newSession')"
-            >
-              {{ t('stage.chat.sessions.new') }}
-            </button>
-          </div>
-          <ScrollableArea
-            :class="['min-h-0 flex-1']"
-            :style="{
-              maxHeight: isDesktop
-                ? 'calc(80dvh - 4rem)'
-                : `calc(85dvh - ${mobilePaddingBottom} - 5rem)`,
-            }"
-            :viewport-class="['px-2 pb-4']"
-          >
-            <div v-if="rows.length === 0" :class="['p-6 text-center text-sm text-neutral-500 dark:text-neutral-400']">
-              {{ t('stage.chat.sessions.empty') }}
-            </div>
-            <div
-              v-for="row in rows"
-              :key="row.meta.sessionId"
-              :class="[
-                'group relative mb-1 w-full rounded-xl transition-colors',
-                row.isActive
-                  ? 'bg-primary-100/70 dark:bg-primary-900/40'
-                  : 'hover:bg-neutral-100/80 dark:hover:bg-neutral-800/60',
-              ]"
-            >
-              <button
-                type="button"
-                :class="['w-full flex flex-col gap-1 px-3 py-3 text-left outline-none']"
-                @click="emit('selectSession', row.meta.sessionId)"
-              >
-                <div :class="['flex items-center gap-2 text-sm font-medium text-neutral-700 dark:text-neutral-200']">
-                  <span :class="['flex-1 truncate']">{{ row.preview }}</span>
-                  <span
-                    v-if="row.meta.cloudChatId"
-                    :class="['shrink-0 rounded px-1.5 py-0.5 text-[10px] uppercase tracking-wide', 'bg-emerald-500/15 text-emerald-700 dark:text-emerald-300']"
-                    :title="t('stage.chat.sessions.cloud-badge')"
-                  >
-                    cloud
-                  </span>
-                  <span :class="['w-7']" />
-                </div>
-                <div :class="['text-[11px] text-neutral-500 dark:text-neutral-400']">
-                  {{ row.updatedAtLabel }}
-                </div>
-              </button>
-              <button
-                type="button"
-                :class="[
-                  'absolute right-2 top-2 z-10 h-7 w-7 flex items-center justify-center rounded-md',
-                  'opacity-100 md:opacity-0 md:group-hover:opacity-100 focus:opacity-100',
-                  'text-neutral-400 hover:bg-red-500/10 hover:text-red-500',
-                  'transition-opacity duration-150',
-                ]"
-                :aria-label="`${t('stage.chat.sessions.delete')}: ${row.preview}`"
-                :title="t('stage.chat.sessions.delete')"
-                @click.stop="emit('deleteSession', row.meta.sessionId)"
-              >
-                <div class="i-solar:trash-bin-trash-bold-duotone h-4 w-4" />
-              </button>
-            </div>
-          </ScrollableArea>
-        </div>
       </DialogContent>
     </DialogPortal>
   </DialogRoot>
diff --git a/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.browser.test.ts b/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.browser.test.ts
index 301b399e1..b432d985b 100644
--- a/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.browser.test.ts
+++ b/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.browser.test.ts
@@ -11,6 +11,9 @@ import SessionsDrawer from './sessions-drawer.vue'
 import { useChatStore } from '../../../../stores/chat'
 import { useChatSessionStore } from '../../../../stores/chat/session-store'
 
+import '@unocss/reset/tailwind.css'
+import 'virtual:uno.css'
+
 function createTestI18n() {
   return createI18n({
     legacy: false,
@@ -26,6 +29,9 @@ function createTestI18n() {
               'new': 'New chat',
               'empty': 'No chats',
               'delete': 'Delete',
+              'current': 'Current',
+              'cancel': 'Cancel',
+              'confirm-delete': 'Delete this conversation and its messages?',
               'cloud-badge': 'Cloud synced',
             },
           },
@@ -97,9 +103,10 @@ describe('sessions drawer orchestration', () => {
     await screen.rerender({ modelValue: true })
 
     await screen.getByRole('button', { name: 'Delete: Chat B' }).click()
+    await screen.getByRole('button', { name: 'Delete', exact: true }).click()
     await vi.waitFor(() => expect(chat.deleteSession).toHaveBeenCalledWith('session-b'))
 
-    await screen.getByRole('button', { name: /^Chat C / }).click()
+    await screen.getByRole('button', { name: /^Chat C/ }).click()
     expect(chatSession.activeSessionId).toBe('session-c')
 
     resolveDelete?.()
@@ -137,7 +144,7 @@ describe('sessions drawer orchestration', () => {
     await screen.getByRole('button', { name: 'New chat' }).click()
     await vi.waitFor(() => expect(chatSession.createSession).toHaveBeenCalledWith('default', { setActive: false }))
 
-    await screen.getByRole('button', { name: /^Chat C / }).click()
+    await screen.getByRole('button', { name: /^Chat C/ }).click()
     expect(chatSession.activeSessionId).toBe('session-c')
 
     resolveCreate?.('session-new')
diff --git a/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.vue b/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.vue
index e0f107d4a..30dba8e26 100644
--- a/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.vue
+++ b/packages/stage-ui/src/components/scenarios/chat/components/sessions-drawer.vue
@@ -1,9 +1,9 @@
 <script setup lang="ts">
 import type { ChatSessionMeta } from '../../../../types/chat-session'
+import type { SessionRow } from './sessions-list.vue'
 
-import { useResizeObserver, useScreenSafeArea } from '@vueuse/core'
 import { storeToRefs } from 'pinia'
-import { computed, onMounted, ref, watch } from 'vue'
+import { computed, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 
 import SessionsDialog from './sessions-dialog.vue'
@@ -20,8 +20,7 @@ import { useConsciousnessStore } from '../../../../stores/modules/consciousness'
 const showDialog = defineModel({ type: Boolean, default: false, required: false })
 
 const { isDesktop } = useBreakpoints()
-const screenSafeArea = useScreenSafeArea()
-const { t } = useI18n()
+const { t, locale } = useI18n()
 
 const chatSession = useChatSessionStore()
 const chat = useChatStore()
@@ -35,16 +34,6 @@ const { trackChatSessionSelected, trackChatSessionStarted } = useAnalytics()
 // second click from creating an orphan session while the first is pending.
 const isCreatingSession = ref(false)
 
-useResizeObserver(document.documentElement, () => screenSafeArea.update())
-onMounted(() => screenSafeArea.update())
-
-interface SessionRow {
-  meta: ChatSessionMeta
-  preview: string
-  isActive: boolean
-  updatedAtLabel: string
-}
-
 // Keep another account's sessions hidden while an account swap rehydrates.
 const ownedSessions = computed(() => {
   const effectiveUserId = userId.value || 'local'
@@ -91,7 +80,7 @@ const RELATIVE_UNITS: Array<[Intl.RelativeTimeFormatUnit, number]> = [
  * // => '5 minutes ago'
  */
 function formatUpdatedAt(ts: number): string {
-  const formatter = new Intl.RelativeTimeFormat(undefined, { numeric: 'auto' })
+  const formatter = new Intl.RelativeTimeFormat(locale.value, { numeric: 'auto' })
   const delta = ts - Date.now()
   const abs = Math.abs(delta)
   for (const [unit, ms] of RELATIVE_UNITS) {
@@ -115,11 +104,6 @@ const rows = computed<SessionRow[]>(() => {
   return list
 })
 
-const mobilePaddingBottom = computed(() => {
-  const safeAreaBottom = Number.parseFloat(screenSafeArea.bottom.value.replace('px', ''))
-  return `${Math.max(safeAreaBottom, 24)}px`
-})
-
 async function selectSession(sessionId: string) {
   const selectedRow = rows.value.find(row => row.meta.sessionId === sessionId)
   if (sessionId !== activeSessionId.value && selectedRow) {
@@ -188,7 +172,6 @@ watch(showDialog, async (open) => {
     :rows="rows"
     :is-desktop="isDesktop"
     :is-creating-session="isCreatingSession"
-    :mobile-padding-bottom="mobilePaddingBottom"
     @new-session="startNewSession"
     @select-session="selectSession"
     @delete-session="chat.deleteSession"
diff --git a/packages/stage-ui/src/components/scenarios/chat/components/sessions-list.vue b/packages/stage-ui/src/components/scenarios/chat/components/sessions-list.vue
new file mode 100644
index 000000000..b4f8eeeff
--- /dev/null
+++ b/packages/stage-ui/src/components/scenarios/chat/components/sessions-list.vue
@@ -0,0 +1,132 @@
+<script lang="ts">
+import type { ChatSessionMeta } from '../../../../types/chat-session'
+
+import { BasicButton, Button, GhostButton, ScrollableArea } from '@proj-airi/ui'
+import { shallowRef } from 'vue'
+import { useI18n } from 'vue-i18n'
+
+/** A conversation preview prepared by the session owner for either dialog surface. */
+export interface SessionRow {
+  meta: ChatSessionMeta
+  preview: string
+  isActive: boolean
+  updatedAtLabel: string
+}
+</script>
+
+<script setup lang="ts">
+defineProps<{
+  rows: SessionRow[]
+  isCreatingSession: boolean
+}>()
+
+const emit = defineEmits<{
+  deleteSession: [sessionId: string]
+  newSession: []
+  selectSession: [sessionId: string]
+}>()
+
+const { t } = useI18n()
+// The confirmation belongs to this open list, never to persisted session state.
+const pendingDeletion = shallowRef<string>()
+let deleteTrigger: HTMLElement | undefined
+
+function requestDeletion(sessionId: string, event: MouseEvent) {
+  deleteTrigger = event.currentTarget as HTMLElement
+  pendingDeletion.value = sessionId
+}
+
+function cancelDeletion() {
+  pendingDeletion.value = undefined
+  deleteTrigger?.focus()
+}
+</script>
+
+<template>
+  <div :class="['min-h-0 flex flex-col gap-4']">
+    <Button
+      block color="primary" variant="secondary" size="unset"
+      :class="['min-h-12 shrink-0 rounded-2xl px-4 py-3']"
+      :loading="isCreatingSession"
+      @click="emit('newSession')"
+    >
+      <span aria-hidden="true" :class="['i-solar:pen-new-square-outline size-5']" />
+      {{ t('stage.chat.sessions.new') }}
+    </Button>
+    <ScrollableArea :class="['min-h-0 max-h-[calc(80dvh-12rem)]']" :viewport-class="['p-1']">
+      <div v-if="rows.length === 0" :class="['min-h-40 flex flex-col items-center justify-center gap-3 text-sm text-neutral-500 dark:text-neutral-400']">
+        <span aria-hidden="true" :class="['i-solar:dialog-2-outline size-8 text-neutral-400']" />
+        {{ t('stage.chat.sessions.empty') }}
+      </div>
+      <ul v-else :class="['m-0 list-none space-y-2 p-0']">
+        <li
+          v-for="row in rows"
+          :key="row.meta.sessionId"
+          :class="[
+            'overflow-hidden rounded-2xl',
+            row.isActive ? 'bg-primary-50 dark:bg-primary-900/25' : 'bg-white dark:bg-neutral-800/60',
+          ]"
+        >
+          <div :class="['flex items-center pr-1']">
+            <BasicButton
+              size="unset"
+              :aria-current="row.isActive ? 'true' : undefined"
+              :class="[
+                'session-select min-h-20 min-w-0 flex-1 rounded-2xl px-3 py-3 text-left',
+                'focus-visible:outline-2 focus-visible:outline-primary-500',
+              ]"
+              @click="emit('selectSession', row.meta.sessionId)"
+            >
+              <span
+                aria-hidden="true"
+                :class="[
+                  'size-5 shrink-0',
+                  row.isActive ? 'i-solar:check-circle-bold text-primary-500' : 'i-solar:chat-line-outline text-neutral-400',
+                ]"
+              />
+              <span :class="['min-w-0 flex-1']">
+                <span :class="['block truncate text-sm font-medium']">{{ row.preview }}</span>
+                <span :class="['mt-1 flex items-center gap-2 text-xs font-normal text-neutral-500 dark:text-neutral-400']">
+                  <span>{{ row.updatedAtLabel }}</span>
+                  <span v-if="row.isActive" :class="['text-primary-600 dark:text-primary-300']">{{ t('stage.chat.sessions.current') }}</span>
+                  <span v-if="row.meta.cloudChatId" role="img" :aria-label="t('stage.chat.sessions.cloud-badge')" :title="t('stage.chat.sessions.cloud-badge')" :class="['i-solar:cloud-check-outline size-4 shrink-0']" />
+                </span>
+              </span>
+            </BasicButton>
+            <GhostButton
+              size="unset"
+              :class="['size-11 shrink-0 rounded-xl text-neutral-400 hover:bg-red-500/10 hover:text-red-500']"
+              :aria-label="`${t('stage.chat.sessions.delete')}: ${row.preview}`"
+              :title="t('stage.chat.sessions.delete')"
+              :aria-expanded="pendingDeletion === row.meta.sessionId"
+              @click="requestDeletion(row.meta.sessionId, $event)"
+            >
+              <span aria-hidden="true" :class="['i-solar:trash-bin-trash-outline size-5']" />
+            </GhostButton>
+          </div>
+          <div v-if="pendingDeletion === row.meta.sessionId" :class="['mx-3 border-t border-neutral-200 py-3 dark:border-neutral-700']">
+            <p role="status" :class="['mb-3 text-sm text-neutral-600 dark:text-neutral-300']">
+              {{ t('stage.chat.sessions.confirm-delete') }}
+            </p>
+            <div :class="['flex justify-end gap-2']">
+              <Button size="unset" :class="['min-h-11 px-4']" @click="cancelDeletion">
+                {{ t('stage.chat.sessions.cancel') }}
+              </Button>
+              <Button size="unset" color="red" variant="secondary" :class="['min-h-11 px-4']" @click="emit('deleteSession', row.meta.sessionId); pendingDeletion = undefined">
+                {{ t('stage.chat.sessions.delete') }}
+              </Button>
+            </div>
+          </div>
+        </li>
+      </ul>
+    </ScrollableArea>
+  </div>
+</template>
+
+<style scoped>
+.session-select :deep(.basic-button-content) {
+  width: 100%;
+  min-width: 0;
+  gap: 0.75rem;
+}
+</style>
diff --git a/packages/stage-ui/src/components/scenarios/dialogs/bottom-drawer.browser.test.ts b/packages/stage-ui/src/components/scenarios/dialogs/bottom-drawer.browser.test.ts
new file mode 100644
index 000000000..ca818e6f5
--- /dev/null
+++ b/packages/stage-ui/src/components/scenarios/dialogs/bottom-drawer.browser.test.ts
@@ -0,0 +1,45 @@
+import { BottomDrawer, GhostButton } from '@proj-airi/ui'
+import { describe, expect, it } from 'vitest'
+import { render } from 'vitest-browser-vue'
+import { userEvent } from 'vitest/browser'
+import { defineComponent, ref } from 'vue'
+
+const Harness = defineComponent({
+  components: { BottomDrawer, GhostButton },
+  setup() {
+    return { open: ref(false), count: ref(0), closed: ref(0) }
+  },
+  template: `
+    <BottomDrawer v-model="open" title="Stage" @after-close="closed++">
+      <template #trigger><GhostButton>More</GhostButton></template>
+      <GhostButton @click="count++">Change appearance</GhostButton>
+      <output aria-label="Action count">{{ count }}</output>
+    </BottomDrawer>
+    <output aria-label="Completed dismissals">{{ closed }}</output>
+  `,
+})
+
+describe('mobile tools drawer', () => {
+  // https://github.com/moeru-ai/airi/issues/2085
+  it('keeps action clicks independent of drag dismissal for Issue #2085', async () => {
+    // ROOT CAUSE:
+    // Dragging from action controls can dismiss a Vaul sheet before click runs.
+    // The shared drawer restricts drag initiation to its handle.
+    const screen = await render(Harness)
+    await screen.getByRole('button', { name: 'More' }).click()
+    await screen.getByRole('button', { name: 'Change appearance' }).click()
+    await screen.getByRole('button', { name: 'Change appearance' }).click()
+    await expect.element(screen.getByLabelText('Action count')).toHaveTextContent('2')
+    await expect.element(screen.getByRole('dialog', { name: 'Stage' })).toBeVisible()
+    await expect.element(screen.getByLabelText('Completed dismissals')).toHaveTextContent('0')
+  })
+
+  it('restores trigger focus and reports dismissal once', async () => {
+    const screen = await render(Harness)
+    await screen.getByRole('button', { name: 'More' }).click()
+    await expect.element(screen.getByRole('button', { name: 'Close' })).not.toBeInTheDocument()
+    await userEvent.keyboard('{Escape}')
+    await expect.element(screen.getByLabelText('Completed dismissals')).toHaveTextContent('1')
+    await expect.element(screen.getByRole('button', { name: 'More' })).toHaveFocus()
+  })
+})
diff --git a/packages/stage-ui/vitest.config.ts b/packages/stage-ui/vitest.config.ts
index 38c5d44d8..f2e7befd7 100644
--- a/packages/stage-ui/vitest.config.ts
+++ b/packages/stage-ui/vitest.config.ts
@@ -1,17 +1,33 @@
 import { cwd } from 'node:process'
 
 import Vue from '@vitejs/plugin-vue'
+import UnoCSS from 'unocss/vite'
 import Info from 'unplugin-info/vite'
 
 import { playwright } from '@vitest/browser-playwright'
 import { loadEnv } from 'vite'
 import { defineConfig } from 'vitest/config'
 
+import { sharedUnoConfig } from '../../uno.config'
+
 export default defineConfig({
   root: import.meta.dirname,
   plugins: [
     Info(),
     Vue(),
+    UnoCSS({
+      // Browser tests use product styles, not Histoire's hover-preview variants.
+      ...sharedUnoConfig(),
+      configFile: false,
+      // Vitest loads components after the stylesheet. Scan their source before
+      // the initial CSS response instead of relying on Vite's HMR updates.
+      content: {
+        filesystem: [
+          `${import.meta.dirname}/src/**/*.vue`,
+          `${import.meta.dirname}/../ui/src/**/*.vue`,
+        ],
+      },
+    }),
   ],
   test: {
     env: loadEnv('test', cwd(), ''),
diff --git a/packages/ui/package.json b/packages/ui/package.json
index f83664ca8..d5ebb7f8d 100644
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -30,6 +30,7 @@
     "@vueuse/core": "catalog:",
     "floating-vue": "catalog:",
     "reka-ui": "catalog:",
+    "vaul-vue": "catalog:",
     "vue": "catalog:"
   },
   "devDependencies": {
diff --git a/packages/ui/src/components/form/textarea/basic-text-area.vue b/packages/ui/src/components/form/textarea/basic-text-area.vue
index ef592fdb0..348bad2cf 100644
--- a/packages/ui/src/components/form/textarea/basic-text-area.vue
+++ b/packages/ui/src/components/form/textarea/basic-text-area.vue
@@ -44,7 +44,9 @@ function onPaste(e: ClipboardEvent) {
 // javascript - Creating a textarea with auto-resize - Stack Overflow
 // https://stackoverflow.com/questions/454202/creating-a-textarea-with-auto-resize
 watch(input, () => {
-  textareaHeight.value = 'auto'
+  // An explicit baseline prevents a flex parent's minimum height from
+  // stretching the textarea before scrollHeight measures its content.
+  textareaHeight.value = props.defaultHeight || 'auto'
   requestAnimationFrame(() => {
     if (!textareaRef.value)
       return
@@ -53,11 +55,7 @@ watch(input, () => {
       return
     }
 
-    // NOTICE: not sure why 4px is required but if not added, when
-    // input happened and placeholder now disappeared, the textarea will shrink
-    // a little bit and cause the input box to shake.
-    // TODO: find out the root cause and remove this magic number, or at least
-    // reference a more specific source.
+    // scrollHeight includes padding but excludes the two 2px borders.
     textareaHeight.value = `${textareaRef.value.scrollHeight + 4}px`
   })
 }, { immediate: true })
@@ -67,6 +65,7 @@ watch(input, () => {
   <textarea
     ref="textareaRef"
     v-model="input"
+    rows="1"
     :style="{ height: textareaHeight }"
     @keydown="onKeyDown"
     @paste="onPaste"
diff --git a/packages/ui/src/components/layouts/bottom-drawer.vue b/packages/ui/src/components/layouts/bottom-drawer.vue
new file mode 100644
index 000000000..2f38e342d
--- /dev/null
+++ b/packages/ui/src/components/layouts/bottom-drawer.vue
@@ -0,0 +1,72 @@
+<script setup lang="ts">
+import { DrawerContent, DrawerHandle, DrawerOverlay, DrawerPortal, DrawerRoot, DrawerTitle, DrawerTrigger } from 'vaul-vue'
+import { watch } from 'vue'
+
+const props = withDefaults(defineProps<{
+  /** Names the dialog for both the visible heading and assistive technology. */
+  title: string
+  /** Sets the minimum drawer height while content can still expand to the shared maximum. @default 'content' */
+  minimumHeight?: 'content' | 'half'
+}>(), {
+  minimumHeight: 'content',
+})
+
+const emit = defineEmits<{
+  /** Fires after dismissal completes, so a consumer can open another modal. */
+  afterClose: []
+  /** Cancel when focus will move directly into another modal. */
+  closeAutoFocus: [event: Event]
+}>()
+
+const open = defineModel<boolean>({ default: false })
+
+// Vaul can emit a closed animation event during initialization. Only a real
+// open-to-closed transition completes dismissal; reopening cancels that handoff.
+let closing = false
+watch(open, (value, previous) => {
+  closing = !value && previous
+}, { flush: 'sync' })
+
+function finishAnimation(value: boolean) {
+  if (value || open.value || !closing)
+    return
+  closing = false
+  emit('afterClose')
+}
+</script>
+
+<template>
+  <!-- Only the handle owns drag gestures; menu actions and scrolling keep native pointer behavior. -->
+  <DrawerRoot v-model:open="open" handle-only @animation-end="finishAnimation">
+    <DrawerTrigger v-if="$slots.trigger" as-child>
+      <slot name="trigger" />
+    </DrawerTrigger>
+    <DrawerPortal>
+      <DrawerOverlay :class="['fixed inset-0 z-[9999] bg-black/35']" />
+      <DrawerContent
+        :aria-describedby="undefined"
+        :class="[
+          'pointer-events-auto fixed inset-x-0 bottom-0 z-[9999] mx-auto max-w-lg',
+          'max-h-[90dvh] flex flex-col rounded-t-[32px] outline-none shadow-xl',
+          'bg-neutral-50 text-neutral-900 dark:bg-neutral-900 dark:text-neutral-100',
+          'pb-[max(1rem,env(safe-area-inset-bottom))]',
+          'motion-reduce:animate-none motion-reduce:transition-none',
+          props.minimumHeight === 'half' ? 'min-h-[50dvh]' : undefined,
+        ]"
+        @close-auto-focus="emit('closeAutoFocus', $event)"
+      >
+        <div :class="['shrink-0 px-5 pt-4']">
+          <DrawerHandle :class="['mb-3 bg-neutral-300 dark:bg-neutral-600']" />
+          <div :class="['mb-5 pt-2']">
+            <DrawerTitle :class="['text-xl font-semibold tracking-tight']">
+              {{ props.title }}
+            </DrawerTitle>
+          </div>
+        </div>
+        <div :class="['min-h-0 overflow-y-auto overscroll-contain px-5']">
+          <slot />
+        </div>
+      </DrawerContent>
+    </DrawerPortal>
+  </DrawerRoot>
+</template>
diff --git a/packages/ui/src/components/layouts/index.ts b/packages/ui/src/components/layouts/index.ts
index eaeb62d8e..d573c4e05 100644
--- a/packages/ui/src/components/layouts/index.ts
+++ b/packages/ui/src/components/layouts/index.ts
@@ -1,3 +1,4 @@
+export { default as BottomDrawer } from './bottom-drawer.vue'
 export { default as Collapsible } from './collapsible.vue'
 export { default as Screen } from './screen.vue'
 export { default as ScrollableArea } from './scrollable-area.vue'
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b21409a10..94e90d4c7 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -5232,6 +5232,9 @@ importers:
       reka-ui:
         specifier: 'catalog:'
         version: 2.10.3(vue@3.5.41(typescript@6.0.3))
+      vaul-vue:
+        specifier: 'catalog:'
+        version: 0.4.1(reka-ui@2.10.3(vue@3.5.41(typescript@6.0.3)))(vue@3.5.41(typescript@6.0.3))
       vue:
         specifier: 'catalog:'
         version: 3.5.41(typescript@6.0.3)