diff --git a/backend/crates/gateway-store/src/postgres/observability.rs b/backend/crates/gateway-store/src/postgres/observability.rs
index e7a78d6a0..8cfbc4438 100644
--- a/backend/crates/gateway-store/src/postgres/observability.rs
+++ b/backend/crates/gateway-store/src/postgres/observability.rs
@@ -23,7 +23,8 @@ const MAX_PAGE_SIZE: u16 = 100;
 const MAX_FILTER_BYTES: usize = 256;
 const MAX_SEARCH_BYTES: usize = 512;
 const MAX_ACCOUNT_IDS: usize = 200;
-const DASHBOARD_ACCOUNT_LIMIT: u16 = 50;
+/// 概览卡只展示最近使用的四个账号；完整账号用量由账号管理页单独查询。
+const DASHBOARD_ACCOUNT_LIMIT: u16 = 4;
 const DIAGNOSTIC_LIMIT: i64 = 100;
 const ACCOUNT_USAGE_TIMELINE_HOURS: i64 = 24;
 
diff --git a/frontend/src/components/base/BasePageHeader.vue b/frontend/src/components/base/BasePageHeader.vue
index 621494908..211384419 100644
--- a/frontend/src/components/base/BasePageHeader.vue
+++ b/frontend/src/components/base/BasePageHeader.vue
@@ -6,7 +6,7 @@ defineProps<{
 </script>
 
 <template>
-  <header class="flex min-h-17 shrink-0 items-start justify-between gap-4">
+  <header class="flex min-h-17 shrink-0 flex-wrap items-start justify-between gap-4">
     <div class="min-w-0">
       <h1 class="m-0 text-[34px] leading-[1.15] font-extrabold text-(--cp-text-primary)">
         {{ title }}
@@ -20,7 +20,10 @@ defineProps<{
         </slot>
       </p>
     </div>
-    <div v-if="$slots.actions" class="mt-0.5 flex shrink-0 items-center gap-2">
+    <div
+      v-if="$slots.actions"
+      class="mt-0.5 flex shrink-0 items-center gap-2 max-sm:w-full max-sm:justify-end"
+    >
       <slot name="actions" />
     </div>
   </header>
diff --git a/frontend/src/layout/components/FloatingSidebarToggle.vue b/frontend/src/layout/components/FloatingSidebarToggle.vue
new file mode 100644
index 000000000..0c5c55938
--- /dev/null
+++ b/frontend/src/layout/components/FloatingSidebarToggle.vue
@@ -0,0 +1,240 @@
+<script setup lang="ts">
+import type { CSSProperties } from 'vue'
+import { Menu } from '@lucide/vue'
+import {
+  useDraggable,
+  useElementSize,
+  useScreenSafeArea,
+  useStorage,
+  useWindowSize,
+} from '@vueuse/core'
+import {
+  computed,
+  nextTick,
+  onMounted,
+  onScopeDispose,
+  shallowRef,
+  useTemplateRef,
+  watch,
+} from 'vue'
+
+interface StoredPosition {
+  initialized: boolean
+  side: 'left' | 'right'
+  x: number
+  y: number
+}
+
+const emit = defineEmits<{
+  open: []
+}>()
+
+const edgeGap = 12
+const defaultButtonSize = 44
+const dragClickThreshold = 6
+const storageKey = 'codex-proxy:mobile-sidebar-toggle-position'
+
+const toggleEl = useTemplateRef<HTMLElement>('toggleEl')
+const { width: viewportWidth, height: viewportHeight } = useWindowSize({
+  initialWidth: 390,
+  initialHeight: 760,
+  type: 'visual',
+})
+const { width: toggleWidth, height: toggleHeight } = useElementSize(toggleEl, {
+  width: defaultButtonSize,
+  height: defaultButtonSize,
+})
+const safeArea = useScreenSafeArea()
+const storedPosition = useStorage<StoredPosition>(
+  storageKey,
+  {
+    initialized: false,
+    side: 'left',
+    x: edgeGap,
+    y: 136,
+  },
+  undefined,
+  { mergeDefaults: true, shallow: true },
+)
+const pointerStart = shallowRef({ x: edgeGap, y: 136 })
+const ignoreNextClick = shallowRef(false)
+const positionReady = shallowRef(false)
+let ignoreClickTimer: number | undefined
+
+const bounds = computed(() => {
+  const buttonWidth = positiveNumber(toggleWidth.value, defaultButtonSize)
+  const buttonHeight = positiveNumber(toggleHeight.value, defaultButtonSize)
+  const windowWidth = positiveNumber(viewportWidth.value, 390)
+  const windowHeight = positiveNumber(viewportHeight.value, 760)
+  const minX = parseCssPixel(safeArea.left.value) + edgeGap
+  const maxX = Math.max(
+    minX,
+    windowWidth - parseCssPixel(safeArea.right.value) - edgeGap - buttonWidth,
+  )
+  const minY = parseCssPixel(safeArea.top.value) + edgeGap
+  const maxY = Math.max(
+    minY,
+    windowHeight - parseCssPixel(safeArea.bottom.value) - edgeGap - buttonHeight,
+  )
+
+  return { minX, maxX, minY, maxY }
+})
+
+const { x, y, isDragging } = useDraggable(toggleEl, {
+  initialValue: {
+    x: storedPosition.value.x,
+    y: storedPosition.value.y,
+  },
+  preventDefault: false,
+  stopPropagation: false,
+  onEnd(position) {
+    applyPosition(snapPosition(position.x, position.y))
+  },
+})
+
+const toggleStyle = computed<CSSProperties>(() => ({
+  transform: `translate3d(${x.value}px, ${y.value}px, 0)`,
+  touchAction: 'none',
+}))
+
+function handlePointerDown(event: PointerEvent) {
+  pointerStart.value = { x: event.clientX, y: event.clientY }
+  const target = event.currentTarget
+  if (target instanceof HTMLElement)
+    target.setPointerCapture?.(event.pointerId)
+}
+
+function handlePointerUp(event: PointerEvent) {
+  const target = event.currentTarget
+  if (target instanceof HTMLElement)
+    target.releasePointerCapture?.(event.pointerId)
+
+  const moved = Math.hypot(
+    event.clientX - pointerStart.value.x,
+    event.clientY - pointerStart.value.y,
+  )
+  ignoreNextClick.value = true
+  window.clearTimeout(ignoreClickTimer)
+  ignoreClickTimer = window.setTimeout(() => {
+    ignoreNextClick.value = false
+  }, 320)
+
+  if (moved <= dragClickThreshold) {
+    emit('open')
+  }
+}
+
+function handleClick() {
+  if (isDragging.value || ignoreNextClick.value) {
+    ignoreNextClick.value = false
+    return
+  }
+
+  emit('open')
+}
+
+function defaultPosition() {
+  const targetY = Math.round(positiveNumber(viewportHeight.value, 760) * 0.36)
+  return snapPosition(bounds.value.minX, targetY)
+}
+
+function restorePosition() {
+  if (!storedPosition.value.initialized) {
+    applyPosition(defaultPosition())
+    return
+  }
+
+  const sideX = storedPosition.value.side === 'right' ? bounds.value.maxX : bounds.value.minX
+  applyPosition({
+    initialized: true,
+    side: storedPosition.value.side,
+    x: sideX,
+    y: storedPosition.value.y,
+  })
+}
+
+function snapPosition(rawX: number, rawY: number) {
+  const { minX, maxX, minY, maxY } = bounds.value
+  const side = rawX <= (minX + maxX) / 2 ? 'left' : 'right'
+
+  return {
+    initialized: true,
+    side,
+    x: side === 'left' ? minX : maxX,
+    y: clamp(rawY, minY, maxY),
+  } satisfies StoredPosition
+}
+
+function applyPosition(position: StoredPosition) {
+  const { minX, maxX, minY, maxY } = bounds.value
+  const next = {
+    initialized: true,
+    side: position.side,
+    x: clamp(position.x, minX, maxX),
+    y: clamp(position.y, minY, maxY),
+  } satisfies StoredPosition
+
+  x.value = next.x
+  y.value = next.y
+  storedPosition.value = next
+}
+
+function clamp(value: number, min: number, max: number) {
+  return Math.min(Math.max(value, min), max)
+}
+
+function positiveNumber(value: number, fallback: number) {
+  return Number.isFinite(value) && value > 0 ? value : fallback
+}
+
+function parseCssPixel(value: string) {
+  const parsed = Number.parseFloat(value)
+  return Number.isFinite(parsed) ? parsed : 0
+}
+
+onMounted(async () => {
+  await nextTick()
+  safeArea.update()
+  restorePosition()
+  positionReady.value = true
+})
+
+watch(
+  bounds,
+  () => {
+    if (!positionReady.value)
+      return
+    restorePosition()
+  },
+  { flush: 'post' },
+)
+
+onScopeDispose(() => {
+  window.clearTimeout(ignoreClickTimer)
+})
+</script>
+
+<template>
+  <div
+    ref="toggleEl"
+    class="fixed top-0 left-0 z-40 min-[961px]:hidden"
+    :class="positionReady ? 'opacity-100' : 'opacity-0'"
+    :style="toggleStyle"
+  >
+    <button
+      type="button"
+      class="inline-flex size-11.5 items-center justify-center rounded-(--cp-icon-button-radius) border-0 bg-(--cp-bg-surface) text-(--cp-text-primary) shadow-[0_18px_34px_-18px_var(--cp-shadow-sticky)] outline-none transition-[background-color,box-shadow,color,opacity,transform] duration-150 hover:bg-(--cp-default-bg-hover) hover:text-(--cp-normal) active:scale-95 focus-visible:ring-2 focus-visible:ring-(--cp-info-border) focus-visible:ring-offset-2 focus-visible:ring-offset-(--cp-bg-page)"
+      :class="
+        isDragging
+          ? 'scale-95 cursor-grabbing shadow-[0_14px_28px_-20px_var(--cp-shadow-sticky)]'
+          : 'cursor-grab'
+      "
+      aria-label="打开侧边栏"
+      @pointerdown="handlePointerDown"
+      @pointerup="handlePointerUp"
+      @click="handleClick"
+    >
+      <Menu class="size-5" />
+    </button>
+  </div>
+</template>
diff --git a/frontend/src/layout/components/MobileSidebarToolbar.vue b/frontend/src/layout/components/MobileSidebarToolbar.vue
deleted file mode 100644
index af8f5ca34..000000000
--- a/frontend/src/layout/components/MobileSidebarToolbar.vue
+++ /dev/null
@@ -1,26 +0,0 @@
-<script setup lang="ts">
-import { Menu } from '@lucide/vue'
-
-import BaseButton from '@/components/base/BaseButton.vue'
-
-const emit = defineEmits<{
-  open: []
-}>()
-</script>
-
-<template>
-  <div
-    class="sticky top-0 z-40 -mx-4 -mt-4 mb-4 flex h-15 items-center bg-(--cp-bg-page)/96 px-4 backdrop-blur-sm min-[961px]:hidden"
-  >
-    <BaseButton
-      icon-only
-      size="md"
-      variant="default"
-      label="打开侧边栏"
-      class="shadow-[0_12px_28px_-20px_var(--cp-shadow-sticky)]"
-      @click="emit('open')"
-    >
-      <Menu class="size-5" />
-    </BaseButton>
-  </div>
-</template>
diff --git a/frontend/src/layout/index.vue b/frontend/src/layout/index.vue
index 961c1508e..ca050e8b3 100644
--- a/frontend/src/layout/index.vue
+++ b/frontend/src/layout/index.vue
@@ -9,7 +9,7 @@ import { useUiStore } from '@/stores/modules/ui'
 
 import AppAboutModal from './components/AppAboutModal.vue'
 import AppSidebar from './components/AppSidebar.vue'
-import MobileSidebarToolbar from './components/MobileSidebarToolbar.vue'
+import FloatingSidebarToggle from './components/FloatingSidebarToggle.vue'
 import SystemUpdateModal from './components/SystemUpdateModal.vue'
 
 const uiStore = useUiStore()
@@ -77,12 +77,12 @@ watch(
       @open-about="aboutOpen = true"
       @open-system-update="openSystemUpdate"
     />
+    <FloatingSidebarToggle v-if="!mobileSidebarOpen" @open="openMobileSidebar" />
     <main class="h-dvh min-w-0 flex-1 overflow-hidden">
       <BaseScrollbar
         ref="pageScrollbarRef"
         view-class="flex min-h-full min-w-0 flex-col p-4 min-[961px]:p-6"
       >
-        <MobileSidebarToolbar v-if="!mobileSidebarOpen" @open="openMobileSidebar" />
         <RouterView v-slot="{ Component }">
           <component :is="Component" class="min-h-0 flex-1" />
         </RouterView>
diff --git a/frontend/src/views/accounts/components/AccountCreateModal.vue b/frontend/src/views/accounts/components/AccountCreateModal.vue
index e0af7fa6b..9395a1078 100644
--- a/frontend/src/views/accounts/components/AccountCreateModal.vue
+++ b/frontend/src/views/accounts/components/AccountCreateModal.vue
@@ -2,7 +2,7 @@
 import type { useAccountOnboarding } from '../composables/useAccountOnboarding'
 import type { AccountRow } from '../constants'
 import { Openai, Xai } from '@boxicons/vue'
-import { Copy, Grid2X2, KeyRound, Upload } from '@lucide/vue'
+import { Copy, KeyRound, LayoutGrid, Upload } from '@lucide/vue'
 
 import { useClipboard, useFileDialog } from '@vueuse/core'
 import { computed, ref } from 'vue'
@@ -207,7 +207,7 @@ async function copyText(value: string, successText: string) {
     :hide-footer="isChoosingProvider"
   >
     <template #icon>
-      <Grid2X2 v-if="isBatch" class="text-(--cp-text-primary)" aria-hidden="true" :width="20" :height="20" />
+      <LayoutGrid v-if="isBatch" class="text-(--cp-text-primary)" aria-hidden="true" :width="20" :height="20" />
       <Xai v-else-if="isXai" class="text-(--cp-text-primary)" aria-hidden="true" :width="20" :height="20" />
       <Openai v-else class="text-(--cp-text-primary)" aria-hidden="true" :width="20" :height="20" />
     </template>
diff --git a/frontend/src/views/accounts/components/AccountProviderChooser.vue b/frontend/src/views/accounts/components/AccountProviderChooser.vue
index 2390bb682..173ce8838 100644
--- a/frontend/src/views/accounts/components/AccountProviderChooser.vue
+++ b/frontend/src/views/accounts/components/AccountProviderChooser.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { Openai, Xai } from '@boxicons/vue'
-import { Grid2X2 } from '@lucide/vue'
+import { LayoutGrid } from '@lucide/vue'
 
 withDefaults(
   defineProps<{
@@ -16,6 +16,11 @@ const emit = defineEmits<{
 }>()
 
 const providers = [
+  {
+    value: 'batch' as const,
+    label: '批量导入',
+    icon: LayoutGrid,
+  },
   {
     value: 'openai' as const,
     label: 'OpenAI',
@@ -26,11 +31,6 @@ const providers = [
     label: 'xAI',
     icon: Xai,
   },
-  {
-    value: 'batch' as const,
-    label: '批量导入',
-    icon: Grid2X2,
-  },
 ]
 </script>
 
diff --git a/frontend/src/views/accounts/components/AccountUsageWindow.vue b/frontend/src/views/accounts/components/AccountUsageWindow.vue
index 0bd0a45bf..ea4129fd5 100644
--- a/frontend/src/views/accounts/components/AccountUsageWindow.vue
+++ b/frontend/src/views/accounts/components/AccountUsageWindow.vue
@@ -136,6 +136,7 @@ const requestBars = computed(() => {
     }
   })
 })
+const hasDailyRequests = computed(() => requestBars.value.some(bar => bar.requestCount > 0))
 </script>
 
 <template>
@@ -197,6 +198,7 @@ const requestBars = computed(() => {
         </strong>
       </div>
       <div
+        v-if="hasDailyRequests"
         class="flex items-stretch gap-px"
         :class="[trackShapeClass, !isCompact ? 'mt-2' : 'mt-auto']"
         role="img"
@@ -215,6 +217,11 @@ const requestBars = computed(() => {
           />
         </span>
       </div>
+      <span
+        v-else
+        class="block font-mono tabular-nums text-(--cp-text-muted)"
+        :class="[valueClass, !isCompact ? 'mt-2' : 'mt-auto']"
+      >—</span>
     </template>
 
     <div v-else :class="headerClass">