diff --git a/client/src/components/AppHeader.vue b/client/src/components/AppHeader.vue
index e178fa501..bf12d7fbe 100644
--- a/client/src/components/AppHeader.vue
+++ b/client/src/components/AppHeader.vue
@@ -607,7 +607,13 @@ function formatBadgeStyle(fmt: string) {
         <!-- Mobile: search icon -->
         <Tooltip>
           <TooltipTrigger as-child>
-            <Button variant="ghost" size="icon" :class="['md:hidden', controlClass]" @click="mobileSearchOpen = true">
+            <Button
+              variant="ghost"
+              size="icon"
+              :class="['md:hidden', controlClass]"
+              :aria-label="t('common.search')"
+              @click="mobileSearchOpen = true"
+            >
               <Search :size="15" />
             </Button>
           </TooltipTrigger>
@@ -692,6 +698,7 @@ function formatBadgeStyle(fmt: string) {
                 variant="ghost"
                 size="icon"
                 :class="destinationClass(isStatisticsActive)"
+                :aria-label="t('components.appHeader.statistics')"
                 @click="navigateToStatistics"
               >
                 <BarChart3 :size="15" />
@@ -702,7 +709,13 @@ function formatBadgeStyle(fmt: string) {
 
           <Tooltip v-if="achievementsEnabled">
             <TooltipTrigger as-child>
-              <Button variant="ghost" size="icon" :class="destinationClass(isAchievementsActive)" @click="navigateToAchievements">
+              <Button
+                variant="ghost"
+                size="icon"
+                :class="destinationClass(isAchievementsActive)"
+                :aria-label="t('components.appHeader.achievements')"
+                @click="navigateToAchievements"
+              >
                 <Trophy :size="15" />
               </Button>
             </TooltipTrigger>
@@ -711,7 +724,14 @@ function formatBadgeStyle(fmt: string) {
 
           <Tooltip v-if="hasPermission('library_upload')">
             <TooltipTrigger as-child>
-              <Button data-tour="upload-button" variant="ghost" size="icon" :class="controlClass" @click="uploadOpen = true">
+              <Button
+                data-tour="upload-button"
+                variant="ghost"
+                size="icon"
+                :class="controlClass"
+                :aria-label="t('components.appHeader.uploadBooks')"
+                @click="uploadOpen = true"
+              >
                 <Upload :size="15" />
               </Button>
             </TooltipTrigger>
@@ -726,7 +746,13 @@ function formatBadgeStyle(fmt: string) {
             <DropdownMenu>
               <TooltipTrigger as-child>
                 <DropdownMenuTrigger as-child>
-                  <Button data-tour="documentation-link" variant="ghost" size="icon" :class="['relative', controlClass]">
+                  <Button
+                    data-tour="documentation-link"
+                    variant="ghost"
+                    size="icon"
+                    :class="['relative', controlClass]"
+                    :aria-label="t('components.appHeader.help')"
+                  >
                     <BadgeQuestionMark :size="15" />
                     <span
                       v-if="hasUnseenWhatsNew"
@@ -762,7 +788,13 @@ function formatBadgeStyle(fmt: string) {
             <Popover>
               <TooltipTrigger as-child>
                 <PopoverTrigger as-child>
-                  <Button data-tour="appearance-picker" variant="ghost" size="icon" :class="controlClass">
+                  <Button
+                    data-tour="appearance-picker"
+                    variant="ghost"
+                    size="icon"
+                    :class="controlClass"
+                    :aria-label="t('components.appHeader.appearance')"
+                  >
                     <Palette :size="15" />
                   </Button>
                 </PopoverTrigger>
@@ -824,7 +856,14 @@ function formatBadgeStyle(fmt: string) {
 
           <Tooltip>
             <TooltipTrigger as-child>
-              <Button data-tour="settings-nav" variant="ghost" size="icon" :class="controlClass" @click="navigateToSettings">
+              <Button
+                data-tour="settings-nav"
+                variant="ghost"
+                size="icon"
+                :class="controlClass"
+                :aria-label="t('components.appHeader.settings')"
+                @click="navigateToSettings"
+              >
                 <Settings :size="15" />
               </Button>
             </TooltipTrigger>
diff --git a/client/src/components/ViewHeader.vue b/client/src/components/ViewHeader.vue
index bf13daffb..ba28ccaa4 100644
--- a/client/src/components/ViewHeader.vue
+++ b/client/src/components/ViewHeader.vue
@@ -6,6 +6,7 @@ import { CheckSquare, LayoutGrid, List, SlidersHorizontal, Square, Table2 } from
 import { Button } from '@/components/ui/button'
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover'
 import { Sheet, SheetContent, SheetDescription, SheetHeader, SheetTitle } from '@/components/ui/sheet'
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import type { TableDensity } from '@bookorbit/types'
 import type { BookViewMode } from '@/composables/useDisplaySettings'
 import ViewHeaderDesktopSearch from '@/components/view-header/ViewHeaderDesktopSearch.vue'
@@ -85,6 +86,62 @@ const mobileSearchOpen = ref(false)
 function handleShowJumpRailsUpdate(value: boolean) {
   emit('update:showJumpRails', value)
 }
+
+function handleCoverSizeUpdate(value: number) {
+  emit('update:coverSize', value)
+}
+
+function handleGridGapUpdate(value: number) {
+  emit('update:gridGap', value)
+}
+
+function handleRowDensityUpdate(value: TableDensity) {
+  emit('update:rowDensity', value)
+}
+
+function handleCoverFallbackUpdate(value: boolean) {
+  emit('update:coverFallback', value)
+}
+
+function handleCoverShapeUpdate(value: 'square' | 'circle') {
+  emit('update:coverShape', value)
+}
+
+function handleViewModeUpdate(value: BookViewMode) {
+  emit('update:viewMode', value)
+}
+
+function handleSearchQueryUpdate(value: string) {
+  emit('update:searchQuery', value)
+}
+
+function handleToggleSelection() {
+  emit('toggle-selection')
+}
+
+function handleGridView() {
+  handleViewModeUpdate('grid')
+}
+
+function handleListView() {
+  handleViewModeUpdate('list')
+}
+
+function handleTableView() {
+  handleViewModeUpdate('table')
+}
+
+function handleOpenDisplay() {
+  mobileDisplayOpen.value = true
+}
+
+function handleOpenMobileSearch() {
+  mobileSearchOpen.value = true
+}
+
+function handleMobileSearchOpenUpdate(value: boolean) {
+  mobileSearchOpen.value = value
+}
 </script>
 
 <template>
@@ -100,7 +157,7 @@ function handleShowJumpRailsUpdate(value: boolean) {
         v-if="searchable"
         :search-query="searchQuery"
         :placeholder="searchPlaceholder"
-        @update:search-query="emit('update:searchQuery', $event)"
+        @update:search-query="handleSearchQueryUpdate"
       />
 
       <slot name="toolbar" />
@@ -116,7 +173,7 @@ function handleShowJumpRailsUpdate(value: boolean) {
             ? 'text-primary bg-primary/10 hover:bg-primary/20 ring-1 ring-primary/20'
             : 'text-muted-foreground hover:text-foreground hover:bg-primary/5'
         "
-        @click="emit('toggle-selection')"
+        @click="handleToggleSelection"
       >
         <CheckSquare v-if="selectionMode" :size="13" />
         <Square v-else :size="13" />
@@ -126,88 +183,105 @@ function handleShowJumpRailsUpdate(value: boolean) {
       <div v-if="showSelection" class="mx-1.5 hidden h-3.5 w-px bg-border/40 md:block" />
 
       <div v-if="showViewModeToggle && allowedViewModes.length > 0" class="hidden items-center gap-0.5 md:flex">
-        <Button
-          v-if="allowedViewModes.includes('grid')"
-          variant="ghost"
-          size="icon"
-          class="h-8 w-8 rounded-lg"
-          :class="viewMode === 'grid' ? 'text-primary bg-primary/10' : 'text-muted-foreground hover:text-foreground hover:bg-primary/5'"
-          :aria-label="t('components.viewHeader.viewModes.grid')"
-          :aria-pressed="viewMode === 'grid'"
-          @click="emit('update:viewMode', 'grid')"
-        >
-          <LayoutGrid :size="14" />
-        </Button>
-        <Button
-          v-if="allowedViewModes.includes('list')"
-          variant="ghost"
-          size="icon"
-          class="h-8 w-8 rounded-lg"
-          :class="viewMode === 'list' ? 'text-primary bg-primary/10' : 'text-muted-foreground hover:text-foreground hover:bg-primary/5'"
-          :aria-label="t('components.viewHeader.viewModes.list')"
-          :aria-pressed="viewMode === 'list'"
-          @click="emit('update:viewMode', 'list')"
-        >
-          <List :size="14" />
-        </Button>
-        <Button
-          v-if="allowedViewModes.includes('table')"
-          variant="ghost"
-          size="icon"
-          class="h-8 w-8 rounded-lg"
-          :class="viewMode === 'table' ? 'text-primary bg-primary/10' : 'text-muted-foreground hover:text-foreground hover:bg-primary/5'"
-          :aria-label="t('components.viewHeader.viewModes.table')"
-          :aria-pressed="viewMode === 'table'"
-          @click="emit('update:viewMode', 'table')"
-        >
-          <Table2 :size="14" />
-        </Button>
+        <Tooltip v-if="allowedViewModes.includes('grid')">
+          <TooltipTrigger as-child>
+            <Button
+              variant="ghost"
+              size="icon"
+              class="h-8 w-8 rounded-lg"
+              :class="viewMode === 'grid' ? 'text-primary bg-primary/10' : 'text-muted-foreground hover:text-foreground hover:bg-primary/5'"
+              :aria-label="t('components.viewHeader.viewModes.grid')"
+              :aria-pressed="viewMode === 'grid'"
+              @click="handleGridView"
+            >
+              <LayoutGrid :size="14" aria-hidden="true" />
+            </Button>
+          </TooltipTrigger>
+          <TooltipContent>{{ t('components.viewHeader.viewModes.grid') }}</TooltipContent>
+        </Tooltip>
+        <Tooltip v-if="allowedViewModes.includes('list')">
+          <TooltipTrigger as-child>
+            <Button
+              variant="ghost"
+              size="icon"
+              class="h-8 w-8 rounded-lg"
+              :class="viewMode === 'list' ? 'text-primary bg-primary/10' : 'text-muted-foreground hover:text-foreground hover:bg-primary/5'"
+              :aria-label="t('components.viewHeader.viewModes.list')"
+              :aria-pressed="viewMode === 'list'"
+              @click="handleListView"
+            >
+              <List :size="14" aria-hidden="true" />
+            </Button>
+          </TooltipTrigger>
+          <TooltipContent>{{ t('components.viewHeader.viewModes.list') }}</TooltipContent>
+        </Tooltip>
+        <Tooltip v-if="allowedViewModes.includes('table')">
+          <TooltipTrigger as-child>
+            <Button
+              variant="ghost"
+              size="icon"
+              class="h-8 w-8 rounded-lg"
+              :class="viewMode === 'table' ? 'text-primary bg-primary/10' : 'text-muted-foreground hover:text-foreground hover:bg-primary/5'"
+              :aria-label="t('components.viewHeader.viewModes.table')"
+              :aria-pressed="viewMode === 'table'"
+              @click="handleTableView"
+            >
+              <Table2 :size="14" aria-hidden="true" />
+            </Button>
+          </TooltipTrigger>
+          <TooltipContent>{{ t('components.viewHeader.viewModes.table') }}</TooltipContent>
+        </Tooltip>
       </div>
 
-      <Popover v-if="showDisplayControls">
-        <PopoverTrigger as-child>
-          <Button
-            variant="ghost"
-            size="icon"
-            class="hidden h-8 w-8 rounded-lg text-muted-foreground hover:bg-primary/5 hover:text-foreground md:flex"
-            :aria-label="t('components.viewHeader.display')"
-          >
-            <SlidersHorizontal :size="14" />
-          </Button>
-        </PopoverTrigger>
-        <PopoverContent :class="viewMode === 'table' ? 'w-80 max-w-[90vw] max-h-[80vh] overflow-y-auto p-4' : 'w-56 p-4'" align="end">
-          <ViewHeaderDisplayControls
-            :view-mode="viewMode"
-            :cover-size="coverSize"
-            :grid-gap="gridGap"
-            :show-jump-rail-toggle="showJumpRailToggle"
-            :show-jump-rails="showJumpRails"
-            :jump-rail-modes="jumpRailModes"
-            :row-density="rowDensity"
-            :show-cover-fallback-toggle="showCoverFallbackToggle"
-            :cover-fallback="coverFallback"
-            :cover-shape="coverShape"
-            :cover-size-min="coverSizeMin"
-            :cover-size-max="coverSizeMax"
-            :cover-size-step="coverSizeStep"
-            :grid-gap-min="gridGapMin"
-            :grid-gap-max="gridGapMax"
-            :grid-gap-step="gridGapStep"
-            @update:cover-size="emit('update:coverSize', $event)"
-            @update:grid-gap="emit('update:gridGap', $event)"
-            @update:show-jump-rails="handleShowJumpRailsUpdate"
-            @update:row-density="emit('update:rowDensity', $event)"
-            @update:cover-fallback="emit('update:coverFallback', $event)"
-            @update:cover-shape="emit('update:coverShape', $event)"
-          >
-            <template #columns>
-              <slot name="columns">
-                <p class="text-xs text-muted-foreground">{{ t('components.viewHeader.columnVisibilityHint') }}</p>
-              </slot>
-            </template>
-          </ViewHeaderDisplayControls>
-        </PopoverContent>
-      </Popover>
+      <Tooltip v-if="showDisplayControls">
+        <Popover>
+          <TooltipTrigger as-child>
+            <PopoverTrigger as-child>
+              <Button
+                variant="ghost"
+                size="icon"
+                class="hidden h-8 w-8 rounded-lg text-muted-foreground hover:bg-primary/5 hover:text-foreground md:flex"
+                :aria-label="t('components.viewHeader.display')"
+              >
+                <SlidersHorizontal :size="14" aria-hidden="true" />
+              </Button>
+            </PopoverTrigger>
+          </TooltipTrigger>
+          <PopoverContent :class="viewMode === 'table' ? 'w-80 max-w-[90vw] max-h-[80vh] overflow-y-auto p-4' : 'w-56 p-4'" align="end">
+            <ViewHeaderDisplayControls
+              :view-mode="viewMode"
+              :cover-size="coverSize"
+              :grid-gap="gridGap"
+              :show-jump-rail-toggle="showJumpRailToggle"
+              :show-jump-rails="showJumpRails"
+              :jump-rail-modes="jumpRailModes"
+              :row-density="rowDensity"
+              :show-cover-fallback-toggle="showCoverFallbackToggle"
+              :cover-fallback="coverFallback"
+              :cover-shape="coverShape"
+              :cover-size-min="coverSizeMin"
+              :cover-size-max="coverSizeMax"
+              :cover-size-step="coverSizeStep"
+              :grid-gap-min="gridGapMin"
+              :grid-gap-max="gridGapMax"
+              :grid-gap-step="gridGapStep"
+              @update:cover-size="handleCoverSizeUpdate"
+              @update:grid-gap="handleGridGapUpdate"
+              @update:show-jump-rails="handleShowJumpRailsUpdate"
+              @update:row-density="handleRowDensityUpdate"
+              @update:cover-fallback="handleCoverFallbackUpdate"
+              @update:cover-shape="handleCoverShapeUpdate"
+            >
+              <template #columns>
+                <slot name="columns">
+                  <p class="text-xs text-muted-foreground">{{ t('components.viewHeader.columnVisibilityHint') }}</p>
+                </slot>
+              </template>
+            </ViewHeaderDisplayControls>
+          </PopoverContent>
+        </Popover>
+        <TooltipContent>{{ t('components.viewHeader.display') }}</TooltipContent>
+      </Tooltip>
 
       <ViewHeaderMobileMenu
         :view-mode="viewMode"
@@ -218,10 +292,10 @@ function handleShowJumpRailsUpdate(value: boolean) {
         :mobile-search-in-menu="mobileSearchInMenu"
         :show-display-action="mobileDisplayInMenu && showDisplayControls"
         :allowed-view-modes="allowedViewModes"
-        @update:view-mode="emit('update:viewMode', $event)"
-        @open-display="mobileDisplayOpen = true"
-        @open-mobile-search="mobileSearchOpen = true"
-        @toggle-selection="emit('toggle-selection')"
+        @update:view-mode="handleViewModeUpdate"
+        @open-display="handleOpenDisplay"
+        @open-mobile-search="handleOpenMobileSearch"
+        @toggle-selection="handleToggleSelection"
       >
         <template v-if="$slots['mobile-menu']" #mobile-menu>
           <slot name="mobile-menu" />
@@ -254,12 +328,12 @@ function handleShowJumpRailsUpdate(value: boolean) {
           :grid-gap-min="gridGapMin"
           :grid-gap-max="gridGapMax"
           :grid-gap-step="gridGapStep"
-          @update:cover-size="emit('update:coverSize', $event)"
-          @update:grid-gap="emit('update:gridGap', $event)"
+          @update:cover-size="handleCoverSizeUpdate"
+          @update:grid-gap="handleGridGapUpdate"
           @update:show-jump-rails="handleShowJumpRailsUpdate"
-          @update:row-density="emit('update:rowDensity', $event)"
-          @update:cover-fallback="emit('update:coverFallback', $event)"
-          @update:cover-shape="emit('update:coverShape', $event)"
+          @update:row-density="handleRowDensityUpdate"
+          @update:cover-fallback="handleCoverFallbackUpdate"
+          @update:cover-shape="handleCoverShapeUpdate"
         >
           <template #columns>
             <slot name="columns">
@@ -276,7 +350,7 @@ function handleShowJumpRailsUpdate(value: boolean) {
     :open="mobileSearchOpen"
     :search-query="searchQuery"
     :placeholder="searchPlaceholder"
-    @update:open="mobileSearchOpen = $event"
-    @update:search-query="emit('update:searchQuery', $event)"
+    @update:open="handleMobileSearchOpenUpdate"
+    @update:search-query="handleSearchQueryUpdate"
   />
 </template>
diff --git a/client/src/components/__tests__/AppHeader.spec.ts b/client/src/components/__tests__/AppHeader.spec.ts
index 29299b11a..c2b8eddb0 100644
--- a/client/src/components/__tests__/AppHeader.spec.ts
+++ b/client/src/components/__tests__/AppHeader.spec.ts
@@ -328,6 +328,15 @@ describe('AppHeader global search', () => {
     expect(settingsControlIndex).toBe(languageControlIndex + 1)
   })
 
+  it('labels the icon-only desktop destinations and preference controls', () => {
+    const wrapper = mountHeader()
+
+    expect(wrapper.get('[data-tour="statistics-btn"]').attributes('aria-label')).toBe('Statistics')
+    expect(wrapper.get('[data-tour="documentation-link"]').attributes('aria-label')).toBe('Help')
+    expect(wrapper.get('[data-tour="appearance-picker"]').attributes('aria-label')).toBe('Appearance')
+    expect(wrapper.get('[data-tour="settings-nav"]').attributes('aria-label')).toBe('Settings')
+  })
+
   it('opens settings from the mobile overflow menu', async () => {
     const wrapper = mountHeader()
     const settingsItem = wrapper.findAllComponents({ name: 'DropdownMenuItem' }).find((item) => item.text().trim() === 'Settings')
diff --git a/client/src/components/__tests__/ViewHeader.spec.ts b/client/src/components/__tests__/ViewHeader.spec.ts
new file mode 100644
index 000000000..136812716
--- /dev/null
+++ b/client/src/components/__tests__/ViewHeader.spec.ts
@@ -0,0 +1,54 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import ViewHeader from '../ViewHeader.vue'
+
+const stubs = {
+  AppIcon: { template: '<span />' },
+  Button: { template: '<button type="button"><slot /></button>' },
+  Popover: { template: '<div><slot /></div>' },
+  PopoverTrigger: { template: '<div><slot /></div>' },
+  PopoverContent: { template: '<div><slot /></div>' },
+  Sheet: { template: '<div><slot /></div>' },
+  SheetContent: { template: '<div><slot /></div>' },
+  SheetDescription: { template: '<div><slot /></div>' },
+  SheetHeader: { template: '<div><slot /></div>' },
+  SheetTitle: { template: '<div><slot /></div>' },
+  Tooltip: { template: '<div><slot /></div>' },
+  TooltipTrigger: { template: '<div><slot /></div>' },
+  TooltipContent: { template: '<div data-testid="tooltip-content"><slot /></div>' },
+  ViewHeaderDisplayControls: { template: '<div />' },
+  ViewHeaderMobileMenu: { template: '<div />' },
+  ViewHeaderMobileSearchSheet: { template: '<div />' },
+}
+
+function mountHeader() {
+  return mount(ViewHeader, {
+    props: {
+      title: 'Library',
+      total: 12,
+      coverSize: 120,
+      gridGap: 16,
+      viewMode: 'grid',
+    },
+    global: { stubs },
+  })
+}
+
+describe('ViewHeader icon controls', () => {
+  it('provides matching labels and tooltips for view modes and display settings', () => {
+    const wrapper = mountHeader()
+
+    for (const label of ['Grid view', 'List view', 'Table view', 'Display']) {
+      expect(wrapper.get(`button[aria-label="${label}"]`)).toBeTruthy()
+      expect(wrapper.findAll('[data-testid="tooltip-content"]').some((content) => content.text() === label)).toBe(true)
+    }
+  })
+
+  it('keeps view-mode buttons interactive through the tooltip trigger', async () => {
+    const wrapper = mountHeader()
+
+    await wrapper.get('button[aria-label="List view"]').trigger('click')
+
+    expect(wrapper.emitted('update:viewMode')).toEqual([['list']])
+  })
+})
diff --git a/client/src/components/ui/sidebar/SidebarTrigger.vue b/client/src/components/ui/sidebar/SidebarTrigger.vue
index 4b8b1591f..0fdf7ef3f 100644
--- a/client/src/components/ui/sidebar/SidebarTrigger.vue
+++ b/client/src/components/ui/sidebar/SidebarTrigger.vue
@@ -1,22 +1,42 @@
 <script setup lang="ts">
-import type { HTMLAttributes } from 'vue'
+import { computed, type HTMLAttributes } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { PanelLeft } from '@lucide/vue'
 import { cn } from '@/lib/utils'
 import { Button } from '@/components/ui/button'
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import { useSidebar } from './utils'
 
 const props = defineProps<{
   class?: HTMLAttributes['class']
 }>()
 
-const { toggleSidebar } = useSidebar()
+const { isMobile, openMobile, state, toggleSidebar } = useSidebar()
 const { t } = useI18n()
+
+const actionLabel = computed(() => {
+  if (isMobile.value) {
+    return openMobile.value ? t('components.ui.sidebar.close') : t('components.ui.sidebar.open')
+  }
+  return state.value === 'expanded' ? t('components.ui.sidebar.collapse') : t('components.ui.sidebar.expand')
+})
 </script>
 
 <template>
-  <Button data-sidebar="trigger" data-slot="sidebar-trigger" variant="ghost" size="icon" :class="cn('h-7 w-7', props.class)" @click="toggleSidebar">
-    <PanelLeft />
-    <span class="sr-only">{{ t('components.ui.sidebar.toggle') }}</span>
-  </Button>
+  <Tooltip>
+    <TooltipTrigger as-child>
+      <Button
+        data-sidebar="trigger"
+        data-slot="sidebar-trigger"
+        variant="ghost"
+        size="icon"
+        :class="cn('h-7 w-7', props.class)"
+        :aria-label="actionLabel"
+        @click="toggleSidebar"
+      >
+        <PanelLeft aria-hidden="true" />
+      </Button>
+    </TooltipTrigger>
+    <TooltipContent>{{ actionLabel }}</TooltipContent>
+  </Tooltip>
 </template>
diff --git a/client/src/components/ui/sidebar/__tests__/SidebarProvider.spec.ts b/client/src/components/ui/sidebar/__tests__/SidebarProvider.spec.ts
index 54fc28e97..9155f3c64 100644
--- a/client/src/components/ui/sidebar/__tests__/SidebarProvider.spec.ts
+++ b/client/src/components/ui/sidebar/__tests__/SidebarProvider.spec.ts
@@ -2,6 +2,7 @@ import { defineComponent } from 'vue'
 import { mount } from '@vue/test-utils'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import SidebarProvider from '../SidebarProvider.vue'
+import SidebarTrigger from '../SidebarTrigger.vue'
 import { useSidebar } from '../utils'
 
 const { readDeviceValue, writeDeviceValue } = vi.hoisted(() => ({
@@ -54,4 +55,29 @@ describe('SidebarProvider', () => {
     expect(trigger.attributes('data-state')).toBe('expanded')
     expect(writeDeviceValue).toHaveBeenLastCalledWith('collapsed', false)
   })
+
+  it('describes the action the sidebar trigger will perform', async () => {
+    const wrapper = mount(SidebarProvider, {
+      slots: {
+        default: SidebarTrigger,
+      },
+      global: {
+        stubs: {
+          TooltipProvider: { template: '<div><slot /></div>' },
+          Tooltip: { template: '<div><slot /></div>' },
+          TooltipTrigger: { template: '<div><slot /></div>' },
+          TooltipContent: { template: '<div data-testid="tooltip-content"><slot /></div>' },
+        },
+      },
+    })
+    const trigger = wrapper.get('button')
+
+    expect(trigger.attributes('aria-label')).toBe('Collapse sidebar')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Collapse sidebar')
+
+    await trigger.trigger('click')
+
+    expect(trigger.attributes('aria-label')).toBe('Expand sidebar')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Expand sidebar')
+  })
 })
diff --git a/client/src/components/view-header/ViewHeaderDesktopSearch.spec.ts b/client/src/components/view-header/ViewHeaderDesktopSearch.spec.ts
new file mode 100644
index 000000000..01fa98436
--- /dev/null
+++ b/client/src/components/view-header/ViewHeaderDesktopSearch.spec.ts
@@ -0,0 +1,27 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import ViewHeaderDesktopSearch from './ViewHeaderDesktopSearch.vue'
+
+const stubs = {
+  Tooltip: { template: '<div><slot /></div>' },
+  TooltipTrigger: { template: '<div><slot /></div>' },
+  TooltipContent: { template: '<div data-testid="tooltip-content"><slot /></div>' },
+}
+
+describe('ViewHeaderDesktopSearch', () => {
+  it('labels and describes the collapsed search control', () => {
+    const wrapper = mount(ViewHeaderDesktopSearch, { global: { stubs } })
+
+    expect(wrapper.get('input').attributes('aria-label')).toBe('Search')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Search')
+  })
+
+  it('labels the close action after search expands', async () => {
+    const wrapper = mount(ViewHeaderDesktopSearch, { global: { stubs } })
+
+    await wrapper.get('input').trigger('focus')
+
+    expect(wrapper.get('button').attributes('aria-label')).toBe('Close')
+    expect(wrapper.findAll('[data-testid="tooltip-content"]').map((content) => content.text())).toEqual(['Search', 'Close'])
+  })
+})
diff --git a/client/src/components/view-header/ViewHeaderDesktopSearch.vue b/client/src/components/view-header/ViewHeaderDesktopSearch.vue
index 3959cbc16..b9dd0fb5d 100644
--- a/client/src/components/view-header/ViewHeaderDesktopSearch.vue
+++ b/client/src/components/view-header/ViewHeaderDesktopSearch.vue
@@ -2,6 +2,7 @@
 import { nextTick, ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { Search, X } from '@lucide/vue'
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 
 const props = withDefaults(
   defineProps<{
@@ -56,23 +57,39 @@ function handleSearchKeydown(event: KeyboardEvent) {
       class="pointer-events-none absolute left-2 z-10 transition-colors duration-200"
       :class="searchActive ? 'text-primary' : 'text-muted-foreground'"
     />
-    <input
-      ref="searchInputRef"
-      :value="searchQuery ?? ''"
-      @focus="openSearch"
-      @input="handleSearchInput"
-      @keydown="handleSearchKeydown"
-      type="text"
-      :placeholder="props.placeholder ?? t('components.viewHeader.searchPlaceholder')"
-      class="h-8 text-[13px] transition-all duration-300 focus:outline-none"
-      :class="
-        searchActive
-          ? 'w-44 cursor-text rounded-lg border border-primary/30 bg-primary/5 pl-8 pr-6 text-foreground placeholder:text-muted-foreground focus:ring-1 focus:ring-primary/30 lg:w-72'
-          : 'w-8 cursor-pointer rounded-lg border border-input bg-transparent pl-2.25 pr-0 text-transparent placeholder:text-transparent select-none hover:border-muted-foreground/30 hover:bg-primary/5'
-      "
-    />
-    <button v-if="searchActive" @click="closeSearch" class="absolute right-1.5 text-muted-foreground transition-colors hover:text-foreground">
-      <X :size="13" />
-    </button>
+    <Tooltip>
+      <TooltipTrigger as-child>
+        <input
+          ref="searchInputRef"
+          :value="searchQuery ?? ''"
+          type="text"
+          :placeholder="props.placeholder ?? t('components.viewHeader.searchPlaceholder')"
+          :aria-label="t('common.search')"
+          class="h-8 text-[13px] transition-all duration-300 focus:outline-none"
+          :class="
+            searchActive
+              ? 'w-44 cursor-text rounded-lg border border-primary/30 bg-primary/5 pl-8 pr-6 text-foreground placeholder:text-muted-foreground focus:ring-1 focus:ring-primary/30 lg:w-72'
+              : 'w-8 cursor-pointer rounded-lg border border-input bg-transparent pl-2.25 pr-0 text-transparent placeholder:text-transparent select-none hover:border-muted-foreground/30 hover:bg-primary/5'
+          "
+          @focus="openSearch"
+          @input="handleSearchInput"
+          @keydown="handleSearchKeydown"
+        />
+      </TooltipTrigger>
+      <TooltipContent>{{ t('common.search') }}</TooltipContent>
+    </Tooltip>
+    <Tooltip v-if="searchActive">
+      <TooltipTrigger as-child>
+        <button
+          type="button"
+          :aria-label="t('common.close')"
+          class="absolute right-1.5 text-muted-foreground transition-colors hover:text-foreground"
+          @click="closeSearch"
+        >
+          <X :size="13" aria-hidden="true" />
+        </button>
+      </TooltipTrigger>
+      <TooltipContent>{{ t('common.close') }}</TooltipContent>
+    </Tooltip>
   </div>
 </template>
diff --git a/client/src/features/book/components/BookCoverCard.vue b/client/src/features/book/components/BookCoverCard.vue
index 0a773be3a..b0608fab8 100644
--- a/client/src/features/book/components/BookCoverCard.vue
+++ b/client/src/features/book/components/BookCoverCard.vue
@@ -271,6 +271,13 @@ const primaryOverlayActionIcon = computed(() => {
 })
 const primaryOverlayActionIconClass = computed(() => (thumbnailClickAction.value !== 'details' && isAudiobook.value ? 'ml-[2cqi]' : ''))
 const showExplicitReadButton = computed(() => thumbnailClickAction.value === 'details' && primaryFile.value != null && !isMissing.value)
+const readActionLabel = computed(() => {
+  if (isAudiobook.value) {
+    return hasProgress.value ? t('book.actions.continueListening') : t('book.actions.startListening')
+  }
+  return hasProgress.value ? t('book.actions.continueReading') : t('book.actions.startReading')
+})
+const primaryOverlayActionLabel = computed(() => (thumbnailClickAction.value === 'details' ? t('book.actions.bookDetails') : readActionLabel.value))
 
 function handlePrimaryOverlayAction() {
   if (thumbnailClickAction.value === 'details') {
@@ -543,29 +550,48 @@ const secondaryLabelText = computed(() => resolveBookLabel(gridCardSecondaryLabe
           >
             <!-- Top row: Quick View + explicit Read (when thumbnail click prefers details) -->
             <div class="shrink-0 flex items-center justify-end gap-1">
-              <button class="p-[3cqi] rounded-[2.5cqi] bg-black/50 hover:bg-black/30 transition-colors text-white" @click="openQuickView">
-                <PanelRight class="size-[12cqi]" />
-              </button>
-              <button
-                v-if="showExplicitReadButton"
-                class="p-[3cqi] rounded-[2.5cqi] bg-black/50 hover:bg-black/30 transition-colors text-white"
-                @click.stop="openPrimaryFileExplicit"
-              >
-                <BookOpen class="size-[12cqi]" />
-              </button>
+              <Tooltip>
+                <TooltipTrigger as-child>
+                  <button
+                    class="p-[3cqi] rounded-[2.5cqi] bg-black/50 hover:bg-black/30 transition-colors text-white"
+                    :aria-label="t('book.actions.quickView')"
+                    @click.stop="openQuickView"
+                  >
+                    <PanelRight class="size-[12cqi]" aria-hidden="true" />
+                  </button>
+                </TooltipTrigger>
+                <TooltipContent>{{ t('book.actions.quickView') }}</TooltipContent>
+              </Tooltip>
+              <Tooltip v-if="showExplicitReadButton">
+                <TooltipTrigger as-child>
+                  <button
+                    class="p-[3cqi] rounded-[2.5cqi] bg-black/50 hover:bg-black/30 transition-colors text-white"
+                    :aria-label="readActionLabel"
+                    @click.stop="openPrimaryFileExplicit"
+                  >
+                    <BookOpen class="size-[12cqi]" aria-hidden="true" />
+                  </button>
+                </TooltipTrigger>
+                <TooltipContent>{{ readActionLabel }}</TooltipContent>
+              </Tooltip>
             </div>
 
             <!-- Center: primary thumbnail action -->
             <div class="flex-1 flex items-center justify-center">
-              <button
-                v-if="showPrimaryOverlayAction"
-                data-testid="grid-card-primary-action"
-                class="size-[30cqi] flex items-center justify-center rounded-full bg-primary text-white shadow-2xl transition-all duration-300 scale-75 hover:scale-110 active:scale-90"
-                :class="[showMobileOverlay || 'group-hover:scale-100', showMobileOverlay ? 'scale-100' : '']"
-                @click.stop="handlePrimaryOverlayAction"
-              >
-                <component :is="primaryOverlayActionIcon" class="size-[16cqi]" :class="primaryOverlayActionIconClass" />
-              </button>
+              <Tooltip v-if="showPrimaryOverlayAction">
+                <TooltipTrigger as-child>
+                  <button
+                    data-testid="grid-card-primary-action"
+                    class="size-[30cqi] flex items-center justify-center rounded-full bg-primary text-white shadow-2xl transition-all duration-300 scale-75 hover:scale-110 active:scale-90"
+                    :class="[showMobileOverlay || 'group-hover:scale-100', showMobileOverlay ? 'scale-100' : '']"
+                    :aria-label="primaryOverlayActionLabel"
+                    @click.stop="handlePrimaryOverlayAction"
+                  >
+                    <component :is="primaryOverlayActionIcon" class="size-[16cqi]" :class="primaryOverlayActionIconClass" aria-hidden="true" />
+                  </button>
+                </TooltipTrigger>
+                <TooltipContent>{{ primaryOverlayActionLabel }}</TooltipContent>
+              </Tooltip>
             </div>
 
             <!-- Bottom: title/author (hover-overlay mode only) + kebab (when not in below-cover label row) -->
diff --git a/client/src/features/book/components/VirtualBookTable.vue b/client/src/features/book/components/VirtualBookTable.vue
index d1103de2d..f664c712b 100644
--- a/client/src/features/book/components/VirtualBookTable.vue
+++ b/client/src/features/book/components/VirtualBookTable.vue
@@ -589,10 +589,15 @@ function handleRowClick(book: BookCard, e: MouseEvent) {
     return
   }
   if (book.collapsedSeries) {
-    if (book.seriesId != null) router.push({ name: 'series-detail', params: { seriesId: book.seriesId } })
+    handleOpenSeries(book)
   }
 }
 
+function handleOpenSeries(book: BookCard) {
+  if (book.seriesId == null) return
+  void router.push({ name: 'series-detail', params: { seriesId: book.seriesId } })
+}
+
 function emitLockStateUpdate(book: BookCard, nextFields: BookCard['lockedFields']) {
   const updated = buildLockStateBookUpdate(loadedBooks.value, book, nextFields)
   if (!updated) return
@@ -873,7 +878,7 @@ defineExpose({
                 @click="focusTableCell(vItem.index, colIdx, $event, rowBook(vItem.index).id, col.id)"
               >
                 <template v-if="rowBook(vItem.index).collapsedSeries">
-                  <BookTableCollapsedSeriesCell :book="rowBook(vItem.index)" :col-id="col.id" />
+                  <BookTableCollapsedSeriesCell :book="rowBook(vItem.index)" :col-id="col.id" @open-series="handleOpenSeries(rowBook(vItem.index))" />
                 </template>
                 <template v-else>
                   <BookTableCellDispatcher
diff --git a/client/src/features/book/components/__tests__/BookCoverCard.spec.ts b/client/src/features/book/components/__tests__/BookCoverCard.spec.ts
index f6cc004c7..4941a19bb 100644
--- a/client/src/features/book/components/__tests__/BookCoverCard.spec.ts
+++ b/client/src/features/book/components/__tests__/BookCoverCard.spec.ts
@@ -226,6 +226,30 @@ describe('BookCoverCard — present state', () => {
     expect(routerPushMock).not.toHaveBeenCalledWith(expect.objectContaining({ name: 'reader' }))
   })
 
+  it('labels and describes the quick-view and start-reading actions', () => {
+    const wrapper = mountCard(presentBook)
+
+    expect(wrapper.get('button[aria-label="Quick View"]')).toBeTruthy()
+    expect(wrapper.get('[data-testid="grid-card-primary-action"]').attributes('aria-label')).toBe('Start reading')
+    expect(wrapper.findAll('[data-testid="tooltip-content"]').map((content) => content.text())).toEqual(
+      expect.arrayContaining(['Quick View', 'Start reading']),
+    )
+  })
+
+  it('uses a continue-reading label when the book has progress', () => {
+    const wrapper = mountCard({ ...presentBook, readingProgress: 20 })
+
+    expect(wrapper.get('[data-testid="grid-card-primary-action"]').attributes('aria-label')).toBe('Continue reading')
+  })
+
+  it('labels the explicit reading action when thumbnail clicks prefer details', () => {
+    thumbnailClickAction.value = 'details'
+    const wrapper = mountCard(presentBook)
+
+    expect(wrapper.get('[data-testid="grid-card-primary-action"]').attributes('aria-label')).toBe('Book Details')
+    expect(wrapper.get('button[aria-label="Start reading"]')).toBeTruthy()
+  })
+
   it('opens book details for missing books when thumbnail clicks prefer details', async () => {
     thumbnailClickAction.value = 'details'
     const wrapper = mountCard(missingBook)
diff --git a/client/src/features/book/components/table/BookTableCellDispatcher.vue b/client/src/features/book/components/table/BookTableCellDispatcher.vue
index 055e373ad..26026b014 100644
--- a/client/src/features/book/components/table/BookTableCellDispatcher.vue
+++ b/client/src/features/book/components/table/BookTableCellDispatcher.vue
@@ -17,6 +17,7 @@ import BookTableProgressCell from './BookTableProgressCell.vue'
 import BookTableMetadataScoreCell from './BookTableMetadataScoreCell.vue'
 import BookTableLockableCell from './BookTableLockableCell.vue'
 import BookTableBooleanCell from './BookTableBooleanCell.vue'
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import type { CellType } from '@/features/book/composables/tableColumnSchema'
 
 type NavigationDirection = 'next' | 'prev' | 'rowUp' | 'rowDown'
@@ -84,6 +85,14 @@ const lockStateClass = computed(() => {
   return 'text-muted-foreground hover:text-foreground'
 })
 
+function handleToggleAllLocks() {
+  if (props.isFullyLocked) {
+    emit('unlockAll')
+    return
+  }
+  emit('lockAll')
+}
+
 const primaryFile = computed(() => props.book.files.find((file) => file.role === 'primary') ?? props.book.files[0] ?? null)
 const isAudiobook = computed(() => primaryFile.value?.format != null && FORMAT_TO_GROUP[primaryFile.value.format] === 'audio')
 const isComic = computed(() => primaryFile.value?.format != null && FORMAT_TO_GROUP[primaryFile.value.format] === 'cbx')
@@ -91,15 +100,21 @@ const isComic = computed(() => primaryFile.value?.format != null && FORMAT_TO_GR
 
 <template>
   <template v-if="cellType === 'lockRow'">
-    <button
-      class="flex h-6 w-6 items-center justify-center rounded transition-colors hover:bg-muted"
-      :class="lockStateClass"
-      :aria-label="isFullyLocked ? t('book.table.locks.unlockAll') : t('book.table.locks.lockAll')"
-      @click.stop="isFullyLocked ? emit('unlockAll') : emit('lockAll')"
-    >
-      <Lock v-if="lockedFieldCount > 0" :size="13" />
-      <LockOpen v-else :size="13" />
-    </button>
+    <Tooltip>
+      <TooltipTrigger as-child>
+        <button
+          type="button"
+          class="flex h-6 w-6 items-center justify-center rounded transition-colors hover:bg-muted"
+          :class="lockStateClass"
+          :aria-label="isFullyLocked ? t('book.table.locks.unlockAll') : t('book.table.locks.lockAll')"
+          @click.stop="handleToggleAllLocks"
+        >
+          <Lock v-if="lockedFieldCount > 0" :size="13" aria-hidden="true" />
+          <LockOpen v-else :size="13" aria-hidden="true" />
+        </button>
+      </TooltipTrigger>
+      <TooltipContent>{{ isFullyLocked ? t('book.table.locks.unlockAll') : t('book.table.locks.lockAll') }}</TooltipContent>
+    </Tooltip>
   </template>
 
   <BookTableCoverCell
diff --git a/client/src/features/book/components/table/BookTableCollapsedSeriesCell.vue b/client/src/features/book/components/table/BookTableCollapsedSeriesCell.vue
index 7c3390058..c6624898e 100644
--- a/client/src/features/book/components/table/BookTableCollapsedSeriesCell.vue
+++ b/client/src/features/book/components/table/BookTableCollapsedSeriesCell.vue
@@ -4,6 +4,7 @@ import { useI18n } from 'vue-i18n'
 import { ChevronRight, LibraryBig } from '@lucide/vue'
 import { FORMAT_TO_GROUP, type BookCard } from '@bookorbit/types'
 import BookCoverSurface from '../BookCoverSurface.vue'
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import { useCoverVersions } from '@/features/book/composables/useCoverVersions'
 
 const props = defineProps<{
@@ -11,6 +12,10 @@ const props = defineProps<{
   colId: string
 }>()
 
+const emit = defineEmits<{
+  'open-series': []
+}>()
+
 const { t } = useI18n()
 
 const collapsed = computed(() => props.book.collapsedSeries!)
@@ -27,11 +32,22 @@ function thumbnailUrl(bookId: number): string {
   const version = bookId === props.book.id ? (props.book.updatedAt ?? props.book.addedAt) : collapsed.value.coverUpdatedAtByBookId?.[bookId]
   return coverUrl(bookId, 'thumbnail', version)
 }
+
+function handleOpenSeries() {
+  emit('open-series')
+}
 </script>
 
 <template>
   <div v-if="colId === 'lockRow'" class="flex h-6 w-6 items-center justify-center">
-    <LibraryBig :size="13" class="text-muted-foreground" />
+    <Tooltip>
+      <TooltipTrigger as-child>
+        <span role="img" tabindex="0" :aria-label="t('book.table.series.seriesRow')" class="rounded-sm focus-visible:ring-2 focus-visible:ring-ring">
+          <LibraryBig :size="13" class="text-muted-foreground" aria-hidden="true" />
+        </span>
+      </TooltipTrigger>
+      <TooltipContent>{{ t('book.table.series.seriesRow') }}</TooltipContent>
+    </Tooltip>
   </div>
 
   <div v-else-if="colId === 'readStatus'" class="flex w-full items-center px-1 py-0.5">
@@ -80,7 +96,19 @@ function thumbnailUrl(bookId: number): string {
   </div>
 
   <div v-else-if="colId === 'actions'" class="flex h-full w-6 items-center justify-center">
-    <ChevronRight :size="16" class="text-muted-foreground group-hover:text-foreground transition-colors" />
+    <Tooltip>
+      <TooltipTrigger as-child>
+        <button
+          type="button"
+          :aria-label="t('book.tableView.openSeries')"
+          class="flex h-7 w-7 items-center justify-center rounded-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring"
+          @click.stop="handleOpenSeries"
+        >
+          <ChevronRight :size="16" aria-hidden="true" />
+        </button>
+      </TooltipTrigger>
+      <TooltipContent>{{ t('book.tableView.openSeries') }}</TooltipContent>
+    </Tooltip>
   </div>
 
   <!-- Dash for all other columns -->
diff --git a/client/src/features/book/components/table/__tests__/BookTableCellDispatcher.spec.ts b/client/src/features/book/components/table/__tests__/BookTableCellDispatcher.spec.ts
index 489038d5a..990d6c443 100644
--- a/client/src/features/book/components/table/__tests__/BookTableCellDispatcher.spec.ts
+++ b/client/src/features/book/components/table/__tests__/BookTableCellDispatcher.spec.ts
@@ -67,6 +67,9 @@ function mountDispatcher(overrides: Partial<typeof baseProps> = {}) {
         Lock: { template: '<svg data-test="lock-icon" />' },
         LockOpen: { template: '<svg data-test="lock-open-icon" />' },
         BookTableCoverCell: CoverCellStub,
+        Tooltip: { template: '<div><slot /></div>' },
+        TooltipTrigger: { template: '<div><slot /></div>' },
+        TooltipContent: { template: '<div data-testid="tooltip-content"><slot /></div>' },
       },
     },
   })
@@ -79,6 +82,7 @@ describe('BookTableCellDispatcher lock row', () => {
 
     expect(button.attributes('aria-label')).toBe('Lock all fields')
     expect(button.classes()).toContain('text-muted-foreground')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Lock all fields')
 
     await button.trigger('click')
     expect(wrapper.emitted('lockAll')).toBeTruthy()
@@ -117,6 +121,7 @@ describe('BookTableCellDispatcher lock row', () => {
 
     expect(button.attributes('aria-label')).toBe('Unlock all fields')
     expect(button.classes()).toContain('text-primary')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Unlock all fields')
 
     await button.trigger('click')
     expect(wrapper.emitted('unlockAll')).toBeTruthy()
diff --git a/client/src/features/book/components/table/__tests__/BookTableCollapsedSeriesCell.spec.ts b/client/src/features/book/components/table/__tests__/BookTableCollapsedSeriesCell.spec.ts
index b508462fe..a379bddbc 100644
--- a/client/src/features/book/components/table/__tests__/BookTableCollapsedSeriesCell.spec.ts
+++ b/client/src/features/book/components/table/__tests__/BookTableCollapsedSeriesCell.spec.ts
@@ -58,10 +58,17 @@ const CoverSurfaceStub = {
   template: '<div data-testid="surface" :data-comic="isComic"><slot /></div>',
 }
 
-function mountCell(format: string | null) {
+function mountCell(format: string | null, colId = 'cover') {
   return mount(BookTableCollapsedSeriesCell, {
-    props: { book: makeBook(format), colId: 'cover' as never },
-    global: { stubs: { BookCoverSurface: CoverSurfaceStub } },
+    props: { book: makeBook(format), colId },
+    global: {
+      stubs: {
+        BookCoverSurface: CoverSurfaceStub,
+        Tooltip: { template: '<div><slot /></div>' },
+        TooltipTrigger: { template: '<div><slot /></div>' },
+        TooltipContent: { template: '<div data-testid="tooltip-content"><slot /></div>' },
+      },
+    },
   })
 }
 
@@ -88,4 +95,23 @@ describe('BookTableCollapsedSeriesCell comic flag', () => {
     expect(imgs[0]!.attributes('src')).toBe('/api/v1/books/10/thumbnail?t=1704067200000')
     expect(imgs[1]!.attributes('src')).toBe('/api/v1/books/11/thumbnail?t=1706745600000')
   })
+
+  it('identifies the series marker with a keyboard-triggered tooltip', () => {
+    const wrapper = mountCell('epub', 'lockRow')
+    const marker = wrapper.get('[role="img"]')
+
+    expect(marker.attributes('aria-label')).toBe('Series row')
+    expect(marker.attributes('tabindex')).toBe('0')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Series row')
+  })
+
+  it('offers a labeled button to open the series', async () => {
+    const wrapper = mountCell('epub', 'actions')
+    const button = wrapper.get('button')
+
+    expect(button.attributes('aria-label')).toBe('Open series')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Open series')
+    await button.trigger('click')
+    expect(wrapper.emitted('open-series')).toEqual([[]])
+  })
 })
diff --git a/client/src/features/notifications/components/NotificationSheet.spec.ts b/client/src/features/notifications/components/NotificationSheet.spec.ts
new file mode 100644
index 000000000..e2223b076
--- /dev/null
+++ b/client/src/features/notifications/components/NotificationSheet.spec.ts
@@ -0,0 +1,44 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it, vi } from 'vitest'
+import { ref } from 'vue'
+import NotificationSheet from './NotificationSheet.vue'
+
+vi.mock('../composables/useNotifications', () => ({
+  useNotifications: () => ({
+    notifications: ref([]),
+    unreadCount: ref(0),
+    loading: ref(false),
+    hasMore: ref(false),
+    fetchNotifications: vi.fn<(reset?: boolean) => Promise<void>>().mockResolvedValue(undefined),
+    markAsRead: vi.fn<(id: number) => Promise<void>>().mockResolvedValue(undefined),
+    markAllAsRead: vi.fn<() => Promise<void>>().mockResolvedValue(undefined),
+    dismiss: vi.fn<(id: number) => Promise<void>>().mockResolvedValue(undefined),
+    clearAll: vi.fn<() => Promise<void>>().mockResolvedValue(undefined),
+  }),
+}))
+
+const stubs = {
+  Button: { template: '<button type="button"><slot /></button>' },
+  Sheet: { template: '<div><slot /></div>' },
+  SheetTrigger: { template: '<div><slot /></div>' },
+  SheetContent: { template: '<div><slot /></div>' },
+  SheetDescription: { template: '<div><slot /></div>' },
+  SheetHeader: { template: '<div><slot /></div>' },
+  SheetTitle: { template: '<div><slot /></div>' },
+  Tooltip: { template: '<div><slot /></div>' },
+  TooltipTrigger: { template: '<div><slot /></div>' },
+  TooltipContent: { template: '<div data-testid="tooltip-content"><slot /></div>' },
+  NotificationItemVue: { template: '<div />' },
+}
+
+describe('NotificationSheet trigger', () => {
+  it('provides an accessible name and matching tooltip', () => {
+    const wrapper = mount(NotificationSheet, {
+      props: { iconRadiusClass: 'rounded-md' },
+      global: { stubs },
+    })
+
+    expect(wrapper.get('button').attributes('aria-label')).toBe('Notifications')
+    expect(wrapper.get('[data-testid="tooltip-content"]').text()).toBe('Notifications')
+  })
+})
diff --git a/client/src/features/notifications/components/NotificationSheet.vue b/client/src/features/notifications/components/NotificationSheet.vue
index f1a8e57ed..1a3061ce7 100644
--- a/client/src/features/notifications/components/NotificationSheet.vue
+++ b/client/src/features/notifications/components/NotificationSheet.vue
@@ -4,6 +4,7 @@ import { useI18n } from 'vue-i18n'
 import { Bell, BellOff, CheckCheck, Trash2 } from '@lucide/vue'
 import { Sheet, SheetContent, SheetDescription, SheetHeader, SheetTitle, SheetTrigger } from '@/components/ui/sheet'
 import { Button } from '@/components/ui/button'
+import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import { useNotifications } from '../composables/useNotifications'
 import NotificationItemVue from './NotificationItem.vue'
 
@@ -43,62 +44,80 @@ function handleLoadMore() {
 </script>
 
 <template>
-  <Sheet v-model:open="sheetOpen">
-    <SheetTrigger as-child>
-      <Button
-        variant="ghost"
-        size="icon"
-        class="relative h-8 w-8 border border-(--shell-accent-line) text-foreground transition-colors duration-150 hover:bg-(--shell-accent-wash)"
-        :class="iconRadiusClass"
-      >
-        <Bell :size="15" />
-        <span
-          v-if="unreadCount > 0"
-          class="absolute -top-1 -right-1 flex h-4 min-w-4 items-center justify-center rounded-full bg-primary px-1 text-[11px] font-semibold text-primary-foreground tabular-nums leading-none"
-        >
-          {{ unreadCount > 99 ? '99+' : unreadCount }}
-        </span>
-      </Button>
-    </SheetTrigger>
-
-    <SheetContent side="right" class="w-[90vw] sm:max-w-md p-0 flex flex-col gap-0">
-      <SheetHeader class="flex flex-row items-center justify-between border-b px-4 py-3 h-14 shrink-0 space-y-0">
-        <div>
-          <SheetTitle class="text-sm font-semibold text-foreground">{{ t('notifications.title') }}</SheetTitle>
-          <SheetDescription class="sr-only">{{ t('notifications.description') }}</SheetDescription>
-        </div>
-        <div class="flex items-center gap-1 pr-8">
-          <Button v-if="unreadCount > 0" variant="ghost" size="sm" class="h-7 gap-1.5 text-xs text-muted-foreground" @click="handleMarkAllRead">
-            <CheckCheck :size="14" />
-            {{ t('notifications.markAllRead') }}
+  <Tooltip>
+    <Sheet v-model:open="sheetOpen">
+      <TooltipTrigger as-child>
+        <SheetTrigger as-child>
+          <Button
+            variant="ghost"
+            size="icon"
+            class="relative h-8 w-8 border border-(--shell-accent-line) text-foreground transition-colors duration-150 hover:bg-(--shell-accent-wash)"
+            :class="iconRadiusClass"
+            :aria-label="t('notifications.title')"
+          >
+            <Bell :size="15" aria-hidden="true" />
+            <span
+              v-if="unreadCount > 0"
+              class="absolute -top-1 -right-1 flex h-4 min-w-4 items-center justify-center rounded-full bg-primary px-1 text-[11px] font-semibold text-primary-foreground tabular-nums leading-none"
+            >
+              {{ unreadCount > 99 ? '99+' : unreadCount }}
+            </span>
           </Button>
-          <Button v-if="notifications.length > 0" variant="ghost" size="sm" class="h-7 gap-1.5 text-xs text-muted-foreground" @click="handleClearAll">
-            <Trash2 :size="14" />
-            {{ t('notifications.clear') }}
-          </Button>
-        </div>
-      </SheetHeader>
+        </SheetTrigger>
+      </TooltipTrigger>
 
-      <div class="flex-1 overflow-y-auto min-h-0">
-        <div v-if="notifications.length === 0 && !loading" class="flex flex-col items-center justify-center py-20 text-muted-foreground">
-          <BellOff :size="32" class="mb-4 opacity-20" />
-          <p class="text-sm">{{ t('notifications.empty') }}</p>
-        </div>
+      <SheetContent side="right" class="w-[90vw] sm:max-w-md p-0 flex flex-col gap-0">
+        <SheetHeader class="flex flex-row items-center justify-between border-b px-4 py-3 h-14 shrink-0 space-y-0">
+          <div>
+            <SheetTitle class="text-sm font-semibold text-foreground">{{ t('notifications.title') }}</SheetTitle>
+            <SheetDescription class="sr-only">{{ t('notifications.description') }}</SheetDescription>
+          </div>
+          <div class="flex items-center gap-1 pr-8">
+            <Button v-if="unreadCount > 0" variant="ghost" size="sm" class="h-7 gap-1.5 text-xs text-muted-foreground" @click="handleMarkAllRead">
+              <CheckCheck :size="14" />
+              {{ t('notifications.markAllRead') }}
+            </Button>
+            <Button
+              v-if="notifications.length > 0"
+              variant="ghost"
+              size="sm"
+              class="h-7 gap-1.5 text-xs text-muted-foreground"
+              @click="handleClearAll"
+            >
+              <Trash2 :size="14" />
+              {{ t('notifications.clear') }}
+            </Button>
+          </div>
+        </SheetHeader>
 
-        <div v-else class="flex flex-col gap-1.5 px-2 py-2">
-          <NotificationItemVue v-for="item in notifications" :key="item.id" :notification="item" @read="handleMarkAsRead" @dismiss="handleDismiss" />
-        </div>
+        <div class="flex-1 overflow-y-auto min-h-0">
+          <div v-if="notifications.length === 0 && !loading" class="flex flex-col items-center justify-center py-20 text-muted-foreground">
+            <BellOff :size="32" class="mb-4 opacity-20" />
+            <p class="text-sm">{{ t('notifications.empty') }}</p>
+          </div>
 
-        <div v-if="loading" class="flex justify-center py-8">
-          <div class="h-6 w-6 animate-spin rounded-full border-2 border-primary border-t-transparent" />
-        </div>
+          <div v-else class="flex flex-col gap-1.5 px-2 py-2">
+            <NotificationItemVue
+              v-for="item in notifications"
+              :key="item.id"
+              :notification="item"
+              @read="handleMarkAsRead"
+              @dismiss="handleDismiss"
+            />
+          </div>
 
-        <div v-if="hasMore && !loading" class="p-4">
-          <Button variant="ghost" size="sm" class="w-full text-xs text-muted-foreground border border-dashed" @click="handleLoadMore">
-            {{ t('notifications.loadMore') }}
-          </Button>
+          <div v-if="loading" class="flex justify-center py-8">
+            <div class="h-6 w-6 animate-spin rounded-full border-2 border-primary border-t-transparent" />
+          </div>
+
+          <div v-if="hasMore && !loading" class="p-4">
+            <Button variant="ghost" size="sm" class="w-full text-xs text-muted-foreground border border-dashed" @click="handleLoadMore">
+              {{ t('notifications.loadMore') }}
+            </Button>
+          </div>
         </div>
-      </div>
-    </SheetContent>
-  </Sheet>
+      </SheetContent>
+    </Sheet>
+    <TooltipContent>{{ t('notifications.title') }}</TooltipContent>
+  </Tooltip>
 </template>
diff --git a/client/src/locales/en.json b/client/src/locales/en.json
index 9a14f2c0a..bcd4e8df9 100644
--- a/client/src/locales/en.json
+++ b/client/src/locales/en.json
@@ -4535,6 +4535,10 @@
     "actions": {
       "read": "Read",
       "listen": "Listen",
+      "startReading": "Start reading",
+      "continueReading": "Continue reading",
+      "startListening": "Start listening",
+      "continueListening": "Continue listening",
       "peek": "Peek",
       "quickView": "Quick View",
       "details": "Details",
@@ -5922,6 +5926,7 @@
         "unread": "Unread"
       },
       "series": {
+        "seriesRow": "Series row",
         "bookCount": "{count, plural, =0 {(no books)} one {(# book)} other {(# books)}}",
         "readOfCount": "{read} of {total} read"
       },
@@ -7236,7 +7241,11 @@
       "sidebar": {
         "title": "Sidebar",
         "mobileDescription": "Displays the mobile sidebar.",
-        "toggle": "Toggle Sidebar"
+        "toggle": "Toggle Sidebar",
+        "collapse": "Collapse sidebar",
+        "expand": "Expand sidebar",
+        "open": "Open sidebar",
+        "close": "Close sidebar"
       },
       "chipInput": {
         "typeAndEnter": "Type and press Enter to add",