fix(skill): improve accessibility for file tree and tabs

- Convert div with onClick to proper button elements for keyboard access
- Add focus-visible ring styles to all interactive elements
- Add ARIA attributes (role, aria-selected, aria-expanded) to tree nodes
- Add keyboard navigation (Enter/Space) support to tree items
- Mark decorative icons with aria-hidden="true"
- Add missing i18n keys for accessibility labels
- Fix typography: use ellipsis character (…) instead of three dots

web/app/components/workflow/skill/editor-tab-item.tsx

@@ -42,39 +42,48 @@ const EditorTabItem: FC<EditorTabItemProps> = ({
   return (
     <div
       className={cn(
-        'group relative flex shrink-0 cursor-pointer items-center gap-1.5 border-r border-components-panel-border-subtle px-2.5 pb-2 pt-2.5',
+        'group relative flex shrink-0 items-center border-r border-components-panel-border-subtle',
         isActive ? 'bg-components-panel-bg' : 'bg-transparent hover:bg-state-base-hover',
       )}
-      onClick={handleClick}
     >
-      <div className="relative flex size-5 shrink-0 items-center justify-center">
-        <FileTypeIcon type={iconType as FileAppearanceType} size="sm" />
-        {isDirty && (
-          <span className="absolute -bottom-px -right-px size-[7px] rounded-full border border-white bg-text-warning-secondary" />
-        )}
-      </div>
-
-      <span
+      <button
+        type="button"
         className={cn(
-          'max-w-40 truncate text-[13px] font-normal leading-4',
-          isActive
-            ? 'text-text-primary'
-            : 'text-text-tertiary',
+          'flex items-center gap-1.5 px-2.5 pb-2 pt-2.5',
+          'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-components-input-border-active',
         )}
+        onClick={handleClick}
       >
-        {name}
-      </span>
+        <div className="relative flex size-5 shrink-0 items-center justify-center">
+          <FileTypeIcon type={iconType as FileAppearanceType} size="sm" />
+          {isDirty && (
+            <span className="absolute -bottom-px -right-px size-[7px] rounded-full border border-white bg-text-warning-secondary" />
+          )}
+        </div>
+
+        <span
+          className={cn(
+            'max-w-40 truncate text-[13px] font-normal leading-4',
+            isActive
+              ? 'text-text-primary'
+              : 'text-text-tertiary',
+          )}
+        >
+          {name}
+        </span>
+      </button>
 
       <button
         type="button"
         className={cn(
-          'ml-0.5 flex size-4 items-center justify-center rounded-[6px] text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary',
-          isActive ? 'opacity-100' : 'opacity-0 group-hover:opacity-100',
+          'mr-1 flex size-4 items-center justify-center rounded-[6px] text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary',
+          'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-components-input-border-active',
+          isActive ? 'opacity-100' : 'opacity-0 focus-visible:opacity-100 group-hover:opacity-100',
         )}
         aria-label={t('operation.close', { ns: 'common' })}
         onClick={handleClose}
       >
-        <RiCloseLine className="size-4" />
+        <RiCloseLine className="size-4" aria-hidden="true" />
       </button>
     </div>
   )

web/app/components/workflow/skill/file-node-menu.tsx

@@ -28,9 +28,10 @@ const MenuItem: React.FC<MenuItemProps> = ({ icon: Icon, label, onClick, disable
     className={cn(
       'flex w-full items-center gap-2 rounded-lg px-3 py-2',
       'hover:bg-state-base-hover disabled:cursor-not-allowed disabled:opacity-50',
+      'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-components-input-border-active',
     )}
   >
-    <Icon className="size-4 text-text-tertiary" />
+    <Icon className="size-4 text-text-tertiary" aria-hidden="true" />
     <span className="system-sm-regular text-text-secondary">
       {label}
     </span>
@@ -84,10 +85,11 @@ const FileItemMenu: FC<FileItemMenuProps> = ({
         className={cn(
           'flex w-full items-center gap-2 rounded-lg px-3 py-2',
           'hover:bg-state-destructive-hover disabled:cursor-not-allowed disabled:opacity-50',
+          'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-components-input-border-active',
           'group',
         )}
       >
-        <RiDeleteBinLine className="size-4 text-text-tertiary group-hover:text-text-destructive" />
+        <RiDeleteBinLine className="size-4 text-text-tertiary group-hover:text-text-destructive" aria-hidden="true" />
         <span className="system-sm-regular text-text-secondary group-hover:text-text-destructive">
           {t('skillSidebar.menu.delete')}
         </span>

web/app/components/workflow/skill/folder-node-menu.tsx

@@ -32,9 +32,10 @@ const MenuItem: React.FC<MenuItemProps> = ({ icon: Icon, label, onClick, disable
     className={cn(
       'flex w-full items-center gap-2 rounded-lg px-3 py-2',
       'hover:bg-state-base-hover disabled:cursor-not-allowed disabled:opacity-50',
+      'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-components-input-border-active',
     )}
   >
-    <Icon className="size-4 text-text-tertiary" />
+    <Icon className="size-4 text-text-tertiary" aria-hidden="true" />
     <span className="system-sm-regular text-text-secondary">
       {label}
     </span>
@@ -142,10 +143,11 @@ const FileOperationsMenu: FC<FileOperationsMenuProps> = ({
             className={cn(
               'flex w-full items-center gap-2 rounded-lg px-3 py-2',
               'hover:bg-state-destructive-hover disabled:cursor-not-allowed disabled:opacity-50',
+              'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-components-input-border-active',
               'group',
             )}
           >
-            <RiDeleteBinLine className="size-4 text-text-tertiary group-hover:text-text-destructive" />
+            <RiDeleteBinLine className="size-4 text-text-tertiary group-hover:text-text-destructive" aria-hidden="true" />
             <span className="system-sm-regular text-text-secondary group-hover:text-text-destructive">
               {t('skillSidebar.menu.delete')}
             </span>

web/app/components/workflow/skill/sidebar-search-add.tsx

@@ -40,9 +40,10 @@ const MenuItem: React.FC<MenuItemProps> = ({ icon: Icon, label, onClick, disable
     className={cn(
       'flex w-full items-center gap-2 rounded-lg px-3 py-2',
       'hover:bg-state-base-hover disabled:cursor-not-allowed disabled:opacity-50',
+      'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-components-input-border-active',
     )}
   >
-    <Icon className="size-4 text-text-tertiary" />
+    <Icon className="size-4 text-text-tertiary" aria-hidden="true" />
     <span className="system-sm-regular text-text-secondary">
       {label}
     </span>
@@ -99,7 +100,7 @@ const SidebarSearchAdd: FC = () => {
             className={cn('!h-8 !w-8 !px-0')}
             aria-label={t('operation.add', { ns: 'common' })}
           >
-            <RiAddLine className="h-4 w-4" />
+            <RiAddLine className="h-4 w-4" aria-hidden="true" />
           </Button>
         </PortalToFollowElemTrigger>
         <PortalToFollowElemContent className="z-[30]">

web/app/components/workflow/skill/tree-node.tsx

@@ -6,6 +6,7 @@ import type { FileAppearanceType } from '@/app/components/base/file-uploader/typ
 import { RiFolderLine, RiFolderOpenLine, RiMoreFill } from '@remixicon/react'
 import * as React from 'react'
 import { useCallback, useState } from 'react'
+import { useTranslation } from 'react-i18next'
 import FileTypeIcon from '@/app/components/base/file-uploader/file-type-icon'
 import {
   PortalToFollowElem,
@@ -19,6 +20,7 @@ import { useSkillEditorStore, useSkillEditorStoreApi } from './store'
 import { getFileIconType } from './utils/file-utils'
 
 const TreeNode = ({ node, style, dragHandle }: NodeRendererProps<TreeNodeData>) => {
+  const { t } = useTranslation('workflow')
   const isFolder = node.data.node_type === 'folder'
   const isSelected = node.isSelected
   const isDirty = useSkillEditorStore(s => s.dirtyContents.has(node.data.id))
@@ -62,18 +64,34 @@ const TreeNode = ({ node, style, dragHandle }: NodeRendererProps<TreeNodeData>)
     setShowDropdown(prev => !prev)
   }, [])
 
+  const handleKeyDown = useCallback((e: React.KeyboardEvent) => {
+    if (e.key === 'Enter' || e.key === ' ') {
+      e.preventDefault()
+      if (isFolder)
+        node.toggle()
+      else
+        node.activate()
+    }
+  }, [isFolder, node])
+
   return (
     <div
       ref={dragHandle}
       style={style}
+      role="treeitem"
+      tabIndex={0}
+      aria-selected={isSelected}
+      aria-expanded={isFolder ? node.isOpen : undefined}
       className={cn(
         'group flex h-6 cursor-pointer items-center gap-2 rounded-md px-2',
         'hover:bg-state-base-hover',
+        'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-components-input-border-active',
         isSelected && 'bg-state-base-active',
         hasContextMenu && !isSelected && 'bg-state-base-hover',
       )}
       onClick={handleClick}
       onDoubleClick={handleDoubleClick}
+      onKeyDown={handleKeyDown}
       onContextMenu={handleContextMenu}
     >
       <div className="flex size-5 shrink-0 items-center justify-center">
@@ -81,12 +99,17 @@ const TreeNode = ({ node, style, dragHandle }: NodeRendererProps<TreeNodeData>)
           ? (
               <button
                 type="button"
+                tabIndex={-1}
                 onClick={handleToggle}
-                className="flex size-full items-center justify-center"
+                aria-label={t('skillSidebar.toggleFolder')}
+                className={cn(
+                  'flex size-full items-center justify-center rounded',
+                  'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-components-input-border-active',
+                )}
               >
                 {node.isOpen
-                  ? <RiFolderOpenLine className="size-4 text-text-accent" />
-                  : <RiFolderLine className="size-4 text-text-secondary" />}
+                  ? <RiFolderOpenLine className="size-4 text-text-accent" aria-hidden="true" />
+                  : <RiFolderLine className="size-4 text-text-secondary" aria-hidden="true" />}
               </button>
             )
           : (
@@ -119,16 +142,18 @@ const TreeNode = ({ node, style, dragHandle }: NodeRendererProps<TreeNodeData>)
         <PortalToFollowElemTrigger asChild>
           <button
             type="button"
+            tabIndex={-1}
             onClick={handleMoreClick}
             className={cn(
               'flex size-5 shrink-0 items-center justify-center rounded',
               'hover:bg-state-base-hover-alt',
-              'invisible group-hover:visible',
+              'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-components-input-border-active',
+              'invisible focus-visible:visible group-hover:visible',
               showDropdown && 'visible',
             )}
-            aria-label="File operations"
+            aria-label={t('skillSidebar.menu.moreActions')}
           >
-            <RiMoreFill className="size-4 text-text-tertiary" />
+            <RiMoreFill className="size-4 text-text-tertiary" aria-hidden="true" />
           </button>
         </PortalToFollowElemTrigger>
         <PortalToFollowElemContent className="z-[100]">