new chat icon/shortcut, workspaces, and knowledge browsing

Move new chat to a top-bar icon with a Cmd+N shortcut, introduce the
Workspaces concept (workspace sidebar + default the working-directory
picker to it), and expand the knowledge browser (view more).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/x/apps/renderer/src/App.tsx

@@ -5,7 +5,7 @@ import { RunEvent, ListRunsResponse } from '@x/shared/src/runs.js';
 import type { LanguageModelUsage, ToolUIPart } from 'ai';
 import './App.css'
 import z from 'zod';
-import { CheckIcon, LoaderIcon, PanelLeftIcon, Maximize2, Minimize2, ChevronLeftIcon, ChevronRightIcon, SquarePen, HistoryIcon } from 'lucide-react';
+import { CheckIcon, LoaderIcon, PanelLeftIcon, Maximize2, Minimize2, ChevronLeftIcon, ChevronRightIcon, SquarePen, SearchIcon, HistoryIcon } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import { MarkdownEditor, type MarkdownEditorHandle } from './components/markdown-editor';
 import { ChatSidebar } from './components/chat-sidebar';
@@ -25,6 +25,8 @@ import { SuggestedTopicsView } from '@/components/suggested-topics-view';
 import { LiveNotesView } from '@/components/live-notes-view';
 import { BgTasksView } from '@/components/bg-tasks-view';
 import { EmailView } from '@/components/email-view';
+import { WorkspaceView } from '@/components/workspace-view';
+import { KnowledgeView } from '@/components/knowledge-view';
 import { MeetingsView } from '@/components/meetings-view';
 import { SidebarSectionProvider } from '@/contexts/sidebar-context';
 import {
@@ -184,6 +186,9 @@ const MEETINGS_TAB_PATH = '__rowboat_meetings__'
 const LIVE_NOTES_TAB_PATH = '__rowboat_live_notes__'
 const BG_TASKS_TAB_PATH = '__rowboat_bg_tasks__'
 const EMAIL_TAB_PATH = '__rowboat_email__'
+const WORKSPACE_TAB_PATH = '__rowboat_workspace__'
+const WORKSPACE_ROOT = 'knowledge/Workspace'
+const KNOWLEDGE_VIEW_TAB_PATH = '__rowboat_knowledge_view__'
 const BASES_DEFAULT_TAB_PATH = '__rowboat_bases_default__'
 
 const clampNumber = (value: number, min: number, max: number) =>
@@ -317,6 +322,8 @@ const isMeetingsTabPath = (path: string) => path === MEETINGS_TAB_PATH
 const isLiveNotesTabPath = (path: string) => path === LIVE_NOTES_TAB_PATH
 const isBgTasksTabPath = (path: string) => path === BG_TASKS_TAB_PATH
 const isEmailTabPath = (path: string) => path === EMAIL_TAB_PATH
+const isWorkspaceTabPath = (path: string) => path === WORKSPACE_TAB_PATH
+const isKnowledgeViewTabPath = (path: string) => path === KNOWLEDGE_VIEW_TAB_PATH
 const isBaseFilePath = (path: string) => path.endsWith('.base') || path === BASES_DEFAULT_TAB_PATH
 
 const getSuggestedTopicTargetFolder = (category?: string) => {
@@ -567,12 +574,15 @@ type ViewState =
   | { type: 'meetings' }
   | { type: 'live-notes' }
   | { type: 'email' }
+  | { type: 'workspace'; path?: string }
+  | { type: 'knowledge-view' }
 
 function viewStatesEqual(a: ViewState, b: ViewState): boolean {
   if (a.type !== b.type) return false
   if (a.type === 'chat' && b.type === 'chat') return a.runId === b.runId
   if (a.type === 'file' && b.type === 'file') return a.path === b.path
   if (a.type === 'task' && b.type === 'task') return a.name === b.name
+  if (a.type === 'workspace' && b.type === 'workspace') return (a.path ?? '') === (b.path ?? '')
   return true // both graph
 }
 
@@ -616,6 +626,12 @@ function parseDeepLink(input: string): ViewState | null {
       return { type: 'meetings' }
     case 'live-notes':
       return { type: 'live-notes' }
+    case 'workspace': {
+      const path = params.get('path')
+      return { type: 'workspace', path: path ?? undefined }
+    }
+    case 'knowledge-view':
+      return { type: 'knowledge-view' }
     default:
       return null
   }
@@ -624,12 +640,16 @@ function parseDeepLink(input: string): ViewState | null {
 /** Sidebar toggle (fixed position, top-left) */
 function FixedSidebarToggle({
   leftInsetPx,
+  onNewChat,
+  onOpenSearch,
 }: {
   leftInsetPx: number
+  onNewChat?: () => void
+  onOpenSearch?: () => void
 }) {
   const { toggleSidebar } = useSidebar()
   return (
-    <div className="fixed left-0 top-0 z-50 flex h-10 items-center" style={{ WebkitAppRegion: 'no-drag' } as React.CSSProperties}>
+    <div className="fixed left-0 top-0 z-50 flex h-10 items-center gap-1" style={{ WebkitAppRegion: 'no-drag' } as React.CSSProperties}>
       <div aria-hidden="true" className="h-10 shrink-0" style={{ width: leftInsetPx }} />
       {/* Sidebar toggle */}
       <button
@@ -641,6 +661,28 @@ function FixedSidebarToggle({
       >
         <PanelLeftIcon className="size-5" />
       </button>
+      {onNewChat && (
+        <button
+          type="button"
+          onClick={onNewChat}
+          className="flex h-8 w-8 items-center justify-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground transition-colors"
+          aria-label="New chat"
+          title="New chat"
+        >
+          <SquarePen className="size-5" />
+        </button>
+      )}
+      {onOpenSearch && (
+        <button
+          type="button"
+          onClick={onOpenSearch}
+          className="flex h-8 w-8 items-center justify-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground transition-colors"
+          aria-label="Search"
+          title="Search"
+        >
+          <SearchIcon className="size-5" />
+        </button>
+      )}
     </div>
   )
 }
@@ -725,6 +767,9 @@ function App() {
   const [isLiveNotesOpen, setIsLiveNotesOpen] = useState(false)
   const [isBgTasksOpen, setIsBgTasksOpen] = useState(false)
   const [isEmailOpen, setIsEmailOpen] = useState(false)
+  const [isWorkspaceOpen, setIsWorkspaceOpen] = useState(false)
+  const [workspaceInitialPath, setWorkspaceInitialPath] = useState<string | null>(null)
+  const [isKnowledgeViewOpen, setIsKnowledgeViewOpen] = useState(false)
   const [expandedFrom, setExpandedFrom] = useState<{
     path: string | null
     graph: boolean
@@ -1079,6 +1124,8 @@ function App() {
     if (isLiveNotesTabPath(tab.path)) return 'Live notes'
     if (isBgTasksTabPath(tab.path)) return 'Background tasks'
     if (isEmailTabPath(tab.path)) return 'Email'
+    if (isWorkspaceTabPath(tab.path)) return 'Workspace'
+    if (isKnowledgeViewTabPath(tab.path)) return 'Knowledge'
     if (tab.path === BASES_DEFAULT_TAB_PATH) return 'Bases'
     if (tab.path.endsWith('.base')) return tab.path.split('/').pop()?.replace(/\.base$/i, '') || 'Base'
     return tab.path.split('/').pop()?.replace(/\.md$/i, '') || tab.path
@@ -2793,7 +2840,7 @@ function App() {
       setActiveFileTabId(existingTab.id)
       setIsGraphOpen(false)
       setIsSuggestedTopicsOpen(false)
-      setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+      setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
       setSelectedPath(path)
       return
     }
@@ -2802,7 +2849,7 @@ function App() {
     setActiveFileTabId(id)
     setIsGraphOpen(false)
     setIsSuggestedTopicsOpen(false)
-    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
     setSelectedPath(path)
   }, [fileTabs, dismissBrowserOverlay])
 
@@ -2821,14 +2868,14 @@ function App() {
       setSelectedPath(null)
       setIsGraphOpen(true)
       setIsSuggestedTopicsOpen(false)
-      setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+      setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
       return
     }
     if (isSuggestedTopicsTabPath(tab.path)) {
       setSelectedPath(null)
       setIsGraphOpen(false)
       setIsSuggestedTopicsOpen(true)
-      setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+      setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
       return
     }
     if (isLiveNotesTabPath(tab.path)) {
@@ -2838,6 +2885,8 @@ function App() {
       setIsMeetingsOpen(false)
       setIsBgTasksOpen(false)
       setIsEmailOpen(false)
+      setIsWorkspaceOpen(false)
+      setIsKnowledgeViewOpen(false)
       setIsLiveNotesOpen(true)
       return
     }
@@ -2847,6 +2896,9 @@ function App() {
       setIsSuggestedTopicsOpen(false)
       setIsMeetingsOpen(false)
       setIsLiveNotesOpen(false)
+      setIsEmailOpen(false)
+      setIsWorkspaceOpen(false)
+      setIsKnowledgeViewOpen(false)
       setIsBgTasksOpen(true)
       return
     }
@@ -2857,26 +2909,56 @@ function App() {
       setIsMeetingsOpen(true)
       setIsLiveNotesOpen(false)
       setIsBgTasksOpen(false)
+      setIsEmailOpen(false)
+      setIsWorkspaceOpen(false)
+      setIsKnowledgeViewOpen(false)
       return
     }
     if (isEmailTabPath(tab.path)) {
       setSelectedPath(null)
       setIsGraphOpen(false)
       setIsSuggestedTopicsOpen(false)
+      setIsMeetingsOpen(false)
       setIsLiveNotesOpen(false)
       setIsBgTasksOpen(false)
+      setIsWorkspaceOpen(false)
+      setIsKnowledgeViewOpen(false)
       setIsEmailOpen(true)
       return
     }
+    if (isWorkspaceTabPath(tab.path)) {
+      setSelectedPath(null)
+      setIsGraphOpen(false)
+      setIsSuggestedTopicsOpen(false)
+      setIsMeetingsOpen(false)
+      setIsLiveNotesOpen(false)
+      setIsBgTasksOpen(false)
+      setIsEmailOpen(false)
+      setIsKnowledgeViewOpen(false)
+      setIsWorkspaceOpen(true)
+      return
+    }
+    if (isKnowledgeViewTabPath(tab.path)) {
+      setSelectedPath(null)
+      setIsGraphOpen(false)
+      setIsSuggestedTopicsOpen(false)
+      setIsMeetingsOpen(false)
+      setIsLiveNotesOpen(false)
+      setIsBgTasksOpen(false)
+      setIsEmailOpen(false)
+      setIsWorkspaceOpen(false)
+      setIsKnowledgeViewOpen(true)
+      return
+    }
     setIsGraphOpen(false)
     setIsSuggestedTopicsOpen(false)
-    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
     setSelectedPath(tab.path)
   }, [fileTabs, isRightPaneMaximized, dismissBrowserOverlay])
 
   const closeFileTab = useCallback((tabId: string) => {
     const closingTab = fileTabs.find(t => t.id === tabId)
-    if (closingTab && !isGraphTabPath(closingTab.path) && !isSuggestedTopicsTabPath(closingTab.path) && !isLiveNotesTabPath(closingTab.path) && !isBgTasksTabPath(closingTab.path) && !isEmailTabPath(closingTab.path) && !isBaseFilePath(closingTab.path)) {
+    if (closingTab && !isGraphTabPath(closingTab.path) && !isSuggestedTopicsTabPath(closingTab.path) && !isLiveNotesTabPath(closingTab.path) && !isBgTasksTabPath(closingTab.path) && !isEmailTabPath(closingTab.path) && !isWorkspaceTabPath(closingTab.path) && !isKnowledgeViewTabPath(closingTab.path) && !isBaseFilePath(closingTab.path)) {
       removeEditorCacheForPath(closingTab.path)
       initialContentByPathRef.current.delete(closingTab.path)
       untitledRenameReadyPathsRef.current.delete(closingTab.path)
@@ -2899,7 +2981,7 @@ function App() {
         setSelectedPath(null)
         setIsGraphOpen(false)
         setIsSuggestedTopicsOpen(false)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
           return []
       }
       const idx = prev.findIndex(t => t.id === tabId)
@@ -2913,12 +2995,12 @@ function App() {
           setSelectedPath(null)
           setIsGraphOpen(true)
           setIsSuggestedTopicsOpen(false)
-          setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+          setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         } else if (isSuggestedTopicsTabPath(newActiveTab.path)) {
           setSelectedPath(null)
           setIsGraphOpen(false)
           setIsSuggestedTopicsOpen(true)
-          setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+          setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         } else if (isMeetingsTabPath(newActiveTab.path)) {
           setSelectedPath(null)
           setIsGraphOpen(false)
@@ -2927,6 +3009,8 @@ function App() {
           setIsLiveNotesOpen(false)
           setIsBgTasksOpen(false)
           setIsEmailOpen(false)
+          setIsWorkspaceOpen(false)
+          setIsKnowledgeViewOpen(false)
         } else if (isLiveNotesTabPath(newActiveTab.path)) {
           setSelectedPath(null)
           setIsGraphOpen(false)
@@ -2934,6 +3018,8 @@ function App() {
           setIsMeetingsOpen(false)
           setIsBgTasksOpen(false)
           setIsEmailOpen(false)
+          setIsWorkspaceOpen(false)
+          setIsKnowledgeViewOpen(false)
           setIsLiveNotesOpen(true)
         } else if (isBgTasksTabPath(newActiveTab.path)) {
           setSelectedPath(null)
@@ -2943,6 +3029,8 @@ function App() {
           setIsLiveNotesOpen(false)
           setIsBgTasksOpen(true)
           setIsEmailOpen(false)
+          setIsWorkspaceOpen(false)
+          setIsKnowledgeViewOpen(false)
         } else if (isEmailTabPath(newActiveTab.path)) {
           setSelectedPath(null)
           setIsGraphOpen(false)
@@ -2950,11 +3038,33 @@ function App() {
           setIsMeetingsOpen(false)
           setIsLiveNotesOpen(false)
           setIsBgTasksOpen(false)
+          setIsWorkspaceOpen(false)
+          setIsKnowledgeViewOpen(false)
           setIsEmailOpen(true)
+        } else if (isWorkspaceTabPath(newActiveTab.path)) {
+          setSelectedPath(null)
+          setIsGraphOpen(false)
+          setIsSuggestedTopicsOpen(false)
+          setIsMeetingsOpen(false)
+          setIsLiveNotesOpen(false)
+          setIsBgTasksOpen(false)
+          setIsEmailOpen(false)
+          setIsKnowledgeViewOpen(false)
+          setIsWorkspaceOpen(true)
+        } else if (isKnowledgeViewTabPath(newActiveTab.path)) {
+          setSelectedPath(null)
+          setIsGraphOpen(false)
+          setIsSuggestedTopicsOpen(false)
+          setIsMeetingsOpen(false)
+          setIsLiveNotesOpen(false)
+          setIsBgTasksOpen(false)
+          setIsEmailOpen(false)
+          setIsWorkspaceOpen(false)
+          setIsKnowledgeViewOpen(true)
         } else {
           setIsGraphOpen(false)
           setIsSuggestedTopicsOpen(false)
-          setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+          setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
               setSelectedPath(newActiveTab.path)
         }
       }
@@ -2985,7 +3095,7 @@ function App() {
     dismissBrowserOverlay()
     handleNewChat()
     // Left-pane "new chat" should always open full chat view.
-    if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen) {
+    if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen) {
       setExpandedFrom({
         path: selectedPath,
         graph: isGraphOpen,
@@ -3002,8 +3112,8 @@ function App() {
     setSelectedPath(null)
     setIsGraphOpen(false)
     setIsSuggestedTopicsOpen(false)
-    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
-  }, [chatTabs, activeChatTabId, dismissBrowserOverlay, handleNewChat, selectedPath, isGraphOpen, isSuggestedTopicsOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isEmailOpen])
+    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
+  }, [chatTabs, activeChatTabId, dismissBrowserOverlay, handleNewChat, selectedPath, isGraphOpen, isSuggestedTopicsOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isEmailOpen, isWorkspaceOpen, isKnowledgeViewOpen])
 
   // Sidebar variant: create/switch chat tab without leaving file/graph context.
   const handleNewChatTabInSidebar = useCallback(() => {
@@ -3135,7 +3245,7 @@ function App() {
 
   const handleOpenFullScreenChat = useCallback(() => {
     // Remember where we came from so the close button can return
-    if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen) {
+    if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen) {
       setExpandedFrom({
         path: selectedPath,
         graph: isGraphOpen,
@@ -3151,19 +3261,19 @@ function App() {
     setSelectedPath(null)
     setIsGraphOpen(false)
     setIsSuggestedTopicsOpen(false)
-    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
-  }, [selectedPath, isGraphOpen, isSuggestedTopicsOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isEmailOpen, dismissBrowserOverlay])
+    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
+  }, [selectedPath, isGraphOpen, isSuggestedTopicsOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isEmailOpen, isWorkspaceOpen, isKnowledgeViewOpen, dismissBrowserOverlay])
 
   const handleCloseFullScreenChat = useCallback(() => {
     if (expandedFrom) {
       if (expandedFrom.graph) {
         setIsGraphOpen(true)
         setIsSuggestedTopicsOpen(false)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
       } else if (expandedFrom.suggestedTopics) {
         setIsGraphOpen(false)
         setIsSuggestedTopicsOpen(true)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
       } else if (expandedFrom.meetings) {
         setIsGraphOpen(false)
         setIsSuggestedTopicsOpen(false)
@@ -3195,7 +3305,7 @@ function App() {
       } else if (expandedFrom.path) {
         setIsGraphOpen(false)
         setIsSuggestedTopicsOpen(false)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         setSelectedPath(expandedFrom.path)
       }
       setExpandedFrom(null)
@@ -3209,10 +3319,12 @@ function App() {
     if (isMeetingsOpen) return { type: 'meetings' }
     if (isLiveNotesOpen) return { type: 'live-notes' }
     if (isSuggestedTopicsOpen) return { type: 'suggested-topics' }
+    if (isWorkspaceOpen) return { type: 'workspace', path: workspaceInitialPath ?? undefined }
+    if (isKnowledgeViewOpen) return { type: 'knowledge-view' }
     if (selectedPath) return { type: 'file', path: selectedPath }
     if (isGraphOpen) return { type: 'graph' }
     return { type: 'chat', runId }
-  }, [selectedBackgroundTask, isEmailOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isSuggestedTopicsOpen, selectedPath, isGraphOpen, runId])
+  }, [selectedBackgroundTask, isEmailOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isSuggestedTopicsOpen, selectedPath, isGraphOpen, isWorkspaceOpen, isKnowledgeViewOpen, workspaceInitialPath, runId])
 
   const appendUnique = useCallback((stack: ViewState[], entry: ViewState) => {
     const last = stack[stack.length - 1]
@@ -3313,6 +3425,28 @@ function App() {
     setActiveFileTabId(id)
   }, [fileTabs])
 
+  const ensureWorkspaceFileTab = useCallback(() => {
+    const existing = fileTabs.find((tab) => isWorkspaceTabPath(tab.path))
+    if (existing) {
+      setActiveFileTabId(existing.id)
+      return
+    }
+    const id = newFileTabId()
+    setFileTabs((prev) => [...prev, { id, path: WORKSPACE_TAB_PATH }])
+    setActiveFileTabId(id)
+  }, [fileTabs])
+
+  const ensureKnowledgeViewFileTab = useCallback(() => {
+    const existing = fileTabs.find((tab) => isKnowledgeViewTabPath(tab.path))
+    if (existing) {
+      setActiveFileTabId(existing.id)
+      return
+    }
+    const id = newFileTabId()
+    setFileTabs((prev) => [...prev, { id, path: KNOWLEDGE_VIEW_TAB_PATH }])
+    setActiveFileTabId(id)
+  }, [fileTabs])
+
   const openEmailView = useCallback(() => {
     setSelectedPath(null)
     setIsGraphOpen(false)
@@ -3321,6 +3455,8 @@ function App() {
     setIsMeetingsOpen(false)
     setIsLiveNotesOpen(false)
     setIsBgTasksOpen(false)
+    setIsWorkspaceOpen(false)
+    setIsKnowledgeViewOpen(false)
     setSelectedBackgroundTask(null)
     setExpandedFrom(null)
     setIsRightPaneMaximized(false)
@@ -3333,7 +3469,7 @@ function App() {
     setIsGraphOpen(false)
     setIsBrowserOpen(false)
     setIsSuggestedTopicsOpen(false)
-    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+    setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
     setSelectedBackgroundTask(null)
     setExpandedFrom(null)
     setIsRightPaneMaximized(false)
@@ -3350,6 +3486,8 @@ function App() {
     setIsLiveNotesOpen(false)
     setIsBgTasksOpen(false)
     setIsEmailOpen(false)
+    setIsWorkspaceOpen(false)
+    setIsKnowledgeViewOpen(false)
     setSelectedBackgroundTask(null)
     setExpandedFrom(null)
     setIsRightPaneMaximized(false)
@@ -3365,7 +3503,7 @@ function App() {
         // visible in the middle pane.
         setIsBrowserOpen(false)
         setIsSuggestedTopicsOpen(false)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         setExpandedFrom(null)
         // Preserve split vs knowledge-max mode when navigating knowledge files.
         // Only exit chat-only maximize, because that would hide the selected file.
@@ -3380,7 +3518,7 @@ function App() {
         setSelectedPath(null)
         setIsBrowserOpen(false)
         setIsSuggestedTopicsOpen(false)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         setExpandedFrom(null)
         setIsGraphOpen(true)
         ensureGraphFileTab()
@@ -3393,7 +3531,7 @@ function App() {
         setIsGraphOpen(false)
         setIsBrowserOpen(false)
         setIsSuggestedTopicsOpen(false)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         setExpandedFrom(null)
         setIsRightPaneMaximized(false)
         setSelectedBackgroundTask(view.name)
@@ -3406,7 +3544,7 @@ function App() {
         setIsRightPaneMaximized(false)
         setSelectedBackgroundTask(null)
         setIsSuggestedTopicsOpen(true)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         ensureSuggestedTopicsFileTab()
         return
       case 'meetings':
@@ -3421,6 +3559,8 @@ function App() {
         setIsLiveNotesOpen(false)
         setIsBgTasksOpen(false)
         setIsEmailOpen(false)
+        setIsWorkspaceOpen(false)
+        setIsKnowledgeViewOpen(false)
         ensureMeetingsFileTab()
         return
       case 'live-notes':
@@ -3434,6 +3574,8 @@ function App() {
         setIsMeetingsOpen(false)
         setIsBgTasksOpen(false)
         setIsEmailOpen(false)
+        setIsWorkspaceOpen(false)
+        setIsKnowledgeViewOpen(false)
         setIsLiveNotesOpen(true)
         ensureLiveNotesFileTab()
         return
@@ -3449,8 +3591,43 @@ function App() {
         setIsLiveNotesOpen(false)
         setIsBgTasksOpen(false)
         setIsEmailOpen(true)
+        setIsWorkspaceOpen(false)
+        setIsKnowledgeViewOpen(false)
         ensureEmailFileTab()
         return
+      case 'workspace':
+        setSelectedPath(null)
+        setIsGraphOpen(false)
+        setIsBrowserOpen(false)
+        setExpandedFrom(null)
+        setIsRightPaneMaximized(false)
+        setSelectedBackgroundTask(null)
+        setIsSuggestedTopicsOpen(false)
+        setIsMeetingsOpen(false)
+        setIsLiveNotesOpen(false)
+        setIsBgTasksOpen(false)
+        setIsEmailOpen(false)
+        setIsWorkspaceOpen(true)
+        setIsKnowledgeViewOpen(false)
+        setWorkspaceInitialPath(view.path ?? null)
+        ensureWorkspaceFileTab()
+        return
+      case 'knowledge-view':
+        setSelectedPath(null)
+        setIsGraphOpen(false)
+        setIsBrowserOpen(false)
+        setExpandedFrom(null)
+        setIsRightPaneMaximized(false)
+        setSelectedBackgroundTask(null)
+        setIsSuggestedTopicsOpen(false)
+        setIsMeetingsOpen(false)
+        setIsLiveNotesOpen(false)
+        setIsBgTasksOpen(false)
+        setIsEmailOpen(false)
+        setIsWorkspaceOpen(false)
+        setIsKnowledgeViewOpen(true)
+        ensureKnowledgeViewFileTab()
+        return
       case 'chat':
         setSelectedPath(null)
         setIsGraphOpen(false)
@@ -3459,7 +3636,7 @@ function App() {
         setIsRightPaneMaximized(false)
         setSelectedBackgroundTask(null)
         setIsSuggestedTopicsOpen(false)
-        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false)
+        setIsMeetingsOpen(false); setIsLiveNotesOpen(false); setIsBgTasksOpen(false); setIsEmailOpen(false); setIsWorkspaceOpen(false); setIsKnowledgeViewOpen(false)
         if (view.runId) {
           await loadRun(view.runId)
         } else {
@@ -3467,7 +3644,7 @@ function App() {
         }
         return
     }
-  }, [ensureEmailFileTab, ensureMeetingsFileTab, ensureLiveNotesFileTab, ensureFileTabForPath, ensureGraphFileTab, ensureSuggestedTopicsFileTab, handleNewChat, isRightPaneMaximized, loadRun])
+  }, [ensureEmailFileTab, ensureMeetingsFileTab, ensureLiveNotesFileTab, ensureFileTabForPath, ensureGraphFileTab, ensureSuggestedTopicsFileTab, ensureWorkspaceFileTab, ensureKnowledgeViewFileTab, handleNewChat, isRightPaneMaximized, loadRun])
 
   const navigateToView = useCallback(async (nextView: ViewState) => {
     const current = currentViewState
@@ -3789,7 +3966,7 @@ function App() {
   }, [])
 
   // Keyboard shortcut: Ctrl+L to toggle main chat view
-  const isFullScreenChat = !selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !selectedBackgroundTask && !isBrowserOpen
+  const isFullScreenChat = !selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !selectedBackgroundTask && !isBrowserOpen
   useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
       if ((e.ctrlKey || e.metaKey) && e.key === 'l') {
@@ -3817,6 +3994,18 @@ function App() {
     return () => document.removeEventListener('keydown', handleKeyDown)
   }, [])
 
+  // Keyboard shortcut: Cmd+N / Ctrl+N opens a new chat tab.
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if ((e.ctrlKey || e.metaKey) && !e.shiftKey && !e.altKey && e.key.toLowerCase() === 'n') {
+        e.preventDefault()
+        handleNewChatTab()
+      }
+    }
+    document.addEventListener('keydown', handleKeyDown)
+    return () => document.removeEventListener('keydown', handleKeyDown)
+  }, [handleNewChatTab])
+
   // Route undo/redo to the active markdown tab only (prevents cross-tab browser undo behavior).
   useEffect(() => {
     const handleHistoryKeyDown = (e: KeyboardEvent) => {
@@ -3862,11 +4051,11 @@ function App() {
     const handleTabKeyDown = (e: KeyboardEvent) => {
       const mod = e.metaKey || e.ctrlKey
       if (!mod) return
-      const rightPaneAvailable = Boolean((selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen) && isChatSidebarOpen)
+      const rightPaneAvailable = Boolean((selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen) && isChatSidebarOpen)
       const targetPane: ShortcutPane = rightPaneAvailable
         ? (isRightPaneMaximized ? 'right' : activeShortcutPane)
         : 'left'
-      const inFileView = targetPane === 'left' && Boolean(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen)
+      const inFileView = targetPane === 'left' && Boolean(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen)
       const selectedKnowledgePath = isGraphOpen
         ? GRAPH_TAB_PATH
         : isSuggestedTopicsOpen
@@ -3879,6 +4068,10 @@ function App() {
             ? BG_TASKS_TAB_PATH
           : isEmailOpen
             ? EMAIL_TAB_PATH
+          : isWorkspaceOpen
+            ? WORKSPACE_TAB_PATH
+          : isKnowledgeViewOpen
+            ? KNOWLEDGE_VIEW_TAB_PATH
           : selectedPath
       const targetFileTabId = activeFileTabId ?? (
         selectedKnowledgePath
@@ -3933,7 +4126,7 @@ function App() {
     }
     document.addEventListener('keydown', handleTabKeyDown)
     return () => document.removeEventListener('keydown', handleTabKeyDown)
-  }, [selectedPath, isGraphOpen, isSuggestedTopicsOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isEmailOpen, isChatSidebarOpen, isRightPaneMaximized, activeShortcutPane, chatTabs, fileTabs, activeChatTabId, activeFileTabId, closeChatTab, closeFileTab, switchChatTab, switchFileTab])
+  }, [selectedPath, isGraphOpen, isSuggestedTopicsOpen, isMeetingsOpen, isLiveNotesOpen, isBgTasksOpen, isEmailOpen, isWorkspaceOpen, isKnowledgeViewOpen, isChatSidebarOpen, isRightPaneMaximized, activeShortcutPane, chatTabs, fileTabs, activeChatTabId, activeFileTabId, closeChatTab, closeFileTab, switchChatTab, switchFileTab])
 
   const toggleExpand = (path: string, kind: 'file' | 'dir') => {
     if (kind === 'file') {
@@ -3958,7 +4151,7 @@ function App() {
           }),
         },
       }))
-      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !selectedBackgroundTask) {
+      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !selectedBackgroundTask) {
         setIsChatSidebarOpen(false)
         setIsRightPaneMaximized(false)
       }
@@ -4084,19 +4277,49 @@ function App() {
     },
     openGraph: () => {
       // From chat-only landing state, open graph directly in full knowledge view.
-      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !selectedBackgroundTask) {
+      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !selectedBackgroundTask) {
         setIsChatSidebarOpen(false)
         setIsRightPaneMaximized(false)
       }
       void navigateToView({ type: 'graph' })
     },
     openBases: () => {
-      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !selectedBackgroundTask) {
+      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !selectedBackgroundTask) {
         setIsChatSidebarOpen(false)
         setIsRightPaneMaximized(false)
       }
       void navigateToView({ type: 'file', path: BASES_DEFAULT_TAB_PATH })
     },
+    openWorkspaceAt: (path?: string) => {
+      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !selectedBackgroundTask) {
+        setIsChatSidebarOpen(false)
+        setIsRightPaneMaximized(false)
+      }
+      void navigateToView({ type: 'workspace', path })
+    },
+    openKnowledgeView: () => {
+      if (!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !selectedBackgroundTask) {
+        setIsChatSidebarOpen(false)
+        setIsRightPaneMaximized(false)
+      }
+      void navigateToView({ type: 'knowledge-view' })
+    },
+    createWorkspace: async (name: string): Promise<string> => {
+      const trimmed = name.trim()
+      if (!trimmed) throw new Error('Name is required')
+      if (trimmed.includes('/')) throw new Error('Name cannot contain "/"')
+      const rootExists = await window.ipc.invoke('workspace:exists', { path: WORKSPACE_ROOT })
+      if (!rootExists.exists) {
+        await window.ipc.invoke('workspace:mkdir', { path: WORKSPACE_ROOT, recursive: true })
+      }
+      const target = `${WORKSPACE_ROOT}/${trimmed}`
+      const exists = await window.ipc.invoke('workspace:exists', { path: target })
+      if (exists.exists) {
+        throw new Error(`A workspace named "${trimmed}" already exists`)
+      }
+      await window.ipc.invoke('workspace:mkdir', { path: target, recursive: true })
+      return target
+    },
     expandAll: () => setExpandedPaths(new Set(collectDirPaths(tree))),
     collapseAll: () => setExpandedPaths(new Set()),
     rename: async (oldPath: string, newName: string, isDir: boolean) => {
@@ -4690,7 +4913,7 @@ function App() {
   const selectedTask = selectedBackgroundTask
     ? backgroundTasks.find(t => t.name === selectedBackgroundTask)
     : null
-  const isRightPaneContext = Boolean(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isBrowserOpen)
+  const isRightPaneContext = Boolean(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen || isBrowserOpen)
   const isRightPaneOnlyMode = isRightPaneContext && isChatSidebarOpen && isRightPaneMaximized
   const shouldCollapseLeftPane = isRightPaneOnlyMode
   const openMarkdownTabs = React.useMemo(() => {
@@ -4707,7 +4930,7 @@ function App() {
   return (
     <TooltipProvider delayDuration={0}>
       <SidebarSectionProvider defaultSection="tasks" onSectionChange={(section) => {
-        if (section === 'knowledge' && !selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen) {
+        if (section === 'knowledge' && !selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen) {
           void navigateToView({ type: 'file', path: BASES_DEFAULT_TAB_PATH })
         }
       }}>
@@ -4721,18 +4944,8 @@ function App() {
             <SidebarContentPanel
               tree={tree}
               selectedPath={selectedPath}
-              expandedPaths={expandedPaths}
               onSelectFile={toggleExpand}
-              onToggleFolder={(path) => {
-                setExpandedPaths((prev) => {
-                  const next = new Set(prev)
-                  if (next.has(path)) next.delete(path)
-                  else next.add(path)
-                  return next
-                })
-              }}
               knowledgeActions={knowledgeActions}
-              onVoiceNoteCreated={handleVoiceNoteCreated}
               runs={runs}
               currentRunId={runId}
               processingRunIds={processingRunIds}
@@ -4740,7 +4953,7 @@ function App() {
                 onNewChat: handleNewChatTab,
                 onSelectRun: (runIdToLoad) => {
                   cancelRecordingIfActive()
-                  if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isBrowserOpen) {
+                  if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen || isBrowserOpen) {
                     setIsChatSidebarOpen(true)
                   }
 
@@ -4751,7 +4964,7 @@ function App() {
                     return
                   }
                   // In two-pane mode (file/graph/browser), keep the middle pane and just swap chat context in the right sidebar.
-                  if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isBrowserOpen) {
+                  if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen || isBrowserOpen) {
                     setChatTabs(prev => prev.map(t => t.id === activeChatTabId ? { ...t, runId: runIdToLoad } : t))
                     loadRun(runIdToLoad)
                     return
@@ -4775,14 +4988,14 @@ function App() {
                       } else {
                         // Only one tab, reset it to new chat
                         setChatTabs([{ id: tabForRun.id, runId: null }])
-                        if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isBrowserOpen) {
+                        if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen || isBrowserOpen) {
                           handleNewChat()
                         } else {
                           void navigateToView({ type: 'chat', runId: null })
                         }
                       }
                     } else if (runId === runIdToDelete) {
-                      if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isBrowserOpen) {
+                      if (selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen || isBrowserOpen) {
                         setChatTabs(prev => prev.map(t => t.id === activeChatTabId ? { ...t, runId: null } : t))
                         handleNewChat()
                       } else {
@@ -4800,8 +5013,6 @@ function App() {
               }}
               backgroundTasks={backgroundTasks}
               selectedBackgroundTask={selectedBackgroundTask}
-              onNewChat={handleNewChatTab}
-              onOpenSearch={() => setIsSearchOpen(true)}
               isSearchOpen={isSearchOpen}
               isBrowserOpen={isBrowserOpen}
               onToggleBrowser={handleToggleBrowser}
@@ -4809,8 +5020,6 @@ function App() {
               onOpenSuggestedTopics={() => void navigateToView({ type: 'suggested-topics' })}
               isMeetingsOpen={isMeetingsOpen}
               onOpenMeetings={openMeetingsView}
-              isLiveNotesOpen={isLiveNotesOpen}
-              onOpenLiveNotes={() => void navigateToView({ type: 'live-notes' })}
               isBgTasksOpen={isBgTasksOpen}
               onOpenBgTasks={openBgTasksView}
               isEmailOpen={isEmailOpen}
@@ -4834,7 +5043,7 @@ function App() {
                 canNavigateForward={canNavigateForward}
                 collapsedLeftPaddingPx={collapsedLeftPaddingPx}
               >
-                {(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen) && fileTabs.length >= 1 ? (
+                {(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen) && fileTabs.length >= 1 ? (
                   <TabBar
                     tabs={fileTabs}
                     activeTabId={activeFileTabId ?? ''}
@@ -4842,7 +5051,7 @@ function App() {
                     getTabId={(t) => t.id}
                     onSwitchTab={switchFileTab}
                     onCloseTab={closeFileTab}
-                    allowSingleTabClose={fileTabs.length === 1 && (isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || (selectedPath != null && isBaseFilePath(selectedPath)))}
+                    allowSingleTabClose={fileTabs.length === 1 && (isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen || (selectedPath != null && isBaseFilePath(selectedPath)))}
                   />
                 ) : (
                   <TabBar
@@ -4895,7 +5104,7 @@ function App() {
                     <TooltipContent side="bottom">Version history</TooltipContent>
                   </Tooltip>
                 )}
-                {!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !selectedTask && !isBrowserOpen && (
+                {!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !selectedTask && !isBrowserOpen && (
                   <Tooltip>
                     <TooltipTrigger asChild>
                       <button
@@ -4910,7 +5119,7 @@ function App() {
                     <TooltipContent side="bottom">New chat tab</TooltipContent>
                   </Tooltip>
                 )}
-                {!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isBrowserOpen && expandedFrom && (
+                {!selectedPath && !isGraphOpen && !isSuggestedTopicsOpen && !isMeetingsOpen && !isLiveNotesOpen && !isBgTasksOpen && !isEmailOpen && !isWorkspaceOpen && !isKnowledgeViewOpen && !isBrowserOpen && expandedFrom && (
                   <Tooltip>
                     <TooltipTrigger asChild>
                       <button
@@ -4925,7 +5134,7 @@ function App() {
                     <TooltipContent side="bottom">Restore two-pane view</TooltipContent>
                   </Tooltip>
                 )}
-                {(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen) && (
+                {(selectedPath || isGraphOpen || isSuggestedTopicsOpen || isMeetingsOpen || isLiveNotesOpen || isBgTasksOpen || isEmailOpen || isWorkspaceOpen || isKnowledgeViewOpen) && (
                   <Tooltip>
                     <TooltipTrigger asChild>
                       <button
@@ -4991,6 +5200,35 @@ function App() {
                 <div className="flex-1 min-h-0 flex flex-col overflow-hidden">
                   <EmailView />
                 </div>
+              ) : isWorkspaceOpen ? (
+                <div className="flex-1 min-h-0 flex flex-col overflow-hidden">
+                  <WorkspaceView
+                    tree={tree}
+                    initialPath={workspaceInitialPath}
+                    onOpenNote={(path) => navigateToFile(path)}
+                    onCreateWorkspace={async (name) => { await knowledgeActions.createWorkspace(name) }}
+                  />
+                </div>
+              ) : isKnowledgeViewOpen ? (
+                <div className="flex-1 min-h-0 flex flex-col overflow-hidden">
+                  <KnowledgeView
+                    tree={tree}
+                    actions={{
+                      createNote: knowledgeActions.createNote,
+                      createFolder: knowledgeActions.createFolder,
+                      rename: knowledgeActions.rename,
+                      remove: knowledgeActions.remove,
+                      copyPath: knowledgeActions.copyPath,
+                      revealInFileManager: knowledgeActions.revealInFileManager,
+                      onOpenInNewTab: knowledgeActions.onOpenInNewTab,
+                    }}
+                    onOpenNote={(path) => navigateToFile(path)}
+                    onOpenGraph={() => knowledgeActions.openGraph()}
+                    onOpenSearch={() => setIsSearchOpen(true)}
+                    onOpenBases={() => knowledgeActions.openBases()}
+                    onVoiceNoteCreated={handleVoiceNoteCreated}
+                  />
+                </div>
               ) : selectedPath && isBaseFilePath(selectedPath) ? (
                 <div className="flex-1 min-h-0 flex flex-col overflow-hidden">
                   <BasesView
@@ -5413,6 +5651,8 @@ function App() {
             {/* Rendered last so its no-drag region paints over the sidebar drag region */}
             <FixedSidebarToggle
               leftInsetPx={isMac ? MACOS_TRAFFIC_LIGHTS_RESERVED_PX : 0}
+              onNewChat={handleNewChatTab}
+              onOpenSearch={() => setIsSearchOpen(true)}
             />
           </SidebarProvider>
         </div>

apps/x/apps/renderer/src/components/chat-input-with-mentions.tsx

@@ -274,9 +274,21 @@ function ChatInputInner({
 
   const handleSetWorkDir = useCallback(async () => {
     try {
+      let defaultPath: string | undefined = workDir ?? undefined
+      try {
+        const { root } = await window.ipc.invoke('workspace:getRoot', null)
+        const workspaceRel = 'knowledge/Workspace'
+        const exists = await window.ipc.invoke('workspace:exists', { path: workspaceRel })
+        if (!exists.exists) {
+          await window.ipc.invoke('workspace:mkdir', { path: workspaceRel, recursive: true })
+        }
+        defaultPath = `${root.replace(/\/$/, '')}/${workspaceRel}`
+      } catch (err) {
+        console.error('Failed to resolve Workspace path; falling back to current workDir', err)
+      }
       const { path: chosen } = await window.ipc.invoke('dialog:openDirectory', {
         title: 'Choose work directory',
-        defaultPath: workDir ?? undefined,
+        defaultPath,
       })
       if (!chosen) return
       await window.ipc.invoke('workspace:writeFile', {

apps/x/apps/renderer/src/components/html-file-viewer.tsx

@@ -1,33 +1,11 @@
-import { useEffect, useState } from 'react'
+import { useEffect, useMemo, useState } from 'react'
 import { AlertCircleIcon, ExternalLinkIcon, FileTextIcon, Loader2Icon } from 'lucide-react'
 
 const MAX_SIZE_BYTES = 5 * 1024 * 1024
-const CACHE_MAX_ENTRIES = 20
-
-type CacheEntry = { html: string; mtimeMs: number; size: number }
-const htmlCache = new Map<string, CacheEntry>()
-
-function getCached(path: string, mtimeMs: number, size: number): string | null {
-  const entry = htmlCache.get(path)
-  if (!entry || entry.mtimeMs !== mtimeMs || entry.size !== size) return null
-  // Refresh LRU position
-  htmlCache.delete(path)
-  htmlCache.set(path, entry)
-  return entry.html
-}
-
-function setCached(path: string, html: string, mtimeMs: number, size: number) {
-  htmlCache.set(path, { html, mtimeMs, size })
-  while (htmlCache.size > CACHE_MAX_ENTRIES) {
-    const oldest = htmlCache.keys().next().value
-    if (oldest === undefined) break
-    htmlCache.delete(oldest)
-  }
-}
 
 type ViewerState =
   | { kind: 'loading' }
-  | { kind: 'loaded'; html: string }
+  | { kind: 'loaded' }
   | { kind: 'empty' }
   | { kind: 'tooLarge'; sizeMB: number }
   | { kind: 'error'; message: string }
@@ -36,9 +14,15 @@ interface HtmlFileViewerProps {
   path: string
 }
 
+function toAppWorkspaceUrl(path: string): string {
+  const segments = path.split('/').filter(Boolean).map((seg) => encodeURIComponent(seg))
+  return `app://workspace/${segments.join('/')}`
+}
+
 export function HtmlFileViewer({ path }: HtmlFileViewerProps) {
   const [state, setState] = useState<ViewerState>({ kind: 'loading' })
   const [iframeLoaded, setIframeLoaded] = useState(false)
+  const iframeSrc = useMemo(() => toAppWorkspaceUrl(path), [path])
 
   useEffect(() => {
     let cancelled = false
@@ -57,19 +41,11 @@ export function HtmlFileViewer({ path }: HtmlFileViewerProps) {
           setState({ kind: 'tooLarge', sizeMB: stat.size / (1024 * 1024) })
           return
         }
-        const cachedHtml = getCached(path, stat.mtimeMs, stat.size)
-        if (cachedHtml !== null) {
-          setState(cachedHtml.trim() === '' ? { kind: 'empty' } : { kind: 'loaded', html: cachedHtml })
-          return
-        }
-        const result = await window.ipc.invoke('workspace:readFile', { path })
-        if (cancelled) return
-        setCached(path, result.data, stat.mtimeMs, stat.size)
-        if (!result.data || result.data.trim() === '') {
+        if (stat.size === 0) {
           setState({ kind: 'empty' })
           return
         }
-        setState({ kind: 'loaded', html: result.data })
+        setState({ kind: 'loaded' })
       } catch (err) {
         if (cancelled) return
         const message = err instanceof Error ? err.message : String(err)
@@ -124,20 +100,16 @@ export function HtmlFileViewer({ path }: HtmlFileViewerProps) {
     )
   }
 
-  // We use `srcDoc` here (not `src=app://workspace/<path>`) so the iframe
-  // gets a null origin with no base URL. Trade-off: relative assets inside
-  // the file — `<link href="./style.css">`, `<img src="./pic.png">`,
-  // `<script src="./foo.js">` — will silently 404. Self-contained HTML
-  // works fine; HTML that ships next to sibling assets will look broken.
-  // TODO: switch to `src=app://workspace/<path>` if we want relative-asset
-  // support; that path also resolves through the existing path-traversal
-  // guard in resolveWorkspacePath.
+  // Serve via the `app://workspace/<rel-path>` protocol so the iframe has a
+  // proper base URL — relative `<link>`, `<img>`, `<script>` references next
+  // to the file resolve correctly (the path-traversal guard in
+  // resolveWorkspacePath already gates the protocol handler).
   return (
     <div className="relative h-full w-full">
       {state.kind === 'loaded' && (
         <iframe
           key={path}
-          srcDoc={state.html}
+          src={iframeSrc}
           sandbox="allow-scripts"
           className="h-full w-full border-0 bg-white"
           title="HTML preview"

apps/x/apps/renderer/src/components/knowledge-view.tsx

@@ -0,0 +1,405 @@
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
+import {
+  ChevronRight,
+  Copy,
+  ExternalLink,
+  File as FileIcon,
+  FilePlus,
+  Folder as FolderIcon,
+  FolderOpen,
+  FolderPlus,
+  Network,
+  Pencil,
+  SearchIcon,
+  Table2,
+  Trash2,
+} from 'lucide-react'
+
+import {
+  ContextMenu,
+  ContextMenuContent,
+  ContextMenuItem,
+  ContextMenuSeparator,
+  ContextMenuTrigger,
+} from '@/components/ui/context-menu'
+import { Input } from '@/components/ui/input'
+import { VoiceNoteButton } from '@/components/sidebar-content'
+import { formatRelativeTime } from '@/lib/relative-time'
+import { toast } from '@/lib/toast'
+import { cn } from '@/lib/utils'
+
+interface TreeNode {
+  path: string
+  name: string
+  kind: 'file' | 'dir'
+  children?: TreeNode[]
+  stat?: { size: number; mtimeMs: number }
+}
+
+export type KnowledgeViewActions = {
+  createNote: (parentPath?: string) => void
+  createFolder: (parentPath?: string) => Promise<string>
+  rename: (path: string, newName: string, isDir: boolean) => Promise<void>
+  remove: (path: string) => Promise<void>
+  copyPath: (path: string) => void
+  revealInFileManager: (path: string, isDir: boolean) => void
+  onOpenInNewTab?: (path: string) => void
+}
+
+type KnowledgeViewProps = {
+  tree: TreeNode[]
+  actions: KnowledgeViewActions
+  onOpenNote: (path: string) => void
+  onOpenGraph: () => void
+  onOpenSearch: () => void
+  onOpenBases: () => void
+  onVoiceNoteCreated?: (path: string) => void
+}
+
+type FlatRow = {
+  node: TreeNode
+  depth: number
+}
+
+function sortNodes(nodes: TreeNode[]): TreeNode[] {
+  return [...nodes].sort((a, b) => {
+    if (a.kind !== b.kind) return a.kind === 'dir' ? -1 : 1
+    return a.name.localeCompare(b.name)
+  })
+}
+
+function flatten(
+  nodes: TreeNode[],
+  expanded: Set<string>,
+  depth: number,
+  out: FlatRow[],
+): void {
+  for (const node of sortNodes(nodes)) {
+    out.push({ node, depth })
+    if (node.kind === 'dir' && expanded.has(node.path) && node.children?.length) {
+      flatten(node.children, expanded, depth + 1, out)
+    }
+  }
+}
+
+function formatModified(mtimeMs?: number): string {
+  if (!mtimeMs) return ''
+  return formatRelativeTime(new Date(mtimeMs).toISOString())
+}
+
+function getFileManagerName(): string {
+  if (typeof navigator === 'undefined') return 'File Manager'
+  const platform = navigator.platform.toLowerCase()
+  if (platform.includes('mac')) return 'Finder'
+  if (platform.includes('win')) return 'Explorer'
+  return 'File Manager'
+}
+
+function displayName(node: TreeNode): string {
+  if (node.kind === 'file' && node.name.toLowerCase().endsWith('.md')) {
+    return node.name.slice(0, -3)
+  }
+  return node.name
+}
+
+const INDENT_PX = 16
+const ROW_PADDING_PX = 12
+
+export function KnowledgeView({
+  tree,
+  actions,
+  onOpenNote,
+  onOpenGraph,
+  onOpenSearch,
+  onOpenBases,
+  onVoiceNoteCreated,
+}: KnowledgeViewProps) {
+  const [expanded, setExpanded] = useState<Set<string>>(new Set())
+  const [renameTarget, setRenameTarget] = useState<string | null>(null)
+
+  const rows = useMemo<FlatRow[]>(() => {
+    const out: FlatRow[] = []
+    flatten(tree, expanded, 0, out)
+    return out
+  }, [tree, expanded])
+
+  const handleRowClick = useCallback(
+    (node: TreeNode) => {
+      if (node.kind === 'dir') {
+        setExpanded((prev) => {
+          const next = new Set(prev)
+          if (next.has(node.path)) next.delete(node.path)
+          else next.add(node.path)
+          return next
+        })
+      } else {
+        onOpenNote(node.path)
+      }
+    },
+    [onOpenNote],
+  )
+
+  return (
+    <div className="flex h-full flex-col overflow-hidden">
+      <div className="shrink-0 flex items-center justify-between gap-3 border-b border-border px-8 py-6">
+        <h1 className="text-2xl font-bold tracking-tight">Knowledge</h1>
+        <div className="flex items-center gap-2">
+          <button
+            type="button"
+            onClick={() => actions.createNote()}
+            className="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-3 py-1.5 text-sm text-foreground transition-colors hover:bg-accent"
+          >
+            <FilePlus className="size-4" />
+            <span>New note</span>
+          </button>
+          <button
+            type="button"
+            onClick={() => void actions.createFolder()}
+            className="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-3 py-1.5 text-sm text-foreground transition-colors hover:bg-accent"
+          >
+            <FolderPlus className="size-4" />
+            <span>New folder</span>
+          </button>
+          <VoiceNoteButton onNoteCreated={onVoiceNoteCreated} />
+          <button
+            type="button"
+            onClick={onOpenSearch}
+            className="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-3 py-1.5 text-sm text-foreground transition-colors hover:bg-accent"
+          >
+            <SearchIcon className="size-4" />
+            <span>Search</span>
+          </button>
+          <button
+            type="button"
+            onClick={onOpenBases}
+            className="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-3 py-1.5 text-sm text-foreground transition-colors hover:bg-accent"
+          >
+            <Table2 className="size-4" />
+            <span>Bases</span>
+          </button>
+          <button
+            type="button"
+            onClick={onOpenGraph}
+            className="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-3 py-1.5 text-sm text-foreground transition-colors hover:bg-accent"
+          >
+            <Network className="size-4" />
+            <span>Graph view</span>
+          </button>
+          <button
+            type="button"
+            onClick={() => actions.revealInFileManager('knowledge', true)}
+            className="inline-flex items-center gap-1.5 rounded-md border border-border bg-background px-3 py-1.5 text-sm text-foreground transition-colors hover:bg-accent"
+          >
+            <FolderOpen className="size-4" />
+            <span>Open in {getFileManagerName()}</span>
+          </button>
+        </div>
+      </div>
+
+      <div className="flex-1 overflow-y-auto">
+        <div className="min-w-[480px]">
+          <div className="sticky top-0 z-10 flex items-center border-b border-border bg-background px-6 py-2 text-xs font-medium text-muted-foreground">
+            <div className="flex-1">Page name</div>
+            <div className="w-32 shrink-0">Modified</div>
+          </div>
+
+          {rows.length === 0 ? (
+            <div className="px-6 py-8 text-sm text-muted-foreground">No pages yet.</div>
+          ) : (
+            rows.map(({ node, depth }) => (
+              <KnowledgeRow
+                key={node.path}
+                node={node}
+                depth={depth}
+                isExpanded={expanded.has(node.path)}
+                actions={actions}
+                renameActive={renameTarget === node.path}
+                onRequestRename={(p) => setRenameTarget(p)}
+                onClearRename={() => setRenameTarget(null)}
+                onClick={handleRowClick}
+              />
+            ))
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function KnowledgeRow({
+  node,
+  depth,
+  isExpanded,
+  actions,
+  renameActive,
+  onRequestRename,
+  onClearRename,
+  onClick,
+}: {
+  node: TreeNode
+  depth: number
+  isExpanded: boolean
+  actions: KnowledgeViewActions
+  renameActive: boolean
+  onRequestRename: (path: string) => void
+  onClearRename: () => void
+  onClick: (node: TreeNode) => void
+}) {
+  const isDir = node.kind === 'dir'
+  const Icon = isDir ? FolderIcon : FileIcon
+  const paddingLeft = ROW_PADDING_PX + depth * INDENT_PX
+  const baseName = displayName(node)
+
+  const [newName, setNewName] = useState(baseName)
+  const inputRef = useRef<HTMLInputElement | null>(null)
+  const isSubmittingRef = useRef(false)
+
+  useEffect(() => {
+    if (renameActive) {
+      setNewName(baseName)
+      isSubmittingRef.current = false
+      // focus on next tick after mount
+      requestAnimationFrame(() => {
+        inputRef.current?.focus()
+        inputRef.current?.select()
+      })
+    }
+  }, [renameActive, baseName])
+
+  const handleRenameSubmit = useCallback(async () => {
+    if (isSubmittingRef.current) return
+    isSubmittingRef.current = true
+    const trimmed = newName.trim()
+    if (trimmed && trimmed !== baseName) {
+      try {
+        await actions.rename(node.path, trimmed, isDir)
+        toast('Renamed successfully', 'success')
+      } catch {
+        toast('Failed to rename', 'error')
+      }
+    }
+    onClearRename()
+    setTimeout(() => {
+      isSubmittingRef.current = false
+    }, 100)
+  }, [actions, baseName, isDir, newName, node.path, onClearRename])
+
+  const cancelRename = useCallback(() => {
+    isSubmittingRef.current = true
+    setNewName(baseName)
+    onClearRename()
+    setTimeout(() => {
+      isSubmittingRef.current = false
+    }, 100)
+  }, [baseName, onClearRename])
+
+  const handleDelete = useCallback(async () => {
+    try {
+      await actions.remove(node.path)
+      toast('Moved to trash', 'success')
+    } catch {
+      toast('Failed to delete', 'error')
+    }
+  }, [actions, node.path])
+
+  const handleCopyPath = useCallback(() => {
+    actions.copyPath(node.path)
+    toast('Path copied', 'success')
+  }, [actions, node.path])
+
+  const row = (
+    <button
+      type="button"
+      onClick={() => onClick(node)}
+      className="group flex w-full items-center border-b border-border/60 px-6 py-1.5 text-left text-sm transition-colors hover:bg-accent"
+    >
+      <div className="flex flex-1 items-center gap-1.5 min-w-0" style={{ paddingLeft }}>
+        <span className="inline-flex w-4 shrink-0 items-center justify-center text-muted-foreground">
+          {isDir ? (
+            <ChevronRight
+              className={cn(
+                'size-3.5 transition-transform',
+                isExpanded && 'rotate-90',
+              )}
+            />
+          ) : null}
+        </span>
+        <Icon className="size-4 shrink-0 text-muted-foreground" />
+        {renameActive ? (
+          <Input
+            ref={inputRef}
+            value={newName}
+            onChange={(e) => setNewName(e.target.value)}
+            onClick={(e) => e.stopPropagation()}
+            onKeyDown={(e) => {
+              e.stopPropagation()
+              if (e.key === 'Enter') {
+                e.preventDefault()
+                void handleRenameSubmit()
+              } else if (e.key === 'Escape') {
+                e.preventDefault()
+                cancelRename()
+              }
+            }}
+            onBlur={() => {
+              if (!isSubmittingRef.current) void handleRenameSubmit()
+            }}
+            className="h-6 text-sm flex-1"
+          />
+        ) : (
+          <span className="min-w-0 truncate">{baseName}</span>
+        )}
+      </div>
+      <div className="w-32 shrink-0 text-xs text-muted-foreground tabular-nums">
+        {formatModified(node.stat?.mtimeMs)}
+      </div>
+    </button>
+  )
+
+  return (
+    <ContextMenu>
+      <ContextMenuTrigger asChild>{row}</ContextMenuTrigger>
+      <ContextMenuContent className="w-48">
+        {isDir && (
+          <>
+            <ContextMenuItem onClick={() => actions.createNote(node.path)}>
+              <FilePlus className="mr-2 size-4" />
+              New Note
+            </ContextMenuItem>
+            <ContextMenuItem onClick={() => void actions.createFolder(node.path)}>
+              <FolderPlus className="mr-2 size-4" />
+              New Folder
+            </ContextMenuItem>
+            <ContextMenuSeparator />
+          </>
+        )}
+        {!isDir && actions.onOpenInNewTab && (
+          <>
+            <ContextMenuItem onClick={() => actions.onOpenInNewTab!(node.path)}>
+              <ExternalLink className="mr-2 size-4" />
+              Open in new tab
+            </ContextMenuItem>
+            <ContextMenuSeparator />
+          </>
+        )}
+        <ContextMenuItem onClick={handleCopyPath}>
+          <Copy className="mr-2 size-4" />
+          Copy Path
+        </ContextMenuItem>
+        <ContextMenuItem onClick={() => actions.revealInFileManager(node.path, isDir)}>
+          <FolderOpen className="mr-2 size-4" />
+          Open in {getFileManagerName()}
+        </ContextMenuItem>
+        <ContextMenuSeparator />
+        <ContextMenuItem onClick={() => onRequestRename(node.path)}>
+          <Pencil className="mr-2 size-4" />
+          Rename
+        </ContextMenuItem>
+        <ContextMenuItem variant="destructive" onClick={handleDelete}>
+          <Trash2 className="mr-2 size-4" />
+          Delete
+        </ContextMenuItem>
+      </ContextMenuContent>
+    </ContextMenu>
+  )
+}

apps/x/apps/renderer/src/components/sidebar-content.tsx

@@ -4,25 +4,17 @@ import * as React from "react"
 import { useCallback, useEffect, useRef, useState } from "react"
 import {
   Bot,
+  ArrowUpRight,
   ChevronRight,
-  ChevronsDownUp,
-  ChevronsUpDown,
-  Copy,
   ExternalLink,
+  FileText,
   FilePlus,
   Folder,
-  FolderOpen,
   FolderPlus,
   Globe,
   AlertTriangle,
   HelpCircle,
   Mic,
-  Network,
-  Pencil,
-  Radio,
-  SearchIcon,
-  SquarePen,
-  Table2,
   Plug,
   Lightbulb,
   ListChecks,
@@ -32,12 +24,6 @@ import {
   Square,
   Trash2,
 } from "lucide-react"
-
-import {
-  Collapsible,
-  CollapsibleContent,
-  CollapsibleTrigger,
-} from "@/components/ui/collapsible"
 import {
   Dialog,
   DialogContent,
@@ -66,10 +52,8 @@ import {
   SidebarGroupContent,
   SidebarHeader,
   SidebarMenu,
-  SidebarMenuAction,
   SidebarMenuButton,
   SidebarMenuItem,
-  SidebarMenuSub,
   SidebarRail,
   useSidebar,
 } from "@/components/ui/sidebar"
@@ -90,9 +74,7 @@ import {
   ContextMenuSeparator,
   ContextMenuTrigger,
 } from "@/components/ui/context-menu"
-import { Input } from "@/components/ui/input"
 import { cn } from "@/lib/utils"
-import { type ActiveSection, useSidebarSection } from "@/contexts/sidebar-context"
 import { ConnectorsPopover } from "@/components/connectors-popover"
 import { HelpPopover } from "@/components/help-popover"
 import { SettingsDialog } from "@/components/settings-dialog"
@@ -108,6 +90,7 @@ interface TreeNode {
   kind: "file" | "dir"
   children?: TreeNode[]
   loaded?: boolean
+  stat?: { size: number; mtimeMs: number }
 }
 
 type KnowledgeActions = {
@@ -115,6 +98,9 @@ type KnowledgeActions = {
   createFolder: (parentPath?: string) => Promise<string>
   openGraph: () => void
   openBases: () => void
+  openKnowledgeView: () => void
+  openWorkspaceAt: (path?: string) => void
+  createWorkspace: (name: string) => Promise<string>
   expandAll: () => void
   collapseAll: () => void
   rename: (path: string, newName: string, isDir: boolean) => Promise<void>
@@ -124,12 +110,11 @@ type KnowledgeActions = {
   onOpenInNewTab?: (path: string) => void
 }
 
-function getFileManagerName(): string {
-  if (typeof navigator === 'undefined') return 'File Manager'
-  const platform = navigator.platform.toLowerCase()
-  if (platform.includes('mac')) return 'Finder'
-  if (platform.includes('win')) return 'Explorer'
-  return 'File Manager'
+function displayNoteName(node: TreeNode): string {
+  if (node.kind === 'file' && node.name.toLowerCase().endsWith('.md')) {
+    return node.name.slice(0, -3)
+  }
+  return node.name
 }
 
 type RunListItem = {
@@ -203,19 +188,14 @@ type TasksActions = {
 type SidebarContentPanelProps = {
   tree: TreeNode[]
   selectedPath: string | null
-  expandedPaths: Set<string>
   onSelectFile: (path: string, kind: "file" | "dir") => void
-  onToggleFolder?: (path: string) => void
   knowledgeActions: KnowledgeActions
-  onVoiceNoteCreated?: (path: string) => void
   runs?: RunListItem[]
   currentRunId?: string | null
   processingRunIds?: Set<string>
   tasksActions?: TasksActions
   backgroundTasks?: BackgroundTaskItem[]
   selectedBackgroundTask?: string | null
-  onNewChat?: () => void
-  onOpenSearch?: () => void
   isSearchOpen?: boolean
   isBrowserOpen?: boolean
   onToggleBrowser?: () => void
@@ -223,19 +203,12 @@ type SidebarContentPanelProps = {
   onOpenSuggestedTopics?: () => void
   isMeetingsOpen?: boolean
   onOpenMeetings?: () => void
-  isLiveNotesOpen?: boolean
-  onOpenLiveNotes?: () => void
   isBgTasksOpen?: boolean
   onOpenBgTasks?: () => void
   isEmailOpen?: boolean
   onOpenEmail?: () => void
 } & React.ComponentProps<typeof Sidebar>
 
-const sectionTabs: { id: ActiveSection; label: string }[] = [
-  { id: "tasks", label: "Chat" },
-  { id: "knowledge", label: "Knowledge" },
-]
-
 function formatEventTime(ts: string): string {
   const date = new Date(ts)
   if (Number.isNaN(date.getTime())) return ""
@@ -464,19 +437,14 @@ function SyncStatusBar() {
 export function SidebarContentPanel({
   tree,
   selectedPath,
-  expandedPaths,
   onSelectFile,
-  onToggleFolder,
   knowledgeActions,
-  onVoiceNoteCreated,
   runs = [],
   currentRunId,
   processingRunIds,
   tasksActions,
   backgroundTasks = [],
   selectedBackgroundTask,
-  onNewChat,
-  onOpenSearch,
   isSearchOpen = false,
   isBrowserOpen = false,
   onToggleBrowser,
@@ -484,15 +452,12 @@ export function SidebarContentPanel({
   onOpenSuggestedTopics,
   isMeetingsOpen = false,
   onOpenMeetings,
-  isLiveNotesOpen = false,
-  onOpenLiveNotes,
   isBgTasksOpen = false,
   onOpenBgTasks,
   isEmailOpen = false,
   onOpenEmail,
   ...props
 }: SidebarContentPanelProps) {
-  const { activeSection, setActiveSection } = useSidebarSection()
   const [hasOauthError, setHasOauthError] = useState(false)
   const [showOauthAlert, setShowOauthAlert] = useState(true)
   const [connectorsOpen, setConnectorsOpen] = useState(false)
@@ -505,7 +470,6 @@ export function SidebarContentPanel({
   const isBrowserQuickActionSelected = isBrowserOpen && !isSearchOpen
   const isSuggestedTopicsQuickActionSelected = isSuggestedTopicsOpen && !isBrowserOpen
   const isMeetingsQuickActionSelected = isMeetingsOpen && !isBrowserOpen
-  const isLiveNotesQuickActionSelected = isLiveNotesOpen && !isBrowserOpen
   const isBgTasksQuickActionSelected = isBgTasksOpen && !isBrowserOpen
   const isEmailQuickActionSelected = isEmailOpen && !isBrowserOpen
 
@@ -570,97 +534,8 @@ export function SidebarContentPanel({
       <SidebarHeader className="titlebar-drag-region">
         {/* Top spacer to clear the traffic lights + fixed toggle row */}
         <div className="h-8" />
-        {/* Tab switcher - centered below the traffic lights row */}
-        <div className="flex items-center px-2 py-1.5">
-          <div className="rowboat-section-switcher titlebar-no-drag flex w-full rounded-lg bg-sidebar-accent/50 p-0.5">
-            {sectionTabs.map((tab) => (
-              <button
-                key={tab.id}
-                onClick={() => setActiveSection(tab.id)}
-                className={cn(
-                  "flex-1 rounded-md px-3 py-1 text-sm font-medium transition-colors",
-                  activeSection === tab.id
-                    ? "bg-sidebar-accent text-sidebar-accent-foreground shadow-sm"
-                    : "text-sidebar-foreground/70 hover:text-sidebar-foreground"
-                )}
-              >
-                {tab.label}
-              </button>
-            ))}
-          </div>
-        </div>
         {/* Quick action buttons */}
         <div className="rowboat-quick-actions titlebar-no-drag flex flex-col gap-0.5 px-2 pb-1">
-          {onNewChat && (
-            <button
-              type="button"
-              onClick={onNewChat}
-              className="flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm text-sidebar-foreground/80 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground transition-colors"
-            >
-              <SquarePen className="size-4" />
-              <span>New chat</span>
-            </button>
-          )}
-          {onOpenSearch && (
-            <button
-              type="button"
-              onClick={onOpenSearch}
-              className={cn(
-                "flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm transition-colors",
-                isSearchOpen
-                  ? "bg-sidebar-accent text-sidebar-accent-foreground"
-                  : "text-sidebar-foreground/80 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground"
-              )}
-            >
-              <SearchIcon className="size-4" />
-              <span>Search</span>
-            </button>
-          )}
-          {onToggleBrowser && (
-            <button
-              type="button"
-              onClick={onToggleBrowser}
-              className={cn(
-                "flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm transition-colors",
-                isBrowserQuickActionSelected
-                  ? "bg-sidebar-accent text-sidebar-accent-foreground"
-                  : "text-sidebar-foreground/80 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground"
-              )}
-            >
-              <Globe className="size-4" />
-              <span>Run browser task</span>
-            </button>
-          )}
-          {onOpenSuggestedTopics && (
-            <button
-              type="button"
-              onClick={onOpenSuggestedTopics}
-              className={cn(
-                "flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm transition-colors",
-                isSuggestedTopicsQuickActionSelected
-                  ? "bg-sidebar-accent text-sidebar-accent-foreground"
-                  : "text-sidebar-foreground/80 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground"
-              )}
-            >
-              <Lightbulb className="size-4" />
-              <span>Suggested Topics</span>
-            </button>
-          )}
-          {onOpenBgTasks && (
-            <button
-              type="button"
-              onClick={onOpenBgTasks}
-              className={cn(
-                "flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm transition-colors",
-                isBgTasksQuickActionSelected
-                  ? "bg-sidebar-accent text-sidebar-accent-foreground"
-                  : "text-sidebar-foreground/80 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground"
-              )}
-            >
-              <ListChecks className="size-4" />
-              <span>Background tasks</span>
-            </button>
-          )}
           {onOpenEmail && (
             <button
               type="button"
@@ -691,45 +566,39 @@ export function SidebarContentPanel({
               <span>Meetings</span>
             </button>
           )}
-          {onOpenLiveNotes && (
+          {onOpenBgTasks && (
             <button
               type="button"
-              onClick={onOpenLiveNotes}
+              onClick={onOpenBgTasks}
               className={cn(
                 "flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-sm transition-colors",
-                isLiveNotesQuickActionSelected
+                isBgTasksQuickActionSelected
                   ? "bg-sidebar-accent text-sidebar-accent-foreground"
                   : "text-sidebar-foreground/80 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground"
               )}
             >
-              <Radio className="size-4" />
-              <span>Live notes</span>
+              <ListChecks className="size-4" />
+              <span>Agents</span>
             </button>
           )}
         </div>
       </SidebarHeader>
       <SidebarContent>
-        {activeSection === "knowledge" && (
-          <KnowledgeSection
-            tree={tree}
-            selectedPath={selectedPath}
-            expandedPaths={expandedPaths}
-            onSelectFile={onSelectFile}
-            onToggleFolder={onToggleFolder}
-            actions={knowledgeActions}
-            onVoiceNoteCreated={onVoiceNoteCreated}
-          />
-        )}
-        {activeSection === "tasks" && (
-          <TasksSection
-            runs={runs}
-            currentRunId={currentRunId}
-            processingRunIds={processingRunIds}
-            actions={tasksActions}
-            backgroundTasks={backgroundTasks}
-            selectedBackgroundTask={selectedBackgroundTask}
-          />
-        )}
+        <KnowledgeSection
+          tree={tree}
+          selectedPath={selectedPath}
+          onSelectFile={onSelectFile}
+          actions={knowledgeActions}
+        />
+        <WorkspaceSection tree={tree} actions={knowledgeActions} />
+        <TasksSection
+          runs={runs}
+          currentRunId={currentRunId}
+          processingRunIds={processingRunIds}
+          actions={tasksActions}
+          backgroundTasks={backgroundTasks}
+          selectedBackgroundTask={selectedBackgroundTask}
+        />
       </SidebarContent>
       {/* Billing / upgrade CTA or Log in CTA */}
       {isRowboatConnected && billing ? (
@@ -769,6 +638,43 @@ export function SidebarContentPanel({
           </button>
         </div>
       )}
+      {/* Secondary quick actions (above bottom divider) */}
+      {(onToggleBrowser || onOpenSuggestedTopics) && (
+        <div className="px-2 pb-1">
+          <div className="flex flex-col gap-0.5">
+            {onToggleBrowser && (
+              <button
+                type="button"
+                onClick={onToggleBrowser}
+                className={cn(
+                  "flex w-full items-center gap-2 rounded-md px-2 py-1 text-xs transition-colors",
+                  isBrowserQuickActionSelected
+                    ? "bg-sidebar-accent text-sidebar-accent-foreground"
+                    : "text-sidebar-foreground/70 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground"
+                )}
+              >
+                <Globe className="size-4" />
+                <span>Run browser task</span>
+              </button>
+            )}
+            {onOpenSuggestedTopics && (
+              <button
+                type="button"
+                onClick={onOpenSuggestedTopics}
+                className={cn(
+                  "flex w-full items-center gap-2 rounded-md px-2 py-1 text-xs transition-colors",
+                  isSuggestedTopicsQuickActionSelected
+                    ? "bg-sidebar-accent text-sidebar-accent-foreground"
+                    : "text-sidebar-foreground/70 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground"
+                )}
+              >
+                <Lightbulb className="size-4" />
+                <span>Suggested Topics</span>
+              </button>
+            )}
+          </div>
+        </div>
+      )}
       {/* Bottom actions */}
       <div className="border-t border-sidebar-border px-2 py-2">
         <div className="flex flex-col gap-1">
@@ -886,7 +792,7 @@ async function transcribeWithDeepgram(audioBlob: Blob): Promise<string | null> {
 }
 
 // Voice Note Recording Button
-function VoiceNoteButton({ onNoteCreated }: { onNoteCreated?: (path: string) => void }) {
+export function VoiceNoteButton({ onNoteCreated }: { onNoteCreated?: (path: string) => void }) {
   const [isRecording, setIsRecording] = React.useState(false)
   const [hasDeepgramKey, setHasDeepgramKey] = React.useState(false)
   const mediaRecorderRef = React.useRef<MediaRecorder | null>(null)
@@ -1102,163 +1008,69 @@ path: ${currentRelativePath}
 function KnowledgeSection({
   tree,
   selectedPath,
-  expandedPaths,
   onSelectFile,
-  onToggleFolder,
   actions,
-  onVoiceNoteCreated,
 }: {
   tree: TreeNode[]
   selectedPath: string | null
-  expandedPaths: Set<string>
   onSelectFile: (path: string, kind: "file" | "dir") => void
-  onToggleFolder?: (path: string) => void
   actions: KnowledgeActions
-  onVoiceNoteCreated?: (path: string) => void
 }) {
-  const isExpanded = expandedPaths.size > 0
-  const treeContainerRef = React.useRef<HTMLDivElement | null>(null)
-  const [selectedFolderPath, setSelectedFolderPath] = useState<string | null>(null)
-  const [renameTarget, setRenameTarget] = useState<string | null>(null)
   const visibleTree = React.useMemo(
-    () => tree.filter((item) => item.path !== 'knowledge/Meetings'),
+    () => tree.filter((item) => item.path !== 'knowledge/Meetings' && item.path !== 'knowledge/Workspace'),
     [tree],
   )
-
-  useEffect(() => {
-    if (!selectedPath) return
-
-    let cancelled = false
-    let rafId: number | null = null
-    let attempts = 0
-    const maxAttempts = 20
-
-    const revealActiveFile = () => {
-      if (cancelled) return
-      const container = treeContainerRef.current
-      if (!container) return
-      const activeRow = container.querySelector<HTMLElement>('[data-knowledge-active="true"]')
-      if (activeRow) {
-        activeRow.scrollIntoView({ block: "nearest", inline: "nearest" })
-        return
+  const recentNotes = React.useMemo<TreeNode[]>(() => {
+    const out: TreeNode[] = []
+    const walk = (nodes: TreeNode[]) => {
+      for (const n of nodes) {
+        if (n.kind === 'file') out.push(n)
+        else if (n.children?.length) walk(n.children)
       }
-      if (attempts >= maxAttempts) return
-      attempts += 1
-      rafId = requestAnimationFrame(revealActiveFile)
     }
-
-    rafId = requestAnimationFrame(revealActiveFile)
-    return () => {
-      cancelled = true
-      if (rafId !== null) cancelAnimationFrame(rafId)
-    }
-  }, [selectedPath, expandedPaths, visibleTree])
-
-  // Folder clicks highlight the folder; file clicks clear folder highlight
-  const handleSelect = React.useCallback((path: string, kind: "file" | "dir") => {
-    if (kind === 'dir') {
-      setSelectedFolderPath(path)
-    } else {
-      setSelectedFolderPath(null)
-    }
-    onSelectFile(path, kind)
-  }, [onSelectFile])
-
-  // Resolve the parent path for new items: explicit folder > open file's parent > root
-  const deriveParent = React.useCallback((): string => {
-    if (selectedFolderPath) return selectedFolderPath
-    if (selectedPath) {
-      const parts = selectedPath.split('/')
-      if (parts.length > 1) return parts.slice(0, -1).join('/')
-    }
-    return 'knowledge'
-  }, [selectedFolderPath, selectedPath])
-
-  // Wrap actions to inject context-aware parent and capture rename target
-  const wrappedActions = React.useMemo<KnowledgeActions>(() => ({
-    ...actions,
-    createNote: (parentPath?: string) => actions.createNote(parentPath ?? deriveParent()),
-    createFolder: async (parentPath?: string): Promise<string> => {
-      const newPath = await actions.createFolder(parentPath ?? deriveParent())
-      setRenameTarget(newPath)
-      return newPath
-    },
-  }), [actions, deriveParent])
-
-  const fileManagerName = getFileManagerName()
-  const quickActions = [
-    { icon: FilePlus, label: "New Note", action: () => wrappedActions.createNote() },
-    { icon: FolderPlus, label: "New Folder", action: () => void wrappedActions.createFolder() },
-    { icon: Network, label: "Graph View", action: () => actions.openGraph() },
-    { icon: Table2, label: "Bases", action: () => actions.openBases() },
-    { icon: FolderOpen, label: `Open in ${fileManagerName}`, action: () => actions.revealInFileManager('knowledge', true) },
-  ]
+    walk(visibleTree)
+    return out
+      .filter((n) => n.stat?.mtimeMs !== undefined)
+      .sort((a, b) => (b.stat?.mtimeMs ?? 0) - (a.stat?.mtimeMs ?? 0))
+      .slice(0, 3)
+  }, [visibleTree])
 
   return (
     <ContextMenu>
       <ContextMenuTrigger asChild>
-        <SidebarGroup className="flex-1 flex flex-col overflow-hidden">
-          <div className="flex items-center justify-center gap-1 py-1 sticky top-0 z-10 bg-sidebar border-b border-sidebar-border">
-            {quickActions.map((action) => (
-              <Tooltip key={action.label}>
-                <TooltipTrigger asChild>
-                  <button
-                    onClick={action.action}
-                    className="text-sidebar-foreground/70 hover:text-sidebar-foreground hover:bg-sidebar-accent rounded p-1.5 transition-colors"
-                  >
-                    <action.icon className="size-4" />
-                  </button>
-                </TooltipTrigger>
-                <TooltipContent side="bottom">{action.label}</TooltipContent>
-              </Tooltip>
-            ))}
-            <VoiceNoteButton onNoteCreated={onVoiceNoteCreated} />
-            <Tooltip>
-              <TooltipTrigger asChild>
-                <button
-                  onClick={isExpanded ? actions.collapseAll : actions.expandAll}
-                  className="text-sidebar-foreground/70 hover:text-sidebar-foreground hover:bg-sidebar-accent rounded p-1.5 transition-colors"
-                >
-                  {isExpanded ? (
-                    <ChevronsDownUp className="size-4" />
-                  ) : (
-                    <ChevronsUpDown className="size-4" />
-                  )}
-                </button>
-              </TooltipTrigger>
-              <TooltipContent side="bottom">
-                {isExpanded ? "Collapse All" : "Expand All"}
-              </TooltipContent>
-            </Tooltip>
+        <SidebarGroup className="flex flex-col">
+          <div className="px-3 py-1.5 text-xs font-medium text-muted-foreground">
+            Knowledge
           </div>
-          <SidebarGroupContent className="flex-1 overflow-y-auto">
-            <div ref={treeContainerRef}>
-              <SidebarMenu>
-                {visibleTree.map((item, index) => (
-                  <Tree
-                    key={index}
-                    item={item}
-                    selectedPath={selectedPath}
-                    expandedPaths={expandedPaths}
-                    onSelect={handleSelect}
-                    onToggleFolder={onToggleFolder}
-                    actions={wrappedActions}
-                    selectedFolderPath={selectedFolderPath}
-                    renameTarget={renameTarget}
-                    onRenameTargetConsumed={() => setRenameTarget(null)}
-                  />
-                ))}
-              </SidebarMenu>
-            </div>
+          <SidebarGroupContent>
+            <SidebarMenu>
+              {recentNotes.map((note) => (
+                <SidebarMenuItem key={note.path}>
+                  <SidebarMenuButton
+                    isActive={selectedPath === note.path}
+                    onClick={() => onSelectFile(note.path, 'file')}
+                  >
+                    <FileText className="size-4 shrink-0" />
+                    <span className="truncate">{displayNoteName(note)}</span>
+                  </SidebarMenuButton>
+                </SidebarMenuItem>
+              ))}
+              <SidebarMenuItem>
+                <SidebarMenuButton onClick={() => actions.openKnowledgeView()}>
+                  <ArrowUpRight className="size-4 shrink-0 text-muted-foreground" />
+                  <span className="text-muted-foreground">View all</span>
+                </SidebarMenuButton>
+              </SidebarMenuItem>
+            </SidebarMenu>
           </SidebarGroupContent>
         </SidebarGroup>
       </ContextMenuTrigger>
       <ContextMenuContent className="w-48">
-        <ContextMenuItem onClick={() => wrappedActions.createNote()}>
+        <ContextMenuItem onClick={() => actions.createNote()}>
           <FilePlus className="mr-2 size-4" />
           New Note
         </ContextMenuItem>
-        <ContextMenuItem onClick={() => void wrappedActions.createFolder()}>
+        <ContextMenuItem onClick={() => void actions.createFolder()}>
           <FolderPlus className="mr-2 size-4" />
           New Folder
         </ContextMenuItem>
@@ -1267,318 +1079,50 @@ function KnowledgeSection({
   )
 }
 
-function countFiles(node: TreeNode): number {
-  if (node.kind === 'file') return 1
-  return (node.children ?? []).reduce((sum, child) => sum + countFiles(child), 0)
-}
-
-/** Display name overrides for top-level knowledge folders */
-const FOLDER_DISPLAY_NAMES: Record<string, string> = {}
-
-// Tree component for file browser
-function Tree({
-  item,
-  selectedPath,
-  expandedPaths,
-  onSelect,
-  onToggleFolder,
+export function WorkspaceSection({
+  tree,
   actions,
-  selectedFolderPath,
-  renameTarget,
-  onRenameTargetConsumed,
 }: {
-  item: TreeNode
-  selectedPath: string | null
-  expandedPaths: Set<string>
-  onSelect: (path: string, kind: "file" | "dir") => void
-  onToggleFolder?: (path: string) => void
+  tree: TreeNode[]
   actions: KnowledgeActions
-  selectedFolderPath?: string | null
-  renameTarget?: string | null
-  onRenameTargetConsumed?: () => void
 }) {
-  const isDir = item.kind === 'dir'
-  const isExpanded = expandedPaths.has(item.path)
-  const isSelected = selectedPath === item.path
-  const isFolderSelected = isDir && selectedFolderPath === item.path
-  const [isRenaming, setIsRenaming] = useState(false)
-  const isSubmittingRef = React.useRef(false)
-  const displayName = (isDir && FOLDER_DISPLAY_NAMES[item.name]) || item.name
-
-  // For files, strip .md extension for editing
-  const baseName = !isDir && item.name.endsWith('.md')
-    ? item.name.slice(0, -3)
-    : item.name
-  const [newName, setNewName] = useState(baseName)
-
-  // Auto-enter rename mode when this node is the rename target
-  React.useEffect(() => {
-    if (renameTarget === item.path) {
-      setNewName(baseName)
-      isSubmittingRef.current = false
-      setIsRenaming(true)
-      onRenameTargetConsumed?.()
-    }
-  // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [renameTarget, item.path])
-
-  // Sync newName when baseName changes (e.g., after external rename)
-  React.useEffect(() => {
-    setNewName(baseName)
-  }, [baseName])
-
-  const handleRename = async () => {
-    // Prevent double submission
-    if (isSubmittingRef.current) return
-    isSubmittingRef.current = true
-
-    const trimmedName = newName.trim()
-    if (trimmedName && trimmedName !== baseName) {
-      try {
-        await actions.rename(item.path, trimmedName, isDir)
-        toast('Renamed successfully', 'success')
-      } catch {
-        toast('Failed to rename', 'error')
-      }
-    }
-    setIsRenaming(false)
-    // Reset after a small delay to prevent blur from re-triggering
-    setTimeout(() => {
-      isSubmittingRef.current = false
-    }, 100)
-  }
-
-  const handleDelete = async () => {
-    try {
-      await actions.remove(item.path)
-      toast('Moved to trash', 'success')
-    } catch {
-      toast('Failed to delete', 'error')
-    }
-  }
-
-  const handleCopyPath = () => {
-    actions.copyPath(item.path)
-    toast('Path copied', 'success')
-  }
-
-  const cancelRename = () => {
-    isSubmittingRef.current = true // Prevent blur from triggering rename
-    setIsRenaming(false)
-    setNewName(baseName) // Reset to original name
-    setTimeout(() => {
-      isSubmittingRef.current = false
-    }, 100)
-  }
-
-  const contextMenuContent = (
-    <ContextMenuContent className="w-48">
-      {isDir && (
-        <>
-          <ContextMenuItem onClick={() => actions.createNote(item.path)}>
-            <FilePlus className="mr-2 size-4" />
-            New Note
-          </ContextMenuItem>
-          <ContextMenuItem onClick={() => actions.createFolder(item.path)}>
-            <FolderPlus className="mr-2 size-4" />
-            New Folder
-          </ContextMenuItem>
-          <ContextMenuSeparator />
-        </>
-      )}
-      {!isDir && actions.onOpenInNewTab && (
-        <>
-          <ContextMenuItem onClick={() => actions.onOpenInNewTab!(item.path)}>
-            <ExternalLink className="mr-2 size-4" />
-            Open in new tab
-          </ContextMenuItem>
-          <ContextMenuSeparator />
-        </>
-      )}
-      <ContextMenuItem onClick={handleCopyPath}>
-        <Copy className="mr-2 size-4" />
-        Copy Path
-      </ContextMenuItem>
-      <ContextMenuItem onClick={() => actions.revealInFileManager(item.path, isDir)}>
-        <FolderOpen className="mr-2 size-4" />
-        Open in {getFileManagerName()}
-      </ContextMenuItem>
-      <ContextMenuSeparator />
-      <ContextMenuItem onClick={() => { setNewName(baseName); isSubmittingRef.current = false; setIsRenaming(true) }}>
-        <Pencil className="mr-2 size-4" />
-        Rename
-      </ContextMenuItem>
-      <ContextMenuItem variant="destructive" onClick={handleDelete}>
-        <Trash2 className="mr-2 size-4" />
-        Delete
-      </ContextMenuItem>
-    </ContextMenuContent>
-  )
-
-  // Inline rename input
-  if (isRenaming) {
-    return (
-      <SidebarMenuItem>
-        <div className="flex items-center px-2 py-1">
-          <Input
-            value={newName}
-            onChange={(e) => setNewName(e.target.value)}
-            onKeyDown={async (e) => {
-              e.stopPropagation()
-              if (e.key === 'Enter') {
-                e.preventDefault()
-                await handleRename()
-              } else if (e.key === 'Escape') {
-                e.preventDefault()
-                cancelRename()
-              }
-            }}
-            onBlur={() => {
-              // Only trigger rename if not already submitting
-              if (!isSubmittingRef.current) {
-                handleRename()
-              }
-            }}
-            className="h-6 text-sm flex-1"
-            autoFocus
-          />
-        </div>
-      </SidebarMenuItem>
-    )
-  }
-
-  // Top-level knowledge folders open bases view — render as flat items
-  const parts = item.path.split('/')
-  const isBasesFolder = isDir && parts.length === 2 && parts[0] === 'knowledge'
-
-  if (isBasesFolder) {
-    return (
-      <ContextMenu>
-        <ContextMenuTrigger asChild>
-          <SidebarMenuItem className="group/file-item">
-            <SidebarMenuButton isActive={isFolderSelected} onClick={() => onSelect(item.path, item.kind)}>
-              <Folder className="size-4 shrink-0" />
-              <div className="flex w-full items-center gap-1 min-w-0">
-                <span className="min-w-0 flex-1 truncate">{displayName}</span>
-                <span className="text-xs text-sidebar-foreground/50 tabular-nums shrink-0">{countFiles(item)}</span>
-              </div>
-            </SidebarMenuButton>
-            {onToggleFolder && (item.children?.length ?? 0) > 0 && (
-              <SidebarMenuAction
-                showOnHover
-                aria-label={isExpanded ? "Collapse folder" : "Expand folder"}
-                onClick={(e) => {
-                  e.stopPropagation()
-                  onToggleFolder(item.path)
-                }}
-              >
-                <ChevronRight
-                  className={cn(
-                    "transition-transform",
-                    isExpanded && "rotate-90",
-                  )}
-                />
-              </SidebarMenuAction>
-            )}
-            {isExpanded && (
-              <SidebarMenuSub>
-                {(item.children ?? []).map((subItem, index) => (
-                  <Tree
-                    key={index}
-                    item={subItem}
-                    selectedPath={selectedPath}
-                    expandedPaths={expandedPaths}
-                    onSelect={onSelect}
-                    onToggleFolder={onToggleFolder}
-                    actions={actions}
-                    selectedFolderPath={selectedFolderPath}
-                    renameTarget={renameTarget}
-                    onRenameTargetConsumed={onRenameTargetConsumed}
-                  />
-                ))}
-              </SidebarMenuSub>
-            )}
-          </SidebarMenuItem>
-        </ContextMenuTrigger>
-        {contextMenuContent}
-      </ContextMenu>
-    )
-  }
-
-  if (!isDir) {
-    return (
-      <ContextMenu>
-        <ContextMenuTrigger asChild>
-          <SidebarMenuItem
-            className="group/file-item"
-            data-knowledge-file-path={item.path}
-            data-knowledge-active={isSelected ? "true" : "false"}
-          >
-            <SidebarMenuButton
-              isActive={isSelected}
-              onClick={(e) => {
-                if (e.metaKey && actions.onOpenInNewTab) {
-                  actions.onOpenInNewTab(item.path)
-                } else {
-                  onSelect(item.path, item.kind)
-                }
-              }}
-            >
-              <div className="flex w-full items-center gap-1 min-w-0">
-                <span className="min-w-0 flex-1 truncate">{item.name}</span>
-              </div>
-            </SidebarMenuButton>
-          </SidebarMenuItem>
-        </ContextMenuTrigger>
-        {contextMenuContent}
-      </ContextMenu>
-    )
-  }
+  const recentWorkspaces = React.useMemo<TreeNode[]>(() => {
+    const root = tree.find((item) => item.path === 'knowledge/Workspace')
+    const children = root?.children ?? []
+    return [...children]
+      .filter((c) => c.kind === 'dir')
+      .sort((a, b) => (b.stat?.mtimeMs ?? 0) - (a.stat?.mtimeMs ?? 0))
+      .slice(0, 3)
+  }, [tree])
 
   return (
-    <ContextMenu>
-      <ContextMenuTrigger asChild>
-        <SidebarMenuItem>
-          <Collapsible
-            open={isExpanded}
-            onOpenChange={() => onSelect(item.path, item.kind)}
-            className="group/collapsible [&[data-state=open]>button>svg:first-child]:rotate-90"
-          >
-            <CollapsibleTrigger asChild>
-              <SidebarMenuButton isActive={isFolderSelected}>
-                <ChevronRight className="transition-transform size-4" />
-                <div className="flex w-full items-center gap-1 min-w-0">
-                  <span className="min-w-0 flex-1 truncate">{displayName}</span>
-                  <span className="text-xs text-sidebar-foreground/50 tabular-nums shrink-0">{countFiles(item)}</span>
-                </div>
+    <SidebarGroup className="flex flex-col">
+      <div className="px-3 py-1.5 text-xs font-medium text-muted-foreground">
+        Workspace
+      </div>
+      <SidebarGroupContent>
+        <SidebarMenu>
+          {recentWorkspaces.map((ws) => (
+            <SidebarMenuItem key={ws.path}>
+              <SidebarMenuButton onClick={() => actions.openWorkspaceAt(ws.path)}>
+                <Folder className="size-4 shrink-0" />
+                <span className="truncate">{ws.name}</span>
               </SidebarMenuButton>
-            </CollapsibleTrigger>
-            <CollapsibleContent>
-              <SidebarMenuSub>
-                {(item.children ?? []).map((subItem, index) => (
-                  <Tree
-                    key={index}
-                    item={subItem}
-                    selectedPath={selectedPath}
-                    expandedPaths={expandedPaths}
-                    onSelect={onSelect}
-                    onToggleFolder={onToggleFolder}
-                    actions={actions}
-                    selectedFolderPath={selectedFolderPath}
-                    renameTarget={renameTarget}
-                    onRenameTargetConsumed={onRenameTargetConsumed}
-                  />
-                ))}
-              </SidebarMenuSub>
-            </CollapsibleContent>
-          </Collapsible>
-        </SidebarMenuItem>
-      </ContextMenuTrigger>
-      {contextMenuContent}
-    </ContextMenu>
+            </SidebarMenuItem>
+          ))}
+          <SidebarMenuItem>
+            <SidebarMenuButton onClick={() => actions.openWorkspaceAt()}>
+              <ArrowUpRight className="size-4 shrink-0 text-muted-foreground" />
+              <span className="text-muted-foreground">View all</span>
+            </SidebarMenuButton>
+          </SidebarMenuItem>
+        </SidebarMenu>
+      </SidebarGroupContent>
+    </SidebarGroup>
   )
 }
 
+
 // Get status indicator color
 function getStatusColor(status?: string, enabled?: boolean): string {
   // Disabled agents always show gray
@@ -1619,8 +1163,8 @@ function TasksSection({
   const [pendingDeleteRunId, setPendingDeleteRunId] = useState<string | null>(null)
 
   return (
-    <SidebarGroup className="flex-1 flex flex-col overflow-hidden">
-      <SidebarGroupContent className="flex-1 overflow-y-auto">
+    <SidebarGroup className="flex flex-col">
+      <SidebarGroupContent>
         {/* Background Tasks Section */}
         {backgroundTasks.length > 0 && (
           <>

apps/x/apps/renderer/src/components/workspace-view.tsx

@@ -0,0 +1,262 @@
+import { useCallback, useEffect, useMemo, useState } from 'react'
+import { ChevronRight, File as FileIcon, Folder as FolderIcon, Home, Plus } from 'lucide-react'
+
+import { Button } from '@/components/ui/button'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog'
+import { Input } from '@/components/ui/input'
+import { cn } from '@/lib/utils'
+
+const WORKSPACE_ROOT = 'knowledge/Workspace'
+
+interface TreeNode {
+  path: string
+  name: string
+  kind: 'file' | 'dir'
+  children?: TreeNode[]
+}
+
+type WorkspaceViewProps = {
+  tree: TreeNode[]
+  initialPath?: string | null
+  onOpenNote: (path: string) => void
+  onCreateWorkspace: (name: string) => Promise<void>
+}
+
+function findNode(nodes: TreeNode[] | undefined, path: string): TreeNode | null {
+  if (!nodes) return null
+  for (const node of nodes) {
+    if (node.path === path) return node
+    if (node.kind === 'dir' && path.startsWith(`${node.path}/`)) {
+      const found = findNode(node.children, path)
+      if (found) return found
+    }
+  }
+  return null
+}
+
+function countChildren(node: TreeNode | null): number {
+  if (!node || node.kind !== 'dir' || !node.children) return 0
+  return node.children.length
+}
+
+export function WorkspaceView({ tree, initialPath, onOpenNote, onCreateWorkspace }: WorkspaceViewProps) {
+  const [currentPath, setCurrentPath] = useState<string>(initialPath || WORKSPACE_ROOT)
+  const [addOpen, setAddOpen] = useState(false)
+  const [newName, setNewName] = useState('')
+  const [creating, setCreating] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  useEffect(() => {
+    if (initialPath) setCurrentPath(initialPath)
+  }, [initialPath])
+
+  const isRoot = currentPath === WORKSPACE_ROOT
+
+  const currentNode = useMemo(() => findNode(tree, currentPath), [tree, currentPath])
+
+  const items = useMemo<TreeNode[]>(() => {
+    const children = currentNode?.children ?? []
+    const filtered = isRoot ? children.filter((c) => c.kind === 'dir') : children
+    return [...filtered].sort((a, b) => {
+      if (a.kind !== b.kind) return a.kind === 'dir' ? -1 : 1
+      return a.name.localeCompare(b.name)
+    })
+  }, [currentNode, isRoot])
+
+  const breadcrumbs = useMemo(() => {
+    if (isRoot) return [] as { path: string; name: string }[]
+    const rel = currentPath.slice(WORKSPACE_ROOT.length + 1)
+    const parts = rel.split('/').filter(Boolean)
+    let acc = WORKSPACE_ROOT
+    return parts.map((seg) => {
+      acc = `${acc}/${seg}`
+      return { path: acc, name: seg }
+    })
+  }, [currentPath, isRoot])
+
+  const handleItemClick = useCallback(
+    (item: TreeNode) => {
+      if (item.kind === 'dir') {
+        setCurrentPath(item.path)
+      } else {
+        onOpenNote(item.path)
+      }
+    },
+    [onOpenNote],
+  )
+
+  const resetAddDialog = useCallback(() => {
+    setNewName('')
+    setError(null)
+    setCreating(false)
+  }, [])
+
+  const handleCreate = useCallback(async () => {
+    const trimmed = newName.trim()
+    if (!trimmed) {
+      setError('Name is required')
+      return
+    }
+    if (trimmed.includes('/')) {
+      setError('Name cannot contain "/"')
+      return
+    }
+    setCreating(true)
+    setError(null)
+    try {
+      await onCreateWorkspace(trimmed)
+      setAddOpen(false)
+      resetAddDialog()
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to create workspace')
+      setCreating(false)
+    }
+  }, [newName, onCreateWorkspace, resetAddDialog])
+
+  return (
+    <div className="flex h-full flex-col overflow-hidden">
+      <div className="flex shrink-0 items-center justify-between gap-3 border-b border-border px-6 py-4">
+        <div className="flex min-w-0 items-center gap-1 text-sm">
+          <button
+            type="button"
+            onClick={() => setCurrentPath(WORKSPACE_ROOT)}
+            className={cn(
+              'inline-flex items-center gap-1.5 rounded-md px-2 py-1 transition-colors',
+              isRoot ? 'text-foreground' : 'text-muted-foreground hover:text-foreground hover:bg-accent',
+            )}
+          >
+            <Home className="size-4" />
+            <span className="font-medium">Workspace</span>
+          </button>
+          {breadcrumbs.map((crumb, idx) => {
+            const isLast = idx === breadcrumbs.length - 1
+            return (
+              <span key={crumb.path} className="flex items-center gap-1">
+                <ChevronRight className="size-4 text-muted-foreground/60" />
+                {isLast ? (
+                  <span className="rounded-md px-2 py-1 font-medium text-foreground truncate">
+                    {crumb.name}
+                  </span>
+                ) : (
+                  <button
+                    type="button"
+                    onClick={() => setCurrentPath(crumb.path)}
+                    className="rounded-md px-2 py-1 text-muted-foreground transition-colors hover:bg-accent hover:text-foreground truncate"
+                  >
+                    {crumb.name}
+                  </button>
+                )}
+              </span>
+            )
+          })}
+        </div>
+        {isRoot && (
+          <Button size="sm" onClick={() => setAddOpen(true)}>
+            <Plus className="size-4" />
+            Add workspace
+          </Button>
+        )}
+      </div>
+
+      <div className="flex-1 overflow-y-auto px-6 py-6">
+        {items.length === 0 ? (
+          <div className="flex h-full flex-col items-center justify-center gap-3 text-center text-muted-foreground">
+            <FolderIcon className="size-10 opacity-50" />
+            <div className="text-sm">
+              {isRoot
+                ? 'No workspaces yet. Create one to get started.'
+                : 'This folder is empty.'}
+            </div>
+            {isRoot && (
+              <Button size="sm" variant="outline" onClick={() => setAddOpen(true)}>
+                <Plus className="size-4" />
+                Add workspace
+              </Button>
+            )}
+          </div>
+        ) : (
+          <div className="grid grid-cols-[repeat(auto-fill,minmax(180px,1fr))] gap-3">
+            {items.map((item) => {
+              const childCount = item.kind === 'dir' ? countChildren(item) : 0
+              const Icon = item.kind === 'dir' ? FolderIcon : FileIcon
+              return (
+                <button
+                  key={item.path}
+                  type="button"
+                  onClick={() => handleItemClick(item)}
+                  className="group flex flex-col items-start gap-2 rounded-lg border border-border bg-card p-4 text-left transition-colors hover:border-foreground/20 hover:bg-accent"
+                >
+                  <Icon className="size-6 text-muted-foreground group-hover:text-foreground" />
+                  <div className="min-w-0 w-full">
+                    <div className="truncate text-sm font-medium">{item.name}</div>
+                    {item.kind === 'dir' && (
+                      <div className="text-xs text-muted-foreground">
+                        {childCount} {childCount === 1 ? 'item' : 'items'}
+                      </div>
+                    )}
+                  </div>
+                </button>
+              )
+            })}
+          </div>
+        )}
+      </div>
+
+      <Dialog
+        open={addOpen}
+        onOpenChange={(open) => {
+          setAddOpen(open)
+          if (!open) resetAddDialog()
+        }}
+      >
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>New workspace</DialogTitle>
+            <DialogDescription>
+              Workspaces are top-level folders inside knowledge/Workspace.
+            </DialogDescription>
+          </DialogHeader>
+          <div className="grid gap-2">
+            <label htmlFor="workspace-name" className="text-sm font-medium">Name</label>
+            <Input
+              id="workspace-name"
+              value={newName}
+              onChange={(e) => setNewName(e.target.value)}
+              placeholder="e.g. Alpha"
+              autoFocus
+              onKeyDown={(e) => {
+                if (e.key === 'Enter' && !creating) {
+                  e.preventDefault()
+                  void handleCreate()
+                }
+              }}
+            />
+            {error && <p className="text-xs text-destructive">{error}</p>}
+          </div>
+          <DialogFooter>
+            <Button
+              variant="outline"
+              onClick={() => {
+                setAddOpen(false)
+                resetAddDialog()
+              }}
+              disabled={creating}
+            >
+              Cancel
+            </Button>
+            <Button onClick={() => void handleCreate()} disabled={creating || !newName.trim()}>
+              {creating ? 'Creating…' : 'Create'}
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+    </div>
+  )
+}