feat: enhance platform context with recent project tracking and access recording

frontend/src/app/canvas/CanvasMenubar.tsx

@@ -2,8 +2,8 @@
  * Menubar for the canvas page: Project (Import/Export), Edit (Undo/Redo), View (Fit View, Theme).
  */
 
-import React, { useEffect } from 'react'
-import { Link } from 'react-router-dom'
+import React, { useEffect, useMemo } from 'react'
+import { Link, useParams } from 'react-router-dom'
 import {
   Menubar,
   MenubarContent,
@@ -18,6 +18,7 @@ import {
 } from '@/components/ui/menubar'
 import { Kbd, KbdGroup } from '@/components/ui/kbd'
 import { useTheme } from '@/lib/themeContext'
+import { usePlatform } from '@/app/platform/platformContext'
 import { ArrowLeft, Download, FolderOpen, Moon, Redo2, Sun, Undo2 } from 'lucide-react'
 
 export type CanvasMenubarProps = {
@@ -48,6 +49,12 @@ export function CanvasMenubar({
   onFitView,
 }: CanvasMenubarProps) {
   const { theme, setTheme } = useTheme()
+  const { projectId } = useParams<{ projectId: string }>()
+  const { projects } = usePlatform()
+  const projectName = useMemo(
+    () => (projectId ? projects.find((p) => p.id === projectId)?.name ?? null : null),
+    [projectId, projects]
+  )
 
   useEffect(() => {
     const onKeyDown = (ev: KeyboardEvent) => {
@@ -72,87 +79,94 @@ export function CanvasMenubar({
   }, [undo, redo, canUndo, canRedo])
 
   return (
-    <Menubar className="shrink-0 rounded-none border-x-0 border-t-0 border-b-0">
-      <Link
-        to="/projects"
-        aria-label="Back to projects"
-        className="flex shrink-0 items-center rounded-sm px-2 py-1 text-sm outline-none focus:bg-accent focus:text-accent-foreground hover:bg-accent hover:text-accent-foreground"
-      >
-        <ArrowLeft className="size-4" />
-      </Link>
-      <MenubarMenu>
-        <MenubarTrigger className="font-medium">Project</MenubarTrigger>
-        <MenubarContent>
-          <MenubarItem onClick={onImport} className="gap-2">
-            <FolderOpen className="h-4 w-4" />
-            Import…
-          </MenubarItem>
-          <MenubarItem onClick={onExport} className="gap-2">
-            <Download className="h-4 w-4" />
-            Export…
-          </MenubarItem>
-        </MenubarContent>
-      </MenubarMenu>
-      <MenubarMenu>
-        <MenubarTrigger className="font-medium">Edit</MenubarTrigger>
-        <MenubarContent>
-          <MenubarItem onClick={undo} disabled={!canUndo} className="gap-2">
-            <Undo2 className="h-4 w-4" />
-            Undo
-            <span className="ml-auto pl-4">
-              <KbdGroup>
-                <Kbd>⌘ + Z</Kbd>
-              </KbdGroup>
-            </span>
-          </MenubarItem>
-          <MenubarItem onClick={redo} disabled={!canRedo} className="gap-2">
-            <Redo2 className="h-4 w-4" />
-            Redo
-            <span className="ml-auto pl-4">
-              <KbdGroup>
-                <Kbd>⌘ + ⇧ + Z</Kbd>
-              </KbdGroup>
-            </span>
-          </MenubarItem>
-        </MenubarContent>
-      </MenubarMenu>
-      <MenubarMenu>
-        <MenubarTrigger className="font-medium">View</MenubarTrigger>
-        <MenubarContent>
-          {onFitView && (
-            <MenubarItem onClick={onFitView} className="gap-2">
-              Fit View
+    <div className="relative flex h-9 w-full shrink-0 items-center border-b border-border/40 bg-background">
+      <Menubar className="flex-1 shrink-0 rounded-none border-0 border-b-0 bg-transparent p-0 shadow-none">
+        <Link
+          to="/projects"
+          aria-label="Back to projects"
+          className="flex shrink-0 items-center rounded-sm px-2 py-1 ml-1 text-sm outline-none focus:bg-accent focus:text-accent-foreground hover:bg-accent hover:text-accent-foreground"
+        >
+          <ArrowLeft className="size-4" />
+        </Link>
+        <MenubarMenu>
+          <MenubarTrigger className="font-medium">Project</MenubarTrigger>
+          <MenubarContent>
+            <MenubarItem onClick={onImport} className="gap-2">
+              <FolderOpen className="h-4 w-4" />
+              Import…
+            </MenubarItem>
+            <MenubarItem onClick={onExport} className="gap-2">
+              <Download className="h-4 w-4" />
+              Export…
+            </MenubarItem>
+          </MenubarContent>
+        </MenubarMenu>
+        <MenubarMenu>
+          <MenubarTrigger className="font-medium">Edit</MenubarTrigger>
+          <MenubarContent>
+            <MenubarItem onClick={undo} disabled={!canUndo} className="gap-2">
+              <Undo2 className="h-4 w-4" />
+              Undo
               <span className="ml-auto pl-4">
                 <KbdGroup>
-                  <Kbd>⌘0</Kbd>
+                  <Kbd>⌘ + Z</Kbd>
                 </KbdGroup>
               </span>
             </MenubarItem>
-          )}
-          {onFitView && <MenubarSeparator />}
-          <MenubarSub>
-            <MenubarSubTrigger>Theme</MenubarSubTrigger>
-            <MenubarSubContent>
-              <MenubarCheckboxItem
-                checked={theme === 'light'}
-                onCheckedChange={() => setTheme('light')}
-                className="gap-2"
-              >
-                <Sun className="h-4 w-4" />
-                Light
-              </MenubarCheckboxItem>
-              <MenubarCheckboxItem
-                checked={theme === 'dark'}
-                onCheckedChange={() => setTheme('dark')}
-                className="gap-2"
-              >
-                <Moon className="h-4 w-4" />
-                Dark
-              </MenubarCheckboxItem>
-            </MenubarSubContent>
-          </MenubarSub>
-        </MenubarContent>
-      </MenubarMenu>
-    </Menubar>
+            <MenubarItem onClick={redo} disabled={!canRedo} className="gap-2">
+              <Redo2 className="h-4 w-4" />
+              Redo
+              <span className="ml-auto pl-4">
+                <KbdGroup>
+                  <Kbd>⌘ + ⇧ + Z</Kbd>
+                </KbdGroup>
+              </span>
+            </MenubarItem>
+          </MenubarContent>
+        </MenubarMenu>
+        <MenubarMenu>
+          <MenubarTrigger className="font-medium">View</MenubarTrigger>
+          <MenubarContent>
+            {onFitView && (
+              <MenubarItem onClick={onFitView} className="gap-2">
+                Fit View
+                <span className="ml-auto pl-4">
+                  <KbdGroup>
+                    <Kbd>⌘0</Kbd>
+                  </KbdGroup>
+                </span>
+              </MenubarItem>
+            )}
+            {onFitView && <MenubarSeparator />}
+            <MenubarSub>
+              <MenubarSubTrigger>Theme</MenubarSubTrigger>
+              <MenubarSubContent>
+                <MenubarCheckboxItem
+                  checked={theme === 'light'}
+                  onCheckedChange={() => setTheme('light')}
+                  className="gap-2"
+                >
+                  <Sun className="h-4 w-4" />
+                  Light
+                </MenubarCheckboxItem>
+                <MenubarCheckboxItem
+                  checked={theme === 'dark'}
+                  onCheckedChange={() => setTheme('dark')}
+                  className="gap-2"
+                >
+                  <Moon className="h-4 w-4" />
+                  Dark
+                </MenubarCheckboxItem>
+              </MenubarSubContent>
+            </MenubarSub>
+          </MenubarContent>
+        </MenubarMenu>
+      </Menubar>
+      {projectName && (
+        <span className="pointer-events-none absolute left-1/2 -translate-x-1/2 truncate max-w-[40%] text-sm font-medium text-foreground">
+          {projectName}
+        </span>
+      )}
+    </div>
   )
 }

frontend/src/app/platform/AppSidebar.tsx

@@ -1,9 +1,8 @@
 /**
- * Platform sidebar: projects list (ordered, draggable), create, rename, delete.
- * "Projects" link to list; empty state when no projects.
+ * Platform sidebar: All projects, Recently used, New project.
  */
 
-import React, { useCallback, useRef, useState } from 'react'
+import React, { useCallback, useMemo } from 'react'
 import { Link, useNavigate, useParams } from 'react-router-dom'
 import {
   Sidebar,
@@ -13,29 +12,12 @@ import {
   SidebarGroupLabel,
   SidebarHeader,
   SidebarMenu,
-  SidebarMenuAction,
   SidebarMenuButton,
   SidebarMenuItem,
   SidebarRail,
   SidebarTrigger,
 } from '@/components/ui/sidebar'
-import {
-  DropdownMenu,
-  DropdownMenuContent,
-  DropdownMenuItem,
-  DropdownMenuTrigger,
-} from '@/components/ui/dropdown-menu'
-import {
-  Dialog,
-  DialogContent,
-  DialogDescription,
-  DialogFooter,
-  DialogHeader,
-  DialogTitle,
-} from '@/components/ui/dialog'
-import { Button } from '@/components/ui/button'
-import { Input } from '@/components/ui/input'
-import { MoreHorizontal, Plus, Trash2, Pencil, FolderOpen, ListTodo } from 'lucide-react'
+import { Plus, ListTodo } from 'lucide-react'
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip'
 import { useSidebar } from '@/components/ui/sidebar'
 import { usePlatform } from './platformContext'
@@ -44,22 +26,17 @@ import { NewProjectDialog } from './NewProjectDialog'
 import type { Project } from './types'
 
 export function AppSidebar() {
-  const { isMobile, state, setOpen } = useSidebar()
+  const { state, setOpen } = useSidebar()
   const isCollapsed = state === 'collapsed'
-  const { orderedProjects, createProject, deleteProject, renameProject, reorderProjects, projectOrder } = usePlatform()
+  const { orderedProjects, createProject, recentProjectIds } = usePlatform()
+  const recentProjects = useMemo(() => {
+    const byId = new Map(orderedProjects.map((p) => [p.id, p]))
+    return recentProjectIds.map((id) => byId.get(id)).filter((p): p is Project => p != null)
+  }, [orderedProjects, recentProjectIds])
   const navigate = useNavigate()
   const { projectId: selectedProjectId } = useParams<{ projectId: string }>()
-  const dragRef = useRef(false)
-  const [renameTarget, setRenameTarget] = useState<Project | null>(null)
-  const [renameValue, setRenameValue] = useState('')
 
-  const handleSelectProject = useCallback(
-    (id: string) => {
-      if (dragRef.current) return
-      navigate(`/projects/${id}`)
-    },
-    [navigate]
-  )
+  const handleSelectProject = useCallback((id: string) => navigate(`/projects/${id}`), [navigate])
 
   const handleCreateProject = useCallback(
     (project: Parameters<typeof createProject>[0]) => {
@@ -69,58 +46,6 @@ export function AppSidebar() {
     [createProject, navigate]
   )
 
-  const handleDeleteProject = useCallback(
-    (id: string) => {
-      deleteProject(id)
-      if (selectedProjectId === id) navigate('/projects', { replace: true })
-    },
-    [deleteProject, selectedProjectId, navigate]
-  )
-
-  const handleRenameOpen = useCallback((project: Project) => {
-    setRenameTarget(project)
-    setRenameValue(project.name)
-  }, [])
-
-  const handleRenameSubmit = useCallback(() => {
-    if (renameTarget && renameValue.trim()) {
-      renameProject(renameTarget.id, renameValue.trim())
-      setRenameTarget(null)
-      setRenameValue('')
-    }
-  }, [renameTarget, renameValue, renameProject])
-
-  const handleDragStart = useCallback((e: React.DragEvent, projectId: string) => {
-    dragRef.current = true
-    e.dataTransfer.setData('text/plain', projectId)
-    e.dataTransfer.effectAllowed = 'move'
-  }, [])
-
-  const handleDragEnd = useCallback(() => {
-    dragRef.current = false
-  }, [])
-
-  const handleDragOver = useCallback((e: React.DragEvent) => {
-    e.preventDefault()
-    e.dataTransfer.dropEffect = 'move'
-  }, [])
-
-  const handleDrop = useCallback(
-    (e: React.DragEvent, dropTargetId: string) => {
-      e.preventDefault()
-      const draggedId = e.dataTransfer.getData('text/plain')
-      if (!draggedId || draggedId === dropTargetId) return
-      const dropIdx = projectOrder.indexOf(dropTargetId)
-      if (dropIdx === -1) return
-      const next = projectOrder.filter((id) => id !== draggedId)
-      const insertIdx = next.indexOf(dropTargetId)
-      next.splice(insertIdx >= 0 ? insertIdx : next.length, 0, draggedId)
-      reorderProjects(next)
-      dragRef.current = false
-    },
-    [projectOrder, reorderProjects]
-  )
-
   return (
     <>
       <Sidebar collapsible="icon" className="relative">
@@ -202,7 +127,6 @@ export function AppSidebar() {
           onClick={isCollapsed ? (e) => { if ((e.target as HTMLElement).closest('button') || (e.target as HTMLElement).closest('a')) return; setOpen(true) } : undefined}
         >
           <SidebarGroup>
-            <SidebarGroupLabel className="group-data-[collapsible=icon]:hidden">Projects</SidebarGroupLabel>
             <SidebarMenu>
               <SidebarMenuItem>
                 <SidebarMenuButton asChild tooltip="All projects" isActive={!selectedProjectId}>
@@ -212,126 +136,51 @@ export function AppSidebar() {
                   </Link>
                 </SidebarMenuButton>
               </SidebarMenuItem>
-              {orderedProjects.length === 0 ? (
-                <SidebarMenuItem>
-                  <NewProjectDialog
-                    onCreate={handleCreateProject}
-                    existingNames={orderedProjects.map((p) => p.name)}
-                    trigger={
-                      <SidebarMenuButton className="text-sidebar-foreground/70 w-full cursor-pointer">
-                        <Plus className="size-4" />
-                        <span>Create your first project</span>
-                      </SidebarMenuButton>
-                    }
-                  />
-                </SidebarMenuItem>
-              ) : (
-                <>
-                  {orderedProjects.map((project) => {
-                    const Icon = getProjectIcon(project.iconId)
-                    const isActive = selectedProjectId === project.id
-                    return (
-                      <SidebarMenuItem
-                        key={project.id}
-                        data-project-id={project.id}
-                        draggable
-                        onDragStart={(e) => handleDragStart(e, project.id)}
-                        onDragEnd={handleDragEnd}
-                        onDragOver={handleDragOver}
-                        onDrop={(e) => handleDrop(e, project.id)}
-                        className="cursor-grab active:cursor-grabbing"
+            </SidebarMenu>
+          </SidebarGroup>
+          {recentProjects.length > 0 && (
+            <SidebarGroup>
+              <SidebarGroupLabel className="group-data-[collapsible=icon]:hidden">Recently used</SidebarGroupLabel>
+              <SidebarMenu>
+                {recentProjects.map((project) => {
+                  const Icon = getProjectIcon(project.iconId)
+                  const isActive = selectedProjectId === project.id
+                  return (
+                    <SidebarMenuItem key={project.id}>
+                      <SidebarMenuButton
+                        tooltip={project.name}
+                        isActive={isActive}
+                        onClick={() => handleSelectProject(project.id)}
                       >
-                        <SidebarMenuButton
-                          tooltip={project.name}
-                          isActive={isActive}
-                          onClick={() => handleSelectProject(project.id)}
-                        >
-                          <Icon className="size-4" />
-                          <span>{project.name}</span>
-                        </SidebarMenuButton>
-                        <DropdownMenu>
-                          <DropdownMenuTrigger asChild>
-                            <SidebarMenuAction showOnHover>
-                              <MoreHorizontal />
-                              <span className="sr-only">Actions for {project.name}</span>
-                            </SidebarMenuAction>
-                          </DropdownMenuTrigger>
-                          <DropdownMenuContent
-                            className="w-48 rounded-lg"
-                            side={isMobile ? 'bottom' : 'right'}
-                            align={isMobile ? 'end' : 'start'}
-                          >
-                            <DropdownMenuItem asChild>
-                              <Link to={`/projects/${project.id}`}>
-                                <FolderOpen className="size-4" />
-                                Open
-                              </Link>
-                            </DropdownMenuItem>
-                            <DropdownMenuItem onClick={() => handleRenameOpen(project)}>
-                              <Pencil className="size-4" />
-                              Rename
-                            </DropdownMenuItem>
-                            <DropdownMenuItem
-                              className="text-destructive focus:text-destructive"
-                              onClick={() => handleDeleteProject(project.id)}
-                            >
-                              <Trash2 className="size-4" />
-                              Delete project
-                            </DropdownMenuItem>
-                          </DropdownMenuContent>
-                        </DropdownMenu>
-                      </SidebarMenuItem>
-                    )
-                  })}
-                  <SidebarMenuItem>
-                    <NewProjectDialog
-                      onCreate={handleCreateProject}
-                      existingNames={orderedProjects.map((p) => p.name)}
-                      trigger={
-                        <SidebarMenuButton className="text-sidebar-foreground/70 w-full cursor-pointer">
-                          <Plus className="size-4" />
-                          <span>New project</span>
-                        </SidebarMenuButton>
-                      }
-                    />
-                  </SidebarMenuItem>
-                </>
-              )}
+                        <Icon className="size-4" />
+                        <span>{project.name}</span>
+                      </SidebarMenuButton>
+                    </SidebarMenuItem>
+                  )
+                })}
+              </SidebarMenu>
+            </SidebarGroup>
+          )}
+          <SidebarGroup>
+            <SidebarMenu>
+              <SidebarMenuItem>
+                <NewProjectDialog
+                  onCreate={handleCreateProject}
+                  existingNames={orderedProjects.map((p) => p.name)}
+                  trigger={
+                    <SidebarMenuButton className="text-sidebar-foreground/70 w-full cursor-pointer">
+                      <Plus className="size-4" />
+                      <span>{orderedProjects.length === 0 ? 'Create your first project' : 'New project'}</span>
+                    </SidebarMenuButton>
+                  }
+                />
+              </SidebarMenuItem>
             </SidebarMenu>
           </SidebarGroup>
         </SidebarContent>
         <SidebarFooter className="relative z-10" />
         <SidebarRail className="relative z-10" />
       </Sidebar>
-
-      <Dialog open={!!renameTarget} onOpenChange={(open) => !open && setRenameTarget(null)}>
-        <DialogContent>
-          <DialogHeader>
-            <DialogTitle>Rename project</DialogTitle>
-            <DialogDescription>Enter a new name for this project.</DialogDescription>
-          </DialogHeader>
-          <Input
-            value={renameValue}
-            onChange={(e) => setRenameValue(e.target.value)}
-            onKeyDown={(e) => {
-              if (e.key === 'Enter') handleRenameSubmit()
-              if (e.key === 'Escape') setRenameTarget(null)
-            }}
-            placeholder="Project name"
-          />
-          {renameTarget && renameValue.trim() && orderedProjects.some((p) => p.id !== renameTarget.id && p.name.toLowerCase() === renameValue.trim().toLowerCase()) && (
-            <p className="text-xs text-amber-600 dark:text-amber-500">A project with this name already exists.</p>
-          )}
-          <DialogFooter>
-            <Button variant="outline" onClick={() => setRenameTarget(null)}>
-              Cancel
-            </Button>
-            <Button onClick={handleRenameSubmit} disabled={!renameValue.trim()}>
-              Save
-            </Button>
-          </DialogFooter>
-        </DialogContent>
-      </Dialog>
     </>
   )
 }

frontend/src/app/platform/PlatformPage.tsx

@@ -10,7 +10,7 @@ import { AppSidebar } from './AppSidebar'
 
 function PlatformLayoutInner() {
   const { projectId } = useParams<{ projectId: string }>()
-  const { projects } = usePlatform()
+  const { recordProjectAccess } = usePlatform()
   const [sidebarOpen, setSidebarOpen] = useState(true)
 
   useEffect(() => {
@@ -18,6 +18,10 @@ function PlatformLayoutInner() {
     else setSidebarOpen(true)
   }, [projectId])
 
+  useEffect(() => {
+    if (projectId) recordProjectAccess(projectId)
+  }, [projectId, recordProjectAccess])
+
   return (
     <SidebarProvider open={sidebarOpen} onOpenChange={setSidebarOpen}>
       <AppSidebar />

frontend/src/app/platform/platformContext.tsx

@@ -10,6 +10,8 @@ import { PROJECT_VERSION } from './projectGraphStorage'
 
 const STORAGE_KEY = 'zui_platform_projects'
 const ORDER_STORAGE_KEY = 'zui_platform_project_order'
+const RECENT_STORAGE_KEY = 'zui_platform_recent_project_ids'
+const RECENT_MAX = 5
 
 function loadOrder(): string[] {
   try {
@@ -26,6 +28,21 @@ function saveOrder(ids: string[]) {
   localStorage.setItem(ORDER_STORAGE_KEY, JSON.stringify(ids))
 }
 
+function loadRecentIds(): string[] {
+  try {
+    const raw = localStorage.getItem(RECENT_STORAGE_KEY)
+    if (!raw) return []
+    const parsed = JSON.parse(raw) as unknown
+    return Array.isArray(parsed) ? parsed.filter((id): id is string => typeof id === 'string').slice(0, RECENT_MAX) : []
+  } catch {
+    return []
+  }
+}
+
+function saveRecentIds(ids: string[]) {
+  localStorage.setItem(RECENT_STORAGE_KEY, JSON.stringify(ids))
+}
+
 function loadProjects(): Project[] {
   try {
     const raw = localStorage.getItem(STORAGE_KEY)
@@ -80,6 +97,9 @@ export type PlatformContextValue = {
   projectOrder: string[]
   /** Projects in display order (sidebar order, then lastEditedAt) */
   orderedProjects: Project[]
+  /** Last RECENT_MAX accessed project IDs (most recent first) */
+  recentProjectIds: string[]
+  recordProjectAccess: (id: string) => void
   persist: (next: Project[]) => void
   createProject: (project: Project) => void
   deleteProject: (id: string) => void
@@ -94,6 +114,7 @@ const PlatformContext = createContext<PlatformContextValue | null>(null)
 export function PlatformProvider({ children }: { children: React.ReactNode }) {
   const [projects, setProjects] = useState<Project[]>(loadProjects)
   const [projectOrder, setProjectOrder] = useState<string[]>(loadOrder)
+  const [recentProjectIds, setRecentProjectIds] = useState<string[]>(loadRecentIds)
 
   const persist = useCallback((next: Project[]) => {
     setProjects(next)
@@ -122,6 +143,11 @@ export function PlatformProvider({ children }: { children: React.ReactNode }) {
         saveOrder(nextOrder)
         return nextOrder
       })
+      setRecentProjectIds((prev) => {
+        const next = prev.filter((oid) => oid !== id)
+        saveRecentIds(next)
+        return next
+      })
     },
     [projects, persist]
   )
@@ -148,6 +174,14 @@ export function PlatformProvider({ children }: { children: React.ReactNode }) {
     saveOrder(orderedIds)
   }, [])
 
+  const recordProjectAccess = useCallback((id: string) => {
+    setRecentProjectIds((prev) => {
+      const next = [id, ...prev.filter((x) => x !== id)].slice(0, RECENT_MAX)
+      saveRecentIds(next)
+      return next
+    })
+  }, [])
+
   const restoreProject = useCallback(
     (project: Project, graphSnapshot: GraphSnapshot | null) => {
       persist([...projects, project])
@@ -177,6 +211,8 @@ export function PlatformProvider({ children }: { children: React.ReactNode }) {
       projects,
       projectOrder,
       orderedProjects,
+      recentProjectIds,
+      recordProjectAccess,
       persist,
       createProject,
       deleteProject,
@@ -189,6 +225,8 @@ export function PlatformProvider({ children }: { children: React.ReactNode }) {
       projects,
       projectOrder,
       orderedProjects,
+      recentProjectIds,
+      recordProjectAccess,
       persist,
       createProject,
       deleteProject,