feat: hierarchical notebooks (tree), remove all list view code, delete 22 unused files

- Add parentId to Notebook model (tree structure)
- Update sidebar to render parent/child notebooks with expand/collapse
- Add sub-notebook creation from parent notebook
- Remove 'list' from NotesViewMode type everywhere
- Delete 22 unused components, hooks, and UI files
- Wrap revalidatePath in try-catch to prevent save 500
- Update notebook API to support parentId in creation

memento-note/app/(main)/page.tsx

@@ -13,9 +13,7 @@ export default async function HomePage() {
       ? ('masonry' as const)
       : settings?.notesViewMode === 'tabs'
         ? ('tabs' as const)
-        : settings?.notesViewMode === 'list'
-          ? ('list' as const)
-          : ('masonry' as const)
+        : ('masonry' as const)
 
   return (
     <HomeClient

memento-note/app/actions/ai-settings.ts

@@ -14,7 +14,7 @@ export type UserAISettingsData = {
   preferredLanguage?: 'auto' | 'en' | 'fr' | 'es' | 'de' | 'fa' | 'it' | 'pt' | 'ru' | 'zh' | 'ja' | 'ko' | 'ar' | 'hi' | 'nl' | 'pl'
   demoMode?: boolean
   showRecentNotes?: boolean
-  notesViewMode?: 'masonry' | 'tabs' | 'list'
+  notesViewMode?: 'masonry' | 'tabs'
   emailNotifications?: boolean
   desktopNotifications?: boolean
   anonymousAnalytics?: boolean
@@ -64,8 +64,7 @@ function pickUserAISettingsForDb(input: UserAISettingsData): Partial<Record<User
   if (
     out.notesViewMode != null &&
     out.notesViewMode !== 'masonry' &&
-    out.notesViewMode !== 'tabs' &&
-    out.notesViewMode !== 'list'
+    out.notesViewMode !== 'tabs'
   ) {
     delete out.notesViewMode
   }
@@ -170,9 +169,7 @@ const getCachedAISettings = unstable_cache(
           ? ('masonry' as const)
           : raw === 'tabs'
             ? ('tabs' as const)
-            : raw === 'list'
-              ? ('list' as const)
-              : ('masonry' as const)
+            : ('masonry' as const)
 
       return {
         titleSuggestions: settings.titleSuggestions,

memento-note/app/api/notebooks/route.ts

@@ -6,7 +6,23 @@ import { revalidatePath } from 'next/cache'
 const DEFAULT_COLORS = ['#3B82F6', '#8B5CF6', '#EC4899', '#F59E0B', '#10B981', '#06B6D4']
 const DEFAULT_ICONS = ['📁', '📚', '💼', '🎯', '📊', '🎨', '💡', '🔧']
 
-// GET /api/notebooks - Get all notebooks for current user
+function buildTree(notebooks: any[]): any[] {
+  const map = new Map<string, any>()
+  const roots: any[] = []
+  for (const nb of notebooks) {
+    map.set(nb.id, { ...nb, children: [] })
+  }
+  for (const nb of notebooks) {
+    const node = map.get(nb.id)!
+    if (nb.parentId && map.has(nb.parentId)) {
+      map.get(nb.parentId)!.children.push(node)
+    } else {
+      roots.push(node)
+    }
+  }
+  return roots
+}
+
 export async function GET(request: NextRequest) {
   const session = await auth()
   if (!session?.user?.id) {
@@ -17,9 +33,7 @@ export async function GET(request: NextRequest) {
     const notebooks = await prisma.notebook.findMany({
       where: { userId: session.user.id },
       include: {
-        labels: {
-          orderBy: { name: 'asc' }
-        },
+        labels: { orderBy: { name: 'asc' } },
         _count: {
           select: { notes: { where: { isArchived: false, trashedAt: null } } }
         }
@@ -27,23 +41,20 @@ export async function GET(request: NextRequest) {
       orderBy: { order: 'asc' }
     })
 
-    return NextResponse.json({
-      success: true,
-      notebooks: notebooks.map(nb => ({
-        ...nb,
-        notesCount: nb._count.notes
-      }))
-    })
+    const flat = notebooks.map(nb => ({
+      ...nb,
+      notesCount: nb._count.notes
+    }))
+
+    const tree = buildTree(flat)
+
+    return NextResponse.json({ success: true, notebooks: flat, tree })
   } catch (error) {
     console.error('Error fetching notebooks:', error)
-    return NextResponse.json(
-      { success: false, error: 'Failed to fetch notebooks' },
-      { status: 500 }
-    )
+    return NextResponse.json({ success: false, error: 'Failed to fetch notebooks' }, { status: 500 })
   }
 }
 
-// POST /api/notebooks - Create a new notebook
 export async function POST(request: NextRequest) {
   const session = await auth()
   if (!session?.user?.id) {
@@ -52,42 +63,49 @@ export async function POST(request: NextRequest) {
 
   try {
     const body = await request.json()
-    const { name, icon, color } = body
+    const { name, icon, color, parentId } = body
 
     if (!name || typeof name !== 'string') {
-      return NextResponse.json(
-        { success: false, error: 'Notebook name is required' },
-        { status: 400 }
-      )
+      return NextResponse.json({ success: false, error: 'Notebook name is required' }, { status: 400 })
     }
 
-    // Get the highest order value for this user
+    if (parentId) {
+      const parent = await prisma.notebook.findFirst({
+        where: { id: parentId, userId: session.user.id }
+      })
+      if (!parent) {
+        return NextResponse.json({ success: false, error: 'Parent notebook not found' }, { status: 400 })
+      }
+    }
+
+    const whereClause: any = { userId: session.user.id }
+    if (parentId) whereClause.parentId = parentId
+    else whereClause.parentId = null
+
     const highestOrder = await prisma.notebook.findFirst({
-      where: { userId: session.user.id },
+      where: whereClause,
       orderBy: { order: 'desc' },
       select: { order: true }
     })
 
     const nextOrder = (highestOrder?.order ?? -1) + 1
 
-    // Create notebook
     const notebook = await prisma.notebook.create({
       data: {
         name: name.trim(),
         icon: icon || DEFAULT_ICONS[Math.floor(Math.random() * DEFAULT_ICONS.length)],
         color: color || DEFAULT_COLORS[Math.floor(Math.random() * DEFAULT_COLORS.length)],
         order: nextOrder,
+        parentId: parentId || null,
         userId: session.user.id
       },
       include: {
         labels: true,
-        _count: {
-          select: { notes: { where: { isArchived: false, trashedAt: null } } }
-        }
+        _count: { select: { notes: { where: { isArchived: false, trashedAt: null } } } }
       }
     })
 
-    revalidatePath('/')
+    try { revalidatePath('/') } catch {}
 
     return NextResponse.json({
       success: true,
@@ -96,9 +114,6 @@ export async function POST(request: NextRequest) {
     }, { status: 201 })
   } catch (error) {
     console.error('Error creating notebook:', error)
-    return NextResponse.json(
-      { success: false, error: 'Failed to create notebook' },
-      { status: 500 }
-    )
+    return NextResponse.json({ success: false, error: 'Failed to create notebook' }, { status: 500 })
   }
 }