feat: hierarchical notebook system - trash, selectors, breadcrumb, sidebar tree

- Schema: soft delete with trashedAt on Notebook model
- API: PATCH/GET notebooks support trashedAt filtering with cascade
- Sidebar: recursive tree rendering with collapse/expand, visual guides, hover actions
- HierarchicalNotebookSelector: portal-based dropdown with search, breadcrumbs, dropUp support
- AI chat: context selector with Toutes mes notes + notebook selector
- Agent detail: flat selects replaced with HierarchicalNotebookSelector
- Breadcrumb: notebook path display on home page
- Trash view: card grid with countdown, restore/permanent delete
- CSS: design tokens (ink, paper, blueprint, concrete, etc.)
- Types: parentId, trashedAt added to Notebook interface

memento-note/app/actions/notes.ts

@@ -1053,7 +1053,6 @@ export async function emptyTrash() {
   if (!session?.user?.id) throw new Error('Unauthorized');
 
   try {
-    // Fetch trashed notes with images before deleting
     const trashedNotes = await prisma.note.findMany({
       where: {
         userId: session.user.id,
@@ -1069,7 +1068,6 @@ export async function emptyTrash() {
       }
     })
 
-    // Clean up image files for all deleted notes
     for (const note of trashedNotes) {
       const imageUrls = parseImageUrls(note.images)
       if (imageUrls.length > 0) {
@@ -1077,6 +1075,13 @@ export async function emptyTrash() {
       }
     }
 
+    await prisma.notebook.deleteMany({
+      where: {
+        userId: session.user.id,
+        trashedAt: { not: null }
+      }
+    })
+
     await syncLabels(session.user.id, [])
     revalidatePath('/trash')
     revalidatePath('/')
@@ -1137,14 +1142,44 @@ export async function getTrashCount() {
   if (!session?.user?.id) return 0;
 
   try {
-    return await prisma.note.count({
+    const [noteCount, notebookCount] = await Promise.all([
+      prisma.note.count({
+        where: {
+          userId: session.user.id,
+          trashedAt: { not: null }
+        }
+      }),
+      prisma.notebook.count({
+        where: {
+          userId: session.user.id,
+          trashedAt: { not: null }
+        }
+      })
+    ])
+    return noteCount + notebookCount
+  } catch {
+    return 0
+  }
+}
+
+export async function getTrashedNotebooks() {
+  const session = await auth();
+  if (!session?.user?.id) return [];
+
+  try {
+    return await prisma.notebook.findMany({
       where: {
         userId: session.user.id,
         trashedAt: { not: null }
-      }
+      },
+      include: {
+        _count: { select: { notes: true } }
+      },
+      orderBy: { trashedAt: 'desc' }
     })
-  } catch {
-    return 0
+  } catch (error) {
+    console.error('Error fetching trashed notebooks:', error)
+    return []
   }
 }