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/context/notebooks-context.tsx

@@ -57,6 +57,9 @@ export interface NotebooksContextValue {
   createNotebookOptimistic: (data: CreateNotebookInput) => Promise<void>
   updateNotebook: (notebookId: string, data: UpdateNotebookInput) => Promise<void>
   deleteNotebook: (notebookId: string) => Promise<void>
+  trashNotebook: (notebookId: string) => Promise<void>
+  restoreNotebook: (notebookId: string) => Promise<void>
+  permanentDeleteNotebook: (notebookId: string) => Promise<void>
   updateNotebookOrderOptimistic: (notebookIds: string[]) => Promise<void>
   setCurrentNotebook: (notebook: Notebook | null) => void
 
@@ -215,6 +218,52 @@ export function NotebooksProvider({ children, initialNotebooks = [] }: Notebooks
     triggerRefresh()
   }, [queryClient, triggerNotebooksRefresh, triggerRefresh])
 
+  const trashNotebook = useCallback(async (notebookId: string) => {
+    const response = await fetch(`/api/notebooks/${notebookId}`, {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ trashedAt: new Date().toISOString() }),
+    })
+
+    if (!response.ok) {
+      throw new Error('Failed to trash notebook')
+    }
+
+    queryClient.invalidateQueries({ queryKey: queryKeys.notebooks() })
+    triggerNotebooksRefresh()
+    triggerRefresh()
+  }, [queryClient, triggerNotebooksRefresh, triggerRefresh])
+
+  const restoreNotebook = useCallback(async (notebookId: string) => {
+    const response = await fetch(`/api/notebooks/${notebookId}`, {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ trashedAt: null }),
+    })
+
+    if (!response.ok) {
+      throw new Error('Failed to restore notebook')
+    }
+
+    queryClient.invalidateQueries({ queryKey: queryKeys.notebooks() })
+    triggerNotebooksRefresh()
+    triggerRefresh()
+  }, [queryClient, triggerNotebooksRefresh, triggerRefresh])
+
+  const permanentDeleteNotebook = useCallback(async (notebookId: string) => {
+    const response = await fetch(`/api/notebooks/${notebookId}`, {
+      method: 'DELETE',
+    })
+
+    if (!response.ok) {
+      throw new Error('Failed to permanently delete notebook')
+    }
+
+    queryClient.invalidateQueries({ queryKey: queryKeys.notebooks() })
+    triggerNotebooksRefresh()
+    triggerRefresh()
+  }, [queryClient, triggerNotebooksRefresh, triggerRefresh])
+
   const updateNotebookOrderOptimistic = useCallback(async (notebookIds: string[]) => {
     const response = await fetch('/api/notebooks/reorder', {
       method: 'POST',
@@ -378,6 +427,9 @@ export function NotebooksProvider({ children, initialNotebooks = [] }: Notebooks
     createNotebookOptimistic,
     updateNotebook,
     deleteNotebook,
+    trashNotebook,
+    restoreNotebook,
+    permanentDeleteNotebook,
     updateNotebookOrderOptimistic,
     setCurrentNotebook,
     createLabel,
@@ -403,6 +455,9 @@ export function NotebooksProvider({ children, initialNotebooks = [] }: Notebooks
     createNotebookOptimistic,
     updateNotebook,
     deleteNotebook,
+    trashNotebook,
+    restoreNotebook,
+    permanentDeleteNotebook,
     updateNotebookOrderOptimistic,
     createLabel,
     updateLabel,