feat(notes): liens internes, onglet Réseau, living blocks et consentement IA

Rend les liens entre notes visibles et persistants (sync NoteLink au save, auto-save, graphe réseau rafraîchi), ajoute living blocks, Memory Echo, recherche globale, consentement IA explicite et consolide les prototypes design en architectural-grid.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/lib/notes-view-preference.ts

@@ -0,0 +1,31 @@
+import type { NotesLayoutMode, NotesViewType } from '@/components/notes-list-views'
+
+export const NOTES_LAYOUT_COOKIE = 'memento-notes-layout'
+export const NOTES_VIEW_TYPE_COOKIE = 'memento-notes-view-type'
+export const NOTES_LAYOUT_STORAGE_KEY = 'memento-notes-layout'
+export const NOTES_VIEW_TYPE_STORAGE_KEY = 'memento-notes-view-type'
+
+const LAYOUT_VALUES: NotesLayoutMode[] = ['grid', 'list', 'table']
+const VIEW_TYPE_VALUES: NotesViewType[] = ['notes', 'tasks']
+
+export function parseNotesLayoutMode(value: string | undefined | null): NotesLayoutMode {
+  if (value && (LAYOUT_VALUES as string[]).includes(value)) return value as NotesLayoutMode
+  return 'list'
+}
+
+export function parseNotesViewType(value: string | undefined | null): NotesViewType {
+  if (value && (VIEW_TYPE_VALUES as string[]).includes(value)) return value as NotesViewType
+  return 'notes'
+}
+
+export function setNotesLayoutPreference(layout: NotesLayoutMode) {
+  if (typeof window === 'undefined') return
+  localStorage.setItem(NOTES_LAYOUT_STORAGE_KEY, layout)
+  document.cookie = `${NOTES_LAYOUT_COOKIE}=${layout}; path=/; max-age=31536000; SameSite=Lax`
+}
+
+export function setNotesViewTypePreference(viewType: NotesViewType) {
+  if (typeof window === 'undefined') return
+  localStorage.setItem(NOTES_VIEW_TYPE_STORAGE_KEY, viewType)
+  document.cookie = `${NOTES_VIEW_TYPE_COOKIE}=${viewType}; path=/; max-age=31536000; SameSite=Lax`
+}