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/note-change-sync.ts

@@ -0,0 +1,23 @@
+import type { Note } from '@/lib/types'
+
+export const NOTE_CHANGE_EVENT = 'memento-note-changed'
+export const NOTE_REQUEST_SAVE_EVENT = 'memento-request-note-save'
+
+export type NoteChangeEvent =
+  | { type: 'updated'; note: Note }
+  | { type: 'deleted'; noteId: string; notebookId?: string | null }
+  | { type: 'created'; note: Note }
+
+export type NoteCollectionActions = {
+  onTogglePin?: (note: Note) => void | Promise<void>
+  onDeleteNote?: (note: Note) => void | Promise<void>
+  onArchiveNote?: (note: Note) => void | Promise<void>
+  onMoveToNotebook?: (note: Note, notebookId: string | null) => void | Promise<void>
+  onNotePatch?: (noteId: string, patch: Partial<Note>) => void
+  onNoteIllustrationGenerated?: (noteId: string) => void | Promise<void>
+}
+
+export function emitNoteChange(detail: NoteChangeEvent) {
+  if (typeof window === 'undefined') return
+  window.dispatchEvent(new CustomEvent(NOTE_CHANGE_EVENT, { detail }))
+}