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/app/api/blocks/resolve/route.ts

@@ -0,0 +1,68 @@
+import { NextRequest, NextResponse } from 'next/server'
+import prisma from '@/lib/prisma'
+import { auth } from '@/auth'
+import { pickBestBlockForHint, pickBestPlainPassageForHint } from '@/lib/blocks/extract-blocks'
+
+/**
+ * GET /api/blocks/resolve?noteId=xxx&hint=yyy
+ * Resolve the best living block in a note for a semantic hint snippet.
+ */
+export async function GET(request: NextRequest) {
+  const session = await auth()
+  if (!session?.user?.id) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  const noteId = request.nextUrl.searchParams.get('noteId')
+  const hint = request.nextUrl.searchParams.get('hint') || ''
+
+  if (!noteId) {
+    return NextResponse.json({ error: 'noteId required' }, { status: 400 })
+  }
+
+  const note = await prisma.note.findFirst({
+    where: { id: noteId, userId: session.user.id },
+    select: {
+      id: true,
+      title: true,
+      content: true,
+      notebookId: true,
+    },
+  })
+
+  if (!note) {
+    return NextResponse.json({ error: 'Note not found' }, { status: 404 })
+  }
+
+  const liveBlock = pickBestBlockForHint(note.content, hint)
+  const block = liveBlock ?? pickBestPlainPassageForHint(note.content, hint)
+  if (!block) {
+    return NextResponse.json({ error: 'no_block_found' }, { status: 404 })
+  }
+
+  const mode = liveBlock?.blockId ? 'live' : 'citation'
+
+  let notebookName = ''
+  if (note.notebookId) {
+    const notebook = await prisma.notebook.findFirst({
+      where: { id: note.notebookId, userId: session.user.id },
+      select: { name: true },
+    })
+    notebookName = notebook?.name || ''
+  }
+
+  const words = block.content.split(/\s+/)
+  const snippet = words.slice(0, 30).join(' ') + (words.length > 30 ? '…' : '')
+
+  return NextResponse.json({
+    mode,
+    block: {
+      blockId: block.blockId,
+      noteId: note.id,
+      noteTitle: note.title || '',
+      notebookName,
+      content: block.content,
+      snippet,
+    },
+  })
+}