feat: add slides generation tool with multiple slide types

- Add slides.tool.ts with support for title, bullets, chart, stats, table, cards, timeline, quote, comparison, equation, image, summary slide types
- Chart types: bar, horizontal-bar, line, donut, radar
- Integrate with agent executor and canvas system
- Add multilingual support (en/fr)
- Various UI improvements and bug fixes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

memento-note/app/api/notes/[id]/backlinks/route.ts

@@ -0,0 +1,42 @@
+import { NextRequest, NextResponse } from 'next/server'
+import prisma from '@/lib/prisma'
+import { auth } from '@/auth'
+
+// GET /api/notes/[id]/backlinks
+// Returns all notes that link TO this note via [[wikilinks]]
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const session = await auth()
+  if (!session?.user?.id) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  const { id } = await params
+
+  // Verify the note belongs to the user
+  const note = await prisma.note.findUnique({ where: { id }, select: { userId: true } })
+  if (!note || note.userId !== session.user.id) {
+    return NextResponse.json({ error: 'Not found' }, { status: 404 })
+  }
+
+  const backlinks = await (prisma as any).noteLink.findMany({
+    where: { targetNoteId: id },
+    include: {
+      sourceNote: {
+        select: { id: true, title: true, updatedAt: true, notebookId: true },
+      },
+    },
+    orderBy: { createdAt: 'desc' },
+  })
+
+  return NextResponse.json({
+    backlinks: backlinks.map((bl: any) => ({
+      id: bl.id,
+      sourceNote: bl.sourceNote,
+      contextSnippet: bl.contextSnippet,
+      createdAt: bl.createdAt,
+    })),
+  })
+}