fix(brainstorm): notebookId URL param + lookup carnet + bouton 'Open notebook'

- brainstorm-page.tsx: lit urlNotebookId depuis URL params
- useConvertIdea accepte targetNotebookId (hook mis à jour)
- handleConvert prend le carnet ciblé en paramètre
- URL notebookId propage via router.push depuis le modal de confirmation
- toast inclut le nom du carnet et un bouton 'Open notebook' qui redirige vers /home?notebook=X
- peek panel affiche un lien vers le carnet source en haut du titre
- useNotebooks pour le lookup du nom depuis notebooks

Vrai fix: les notes vont maintenant là où l'utilisateur a choisi,
pas dans un carnet auto-créé sans qu'il s'en aperçoive.

memento-note/components/brainstorm/brainstorm-page.tsx

@@ -1,5 +1,6 @@
 'use client'
 import { toast } from 'sonner'
+import { useNotebooks } from '@/context/notebooks-context'
 
 import React, { useState, useMemo, useEffect, useRef, useCallback } from 'react'
 import { useRouter, useSearchParams } from 'next/navigation'
@@ -80,12 +81,14 @@ const WAVE_COLORS: Record<number, { border: string; bg: string; text: string }>
 export function BrainstormPage() {
   const router = useRouter()
   const peek = useNotePeek()
+  const { notebooks } = useNotebooks()
   const searchParams = useSearchParams()
   const { t, language } = useLanguage()
   const { data: authSession } = useSession()
   const urlSessionId = searchParams.get('session')
   const urlSeed = searchParams.get('seed')
   const urlSourceNoteId = searchParams.get('sourceNoteId')
+  const urlNotebookId = searchParams.get('notebookId')
   const urlInviteToken = searchParams.get('invite')
 
   const [seedInput, setSeedInput] = useState('')
@@ -242,17 +245,25 @@ export function BrainstormPage() {
     } catch {}
   }
 
-  const handleConvert = async (idea: BrainstormIdea) => {
+  const handleConvert = async (idea: BrainstormIdea, targetNotebookId: string | null = urlNotebookId) => {
     try {
-      const result = await convertIdea.mutateAsync({ ideaId: idea.id, notebookId: null })
+      const result = await convertIdea.mutateAsync({ ideaId: idea.id, notebookId: targetNotebookId })
       if (result?.id) {
+        let nbName = 'carnet'
+        if (result.notebookId) {
+          const nb = notebooks.find(n => n.id === result.notebookId)
+          nbName = nb?.name || 'carnet'
+        }
         toast.success(t('brainstorm.noteCreatedIn') || 'Note created', {
-          description: result.title || idea.title,
+          description: `${result.title || idea.title} → 📁 ${nbName}`,
           action: {
-            label: t('notePeek.openFully') || 'Open',
-            onClick: () => router.push(`/home?openNote=${result.id}`),
+            label: t('brainstorm.openNotebook') || 'Open notebook',
+            onClick: () => {
+              if (result.notebookId) router.push(`/home?notebook=${result.notebookId}`)
+              else router.push('/home')
+            },
           },
-          duration: 10000,
+          duration: 15000,
         })
         peek.open(result.id)
       }

memento-note/components/note-peek/note-peek-panel.tsx

@@ -2,7 +2,7 @@
 
 import { type ReactNode } from 'react'
 import { motion, AnimatePresence, useReducedMotion } from 'motion/react'
-import { X, Maximize2, Loader2 } from 'lucide-react'
+import { X, Maximize2, Loader2, FolderOpen } from 'lucide-react'
 import { useLanguage } from '@/lib/i18n'
 import type { Note } from '@/lib/types'
 import { NotePeekContent } from './note-peek-content'
@@ -77,6 +77,15 @@ export function NotePeekPanel({
               renderContent(note, blockId)
             ) : (
               <>
+                {note.notebookId && (
+                  <a
+                    href={`/home?notebook=${note.notebookId}`}
+                    className="inline-flex items-center gap-1.5 text-[10px] font-bold uppercase tracking-widest text-brand-accent hover:text-brand-accent/70 transition-colors mb-2 cursor-pointer"
+                  >
+                    <FolderOpen size={11} />
+                    {t('brainstorm.openNotebook') || 'Open notebook'}
+                  </a>
+                )}
                 <h2 className="text-xl font-serif font-medium text-ink dark:text-dark-ink mb-6">
                   {note.title || t('notePeek.untitled') || 'Untitled'}
                 </h2>

memento-note/locales/en.json

@@ -3076,7 +3076,8 @@
     "noNotebook": "No notebook",
     "launching": "Launching…",
     "launch": "Brainstorm",
-    "noteCreatedIn": "Note created in"
+    "noteCreatedIn": "Note created in",
+    "openNotebook": "Open notebook"
   },
   "byokSettings": {
     "title": "Your API keys (BYOK)",

memento-note/locales/fr.json

@@ -3080,7 +3080,8 @@
     "noNotebook": "Aucun carnet",
     "launching": "Lancement…",
     "launch": "Brainstormer",
-    "noteCreatedIn": "Note créée dans"
+    "noteCreatedIn": "Note créée dans",
+    "openNotebook": "Ouvrir le carnet"
   },
   "byokSettings": {
     "title": "Vos clés API (BYOK)",