feat: brainstorm sessions, PDF document Q&A, embedding fixes, and UI improvements

- Add brainstorm feature with collaborative canvas, AI idea generation, live cursors, playback, and export
- Add PDF upload/extraction/ingestion pipeline with pgvector document search (RAG)
- Add document Q&A overlay with streaming chat and PDF preview
- Add note attachments UI with status polling, grid layout, and auto-scroll
- Add task extraction AI tool and agent executor improvements
- Fix NoteEmbedding missing updatedAt column, re-index 66 notes with 1536-dim embeddings
- Fix brainstorm 'Create Note' button: add success toast and redirect to created note
- Fix memory echo notification infinite polling
- Fix chat route to always include document_search tool
- Add brainstorm i18n keys across all 14 locales
- Add socket server for real-time brainstorm collaboration
- Add hierarchical notebook selector and organize notebook dialog improvements
- Add sidebar brainstorm section with session management
- Update prisma schema with brainstorm tables, attachments, and document chunks

memento-note/components/note-editor/note-editor-full-page.tsx

@@ -10,19 +10,30 @@ import { FusionModal } from '@/components/fusion-modal'
 import { ReminderDialog } from '@/components/reminder-dialog'
 import { ContextualAIChat } from '@/components/contextual-ai-chat'
 import { NoteDocumentInfoPanel } from '@/components/note-document-info-panel'
-import { format } from 'date-fns'
+import { fr } from 'date-fns/locale/fr'
+import { enUS } from 'date-fns/locale/en-US'
+import { formatAbsoluteDateLocalized } from '@/lib/utils/format-localized-date'
 import { ChevronRight } from 'lucide-react'
 import { toast } from 'sonner'
 import { Note } from '@/lib/types'
 import { GhostTags } from '@/components/ghost-tags'
 import { LabelBadge } from '@/components/label-badge'
+import { NoteAttachments } from '@/components/note-attachments'
+import { DocumentQAOverlay } from '@/components/document-qa-overlay'
+import { useLanguage } from '@/lib/i18n'
+import { useState } from 'react'
 
 interface NoteEditorFullPageProps {
   onClose: () => void
 }
 
 export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
+  const { t, language } = useLanguage()
+  const dateLocale = language === 'fr' ? fr : enUS
   const { state, actions, note, readOnly, notebooks, fileInputRef, globalLabels } = useNoteEditorContext()
+  const [docQAAttachment, setDocQAAttachment] = useState<{ id: string; fileName: string } | null>(null)
+  const [attachmentsCount, setAttachmentsCount] = useState(0)
+  const [uploadTrigger, setUploadTrigger] = useState(0)
 
   const notebookName = notebooks.find(nb => nb.id === note.notebookId)?.name || null
 
@@ -40,7 +51,7 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
         <div className="flex-1 flex flex-col overflow-y-auto bg-white dark:bg-background">
 
           {/* TOOLBAR */}
-          <NoteEditorToolbar mode="fullPage" onClose={onClose} />
+          <NoteEditorToolbar mode="fullPage" onClose={onClose} onToggleAttachments={() => setUploadTrigger(v => v + 1)} attachmentsCount={attachmentsCount} />
 
           {/* BODY — max-w-4xl, responsive px, py-16 */}
           <div className="max-w-4xl mx-auto w-full px-6 sm:px-12 py-16 space-y-12 min-w-0">
@@ -52,7 +63,7 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
                 {notebookName && <span style={{ color: 'var(--color-ink)' }}>{notebookName}</span>}
                 {notebookName && <ChevronRight size={10} style={{ color: 'var(--color-concrete)' }} />}
                 <span suppressHydrationWarning style={{ color: 'var(--color-concrete)' }}>
-                  {format(new Date(note.contentUpdatedAt), 'MMM d, yyyy')}
+                  {formatAbsoluteDateLocalized(new Date(note.contentUpdatedAt), language, 'MMM d, yyyy', dateLocale)}
                 </span>
               </div>
 
@@ -94,8 +105,15 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
             )}
 
             {/* Content area — max-w-3xl for wider reading column */}
-            <div className="max-w-3xl mx-auto w-full pb-32">
+            <div className="max-w-3xl mx-auto w-full space-y-8 pb-32">
               <NoteContentArea />
+
+               <NoteAttachments
+                 noteId={note.id}
+                 onOpenDocQA={(att) => setDocQAAttachment(att)}
+                 onCountChange={setAttachmentsCount}
+                 triggerUpload={uploadTrigger}
+               />
             </div>
           </div>
         </div>
@@ -124,7 +142,7 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
                 const plain = state.content.replace(/<[^>]+>/g, ' ').trim()
                 const wordCount = plain.split(/\s+/).filter(Boolean).length
                 if (wordCount < 10) {
-                  toast.error('Ajoutez au moins 10 mots avant de générer un titre.')
+                  toast.error(t('ai.titleGenerationMinWords', { count: wordCount }))
                   return
                 }
                 actions.setIsProcessingAI(true)
@@ -139,14 +157,14 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
                     const s = data.suggestions?.[0]?.title ?? ''
                     if (s) {
                       actions.setTitle(s)
-                      toast.success('Titre généré !')
+                      toast.success(t('ai.titleApplied'))
                     } else {
-                      toast.error('Impossible de générer un titre.')
+                      toast.error(t('ai.titleGenerationFailed'))
                     }
                   } else {
-                    toast.error('Erreur lors de la génération du titre.')
+                    toast.error(t('ai.titleGenerationError'))
                   }
-                } catch { toast.error('Erreur réseau.') } finally { actions.setIsProcessingAI(false) }
+                } catch { toast.error(t('ai.networkErrorShort')) } finally { actions.setIsProcessingAI(false) }
               }}
             />
           </div>
@@ -166,6 +184,20 @@ export function NoteEditorFullPage({ onClose }: NoteEditorFullPageProps) {
       </div>
 
       <input ref={fileInputRef} type="file" accept="image/*" multiple className="hidden" onChange={actions.handleImageUpload} />
+
+      {docQAAttachment && (
+        <DocumentQAOverlay
+          attachment={docQAAttachment}
+          noteId={note.id}
+          noteContent={state.content}
+          onClose={() => setDocQAAttachment(null)}
+          onApplyToNote={(content) => {
+            actions.setPreviousContentForCopilot(state.content)
+            actions.setContent(state.content + '\n\n' + content)
+          }}
+        />
+      )}
+
       <ReminderDialog
         open={state.showReminderDialog}
         onOpenChange={actions.setShowReminderDialog}