fix: replace raw ai_consent_required code with translatable message and consent prompt

- Centralize AI consent 403 responses in server-consent helpers
- Return human-readable message + code + i18n errorKey from all AI APIs
- Update dashboard and AI clients to detect code/errorKey and translate
- Add consent.ai.requiredToast i18n keys (fr/en)

memento-note/app/api/ai/auto-labels/route.ts

@@ -3,7 +3,7 @@ import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { autoLabelCreationService } from '@/lib/ai/services'
 import { getAISettings } from '@/app/actions/ai-settings'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenJson } from '@/lib/consent/server-consent'
 import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'
 
 /**
@@ -23,10 +23,7 @@ export async function POST(request: NextRequest) {
 
     // GDPR AI Consent check
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json(
+      return aiConsentForbiddenJson()
-        { success: false, error: 'ai_consent_required' },
-        { status: 403 }
-      )
     }
 
     // Respect user's autoLabeling toggle

memento-note/app/api/ai/batch-organize/route.ts

@@ -1,7 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { batchOrganizationService } from '@/lib/ai/services'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenJson } from '@/lib/consent/server-consent'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
 
 /**
@@ -20,10 +20,7 @@ export async function POST(request: NextRequest) {
 
     // GDPR AI Consent check
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json(
+      return aiConsentForbiddenJson()
-        { success: false, error: 'ai_consent_required' },
-        { status: 403 }
-      )
     }
 
     // Get language from request headers or body

memento-note/app/api/ai/describe-image/route.ts

@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { getAISettings } from '@/app/actions/ai-settings'
 import { describeImages } from '@/lib/ai/services/image-description.service'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'
 
 export async function POST(req: NextRequest) {
@@ -13,7 +13,7 @@ export async function POST(req: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const userSettings = await getAISettings(session.user.id)

memento-note/app/api/ai/echo/connections/route.ts

@@ -1,7 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { memoryEchoService } from '@/lib/ai/services/memory-echo.service'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 
 /**
  * GET /api/ai/echo/connections?noteId={id}&page={page}&limit={limit}
@@ -19,10 +19,7 @@ export async function GET(req: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json(
+      return aiConsentForbiddenResponse()
-        { error: 'ai_consent_required' },
-        { status: 403 }
-      )
     }
 
     // Get query parameters

memento-note/app/api/ai/echo/fusion/route.ts

@@ -3,7 +3,7 @@ import { auth } from '@/auth'
 import { getChatProvider } from '@/lib/ai/factory'
 import { getSystemConfig } from '@/lib/config'
 import prisma from '@/lib/prisma'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'
 
 /**
@@ -22,7 +22,7 @@ export async function POST(req: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const body = await req.json()

memento-note/app/api/ai/echo/route.ts

@@ -1,7 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { memoryEchoService } from '@/lib/ai/services/memory-echo.service'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
 
 /**
@@ -21,10 +21,7 @@ export async function GET(req: NextRequest) {
 
     // GDPR AI Consent check
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json(
+      return aiConsentForbiddenResponse()
-        { error: 'ai_consent_required' },
-        { status: 403 }
-      )
     }
 
     // Get next insight (respects frequency limits)

memento-note/app/api/ai/enrich-from-resource/route.ts

@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { getSystemConfig } from '@/lib/config'
 import { getTagsProvider } from '@/lib/ai/factory'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'
 
 export async function POST(request: NextRequest) {
@@ -13,7 +13,7 @@ export async function POST(request: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const { existingContent, resourceText, mode, language, format } = await request.json()

memento-note/app/api/ai/notebook-slides/route.ts

@@ -0,0 +1,62 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
+import { generateSlideDeck } from '@/lib/ai/services/slide-deck-generator.service'
+
+export async function POST(request: NextRequest) {
+  try {
+    const session = await auth()
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    if (!(await hasUserAiConsent())) {
+      return aiConsentForbiddenResponse()
+    }
+    const userId = session.user.id
+
+    const body = await request.json()
+    const { notebookId, theme, purpose, audience, slideCount, language } = body
+
+    if (!notebookId || typeof notebookId !== 'string') {
+      return NextResponse.json({ error: 'notebookId is required' }, { status: 400 })
+    }
+
+    const intent =
+      purpose || audience || slideCount
+        ? {
+            purpose: purpose || 'auto',
+            audience: audience || 'auto',
+            slideCount: typeof slideCount === 'number' ? slideCount : undefined,
+            template: 'auto' as const,
+          }
+        : null
+
+    const result = await withAiQuota(
+      userId,
+      'slide_generate',
+      () =>
+        generateSlideDeck({
+          userId,
+          sourceNotebookId: notebookId,
+          theme: theme && theme !== 'auto' ? theme : null,
+          lang: language === 'en' ? 'en' : 'fr',
+          intent,
+        }),
+      { lane: 'chat' },
+    )
+
+    if (!result.success) {
+      return NextResponse.json({ error: result.error || 'Failed to generate slides' }, { status: 500 })
+    }
+
+    return NextResponse.json(result)
+  } catch (error: unknown) {
+    const quotaResp = handleQuotaHttpError(error)
+    if (quotaResp) return quotaResp
+    console.error('[NotebookSlides] Error:', error)
+    const message = error instanceof Error ? error.message : 'Failed to generate slides'
+    return NextResponse.json({ error: message }, { status: 500 })
+  }
+}

memento-note/app/api/ai/notebook-summary/route.ts

@@ -2,7 +2,7 @@ import { rateLimit } from '@/lib/rate-limit'
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { notebookSummaryService } from '@/lib/ai/services'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenJson } from '@/lib/consent/server-consent'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
 
 /**
@@ -20,10 +20,7 @@ export async function POST(request: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json(
+      return aiConsentForbiddenJson()
-        { success: false, error: 'ai_consent_required' },
-        { status: 403 }
-      )
     }
 
     const body = await request.json()

memento-note/app/api/ai/personas/route.ts

@@ -3,7 +3,7 @@ import { auth } from '@/auth'
 import { getSystemConfig } from '@/lib/config'
 import { getTagsProvider } from '@/lib/ai/factory'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 
 export type PersonaId = 'engineer' | 'financial' | 'customer' | 'skeptic' | 'optimist'
 
@@ -70,7 +70,7 @@ export async function POST(request: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const { content, title, personaId } = await request.json()

memento-note/app/api/ai/reformulate/route.ts

@@ -3,7 +3,7 @@ import { auth } from '@/auth'
 import { paragraphRefactorService } from '@/lib/ai/services/paragraph-refactor.service'
 import { getAISettings } from '@/app/actions/ai-settings'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 
 export async function POST(request: NextRequest) {
   try {
@@ -14,7 +14,7 @@ export async function POST(request: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     // Respect user's paragraphRefactor toggle (Assistant IA)

memento-note/app/api/ai/suggest-charts/route.ts

@@ -5,7 +5,7 @@ import { getSystemConfig } from '@/lib/config'
 import { prisma } from '@/lib/prisma'
 import { auth } from '@/auth'
 import { reserveUsageOrThrow, QuotaExceededError, QuotaServiceUnavailableError } from '@/lib/entitlements'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 
 export const maxDuration = 30
 
@@ -41,10 +41,7 @@ export async function POST(req: Request) {
   }
 
   if (!(await hasUserAiConsent())) {
-    return new Response(JSON.stringify({ error: 'ai_consent_required' }), {
+    return aiConsentForbiddenResponse()
-      status: 403,
-      headers: { 'Content-Type': 'application/json' },
-    })
   }
   const userId = session.user.id
 

memento-note/app/api/ai/suggest-notebook/route.ts

@@ -1,7 +1,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { notebookSuggestionService } from '@/lib/ai/services/notebook-suggestion.service'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'
 
 export async function POST(req: NextRequest) {
@@ -13,7 +13,7 @@ export async function POST(req: NextRequest) {
     const userId = session.user.id
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const body = await req.json()

memento-note/app/api/ai/tags/route.ts

@@ -6,7 +6,7 @@ import { runLaneWithBillingUser, willUseByokForLane } from '@/lib/ai/provider-fo
 import { getSystemConfig } from '@/lib/config';
 import { z } from 'zod';
 import { checkEntitlementOrThrow, QuotaExceededError, QuotaServiceUnavailableError } from '@/lib/entitlements';
-import { hasUserAiConsent } from '@/lib/consent/server-consent';
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent';
 
 import { getAISettings } from '@/app/actions/ai-settings';
 
@@ -25,7 +25,7 @@ export async function POST(req: NextRequest) {
 
     // GDPR AI Consent check
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 });
+      return aiConsentForbiddenResponse();
     }
 
     const userSettings = await getAISettings(session.user.id);

memento-note/app/api/ai/title-suggestions/route.ts

@@ -7,7 +7,7 @@ import { getAISettings } from '@/app/actions/ai-settings'
 import { reserveAiUsageOrThrow } from '@/lib/ai-quota'
 import { QuotaExceededError, QuotaServiceUnavailableError } from '@/lib/entitlements'
 import { z } from 'zod'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 
 const requestSchema = z.object({
   content: z.string().min(1, "Le contenu ne peut pas être vide"),
@@ -37,7 +37,7 @@ export async function POST(req: NextRequest) {
 
     // GDPR AI Consent check
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const settings = await getAISettings(session.user.id)

memento-note/app/api/ai/transform-markdown/route.ts

@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { getChatProvider } from '@/lib/ai/factory'
 import { getSystemConfig } from '@/lib/config'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'
 
 export async function POST(request: NextRequest) {
@@ -14,7 +14,7 @@ export async function POST(request: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const { text } = await request.json()

memento-note/app/api/ai/translate/route.ts

@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
 import { getTagsProvider } from '@/lib/ai/factory'
 import { getSystemConfig } from '@/lib/config'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
 
 export async function POST(request: NextRequest) {
@@ -13,7 +13,7 @@ export async function POST(request: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const { text, targetLanguage } = await request.json()

memento-note/app/api/chat/route.ts

@@ -6,7 +6,7 @@ import { getChatProvider } from '@/lib/ai/factory'
 import { semanticSearchService } from '@/lib/ai/services/semantic-search.service'
 import { prisma } from '@/lib/prisma'
 import { auth } from '@/auth'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { loadTranslations, getTranslationValue, SupportedLanguage } from '@/lib/i18n'
 import { toolRegistry } from '@/lib/ai/tools'
 import { reserveAiUsageOrThrow, handleQuotaHttpError } from '@/lib/ai-quota'
@@ -65,10 +65,7 @@ export async function POST(req: Request) {
 
   // GDPR AI Consent check
   if (!(await hasUserAiConsent())) {
-    return new Response(JSON.stringify({ error: 'ai_consent_required' }), {
+    return aiConsentForbiddenResponse()
-      status: 403,
-      headers: { 'Content-Type': 'application/json' },
-    })
   }
 
   // 1.5 Quota check (per-provider BYOK bypass — only when BYOK will be used for resolved provider)

memento-note/app/api/flashcards/generate/route.ts

@@ -3,7 +3,7 @@ import { auth } from '@/auth'
 import prisma from '@/lib/prisma'
 import { getAISettings } from '@/app/actions/ai-settings'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { generateFlashcardsFromNote, type FlashcardStyle } from '@/lib/flashcards/generate-flashcards'
 import { stripHtmlToText } from '@/lib/flashcards/deck-utils'
 
@@ -15,7 +15,7 @@ export async function POST(request: NextRequest) {
     }
 
     if (!(await hasUserAiConsent())) {
-      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+      return aiConsentForbiddenResponse()
     }
 
     const userSettings = await getAISettings(session.user.id)

memento-note/app/api/notes/publish/route.ts

@@ -4,7 +4,7 @@ import prisma from '@/lib/prisma'
 import { contentModerationService, type ModerationResult } from '@/lib/ai/services/content-moderation.service'
 import { publishEnhanceService } from '@/lib/ai/services/publish-enhance.service'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
-import { hasUserAiConsent } from '@/lib/consent/server-consent'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 import { isPublishTemplateId } from '@/lib/publish/types'
 import { computePublishedSourceHash, renderPublishedTemplate, renderRewrittenTemplate } from '@/lib/publish/template-render'
 
@@ -115,7 +115,7 @@ export async function POST(request: NextRequest) {
 
     if (publishMode === 'ai') {
       if (!(await hasUserAiConsent())) {
-        return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+        return aiConsentForbiddenResponse()
       }
       if (!template || !isPublishTemplateId(template)) {
         return NextResponse.json({ error: 'Invalid template' }, { status: 400 })

memento-note/components/agents/agent-card.tsx

@@ -128,7 +128,7 @@ export function AgentCard({ agent, onEdit, onRefresh, onToggle }: AgentCardProps
             if (pollRef.current) clearInterval(pollRef.current)
             pollRef.current = null
             setIsRunning(false)
-            toast.error(t('agents.toasts.runError', { error: data.error || t('agents.toasts.runFailed') }), { 
+            toast.error(t('agents.toasts.runError', { error: data.errorKey ? t(data.errorKey) : (data.error || t('agents.toasts.runFailed')) }), { 
               id: toastId,
               description: '' // Clear the loading description
             })

memento-note/components/auto-label-suggestion-dialog.tsx

@@ -122,7 +122,7 @@ export function AutoLabelSuggestionDialog({
         onLabelsCreated()
         onOpenChange(false)
       } else {
-        toast.error(data.error || t('ai.autoLabels.error'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('ai.autoLabels.error')))
       }
     } catch (error) {
       console.error('Failed to create labels:', error)

memento-note/components/batch-organization-dialog.tsx

@@ -149,7 +149,7 @@ export function BatchOrganizationDialog({
         onNotesMoved()
         onOpenChange(false)
       } else {
-        toast.error(data.error || t('ai.batchOrganization.applyFailed'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('ai.batchOrganization.applyFailed')))
       }
     } catch (error) {
       console.error('Failed to apply organization plan:', error)

memento-note/components/contextual-ai-chat.tsx

@@ -345,7 +345,7 @@ export function ContextualAIChat({
           return
         }
         const data = await res.json()
-        if (!res.ok) throw new Error(data.error || t('ai.genericError'))
+        if (!res.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('ai.genericError')))
         const descs = data.descriptions || []
         let resultText = descs.map((d: any) =>
           noteImages.length > 1 ? `**Image ${d.index + 1}:** ${d.description}` : d.description
@@ -381,7 +381,7 @@ export function ContextualAIChat({
         return
       }
       const data = await res.json()
-      if (!res.ok) throw new Error(data.error || t('ai.genericError'))
+      if (!res.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('ai.genericError')))
       const result = data[action.resultKey] || ''
       setActionPreview({ label: t(action.i18nKey), text: result, asRichText: action.id === 'toRichText' })
     } catch (e: any) {
@@ -457,7 +457,7 @@ export function ContextualAIChat({
       })
       const data = await res.json()
       if (!res.ok || !data.success) {
-        mToast.error(data.error || t('ai.errorShort'), { id: toastId })
+        mToast.error(data.errorKey ? t(data.errorKey) : (data.error || t('ai.errorShort')), { id: toastId })
         setGenerateLoading(null)
         return
       }
@@ -577,7 +577,7 @@ export function ContextualAIChat({
         }),
       })
       const data = await res.json()
-      if (!res.ok) throw new Error(data.error || t('ai.resource.enrichError'))
+      if (!res.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('ai.resource.enrichError')))
       setResourcePreview({ text: data.enrichedContent, source: resourceMode })
     } catch (e: any) {
       mToast.error(e.message || t('ai.resource.enrichError'))
@@ -622,7 +622,7 @@ export function ContextualAIChat({
         }),
       })
       const data = await res.json()
-      if (!res.ok) throw new Error(data.error || t('ai.genericError'))
+      if (!res.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('ai.genericError')))
       setResourcePreview({ text: data.enrichedContent, source: mode })
     } catch (e: any) {
       mToast.error(e.message || t('ai.resource.enrichErrorShort'))

memento-note/components/dashboard-view.tsx

@@ -519,7 +519,7 @@ export function DashboardView({ onNoteSelect }: DashboardViewProps) {
     try {
       const res = await fetch('/api/ai/echo')
       const json = await res.json()
-      if (res.status === 403 && json.error === 'ai_consent_required') { await requestAiConsent(); return }
+      if (res.status === 403 && json.code === 'ai_consent_required') { await requestAiConsent(); return }
       if (!res.ok) throw new Error(json.error)
       if (json.insight) {
         await reloadBriefingAndPaths()

memento-note/components/flashcards/flashcard-generate-dialog.tsx

@@ -64,11 +64,7 @@ export function FlashcardGenerateDialog({
       })
       const data = await res.json()
       if (!res.ok) {
-        if (data.errorKey) {
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('flashcards.generateFailed')))
-          toast.error(t(data.errorKey) || data.error)
-        } else {
-          toast.error(data.error || t('flashcards.generateFailed'))
-        }
         return
       }
       setCards(data.cards || [])

memento-note/components/flashcards/revision-view.tsx

@@ -353,7 +353,7 @@ export function RevisionView() {
       const res = await fetch(`/api/flashcards/decks/${deckId}`)
       const data = await res.json()
       if (!res.ok) {
-        toast.error(data.error || t('flashcards.loadDeckFailed'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('flashcards.loadDeckFailed')))
         return
       }
       setActiveDeckId(deckId)
@@ -432,7 +432,7 @@ export function RevisionView() {
       const res = await fetch(`/api/flashcards/decks/${deckId}`)
       const data = await res.json()
       if (!res.ok) {
-        toast.error(data.error || t('flashcards.loadDeckFailed'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('flashcards.loadDeckFailed')))
         setExpandedDeckId(null)
         return
       }

memento-note/components/fusion-modal.tsx

@@ -69,7 +69,7 @@ export function FusionModal({
       const data = await res.json()
       
       if (!res.ok) {
-        throw new Error(data.error || 'Failed to generate fusion')
+        throw new Error(data.errorKey ? t(data.errorKey) : (data.error || 'Failed to generate fusion'))
       }
 
       if (!data.fusedNote) {

memento-note/components/home-client.tsx

@@ -20,7 +20,7 @@ import {
 
 import { NotebookSuggestionToast } from '@/components/notebook-suggestion-toast'
 import { Button } from '@/components/ui/button'
-import { Plus, ArrowUpDown, Search, Sparkles, FileText, FolderOpen, ChevronRight, ChevronDown, Tag as TagIcon, X, Menu, LayoutGrid, List, Table, Columns3, CalendarDays, Wand2, Download, Upload, Globe } from 'lucide-react'
+import { Plus, ArrowUpDown, Search, Sparkles, FileText, FolderOpen, ChevronRight, ChevronDown, Tag as TagIcon, X, Menu, LayoutGrid, List, Table, Columns3, CalendarDays, Wand2, Download, Upload, Globe, Presentation } from 'lucide-react'
 import { emitNoteChange, NOTE_CHANGE_EVENT, type NoteChangeEvent } from '@/lib/note-change-sync'
 import { useReminderCheck } from '@/hooks/use-reminder-check'
 import { useAutoLabelSuggestion } from '@/hooks/use-auto-label-suggestion'
@@ -67,6 +67,10 @@ const NotebookSiteDialog = dynamic(
   () => import('@/components/wizard/notebook-site-dialog').then(m => ({ default: m.NotebookSiteDialog })),
   { ssr: false }
 )
+const NotebookSlidesDialog = dynamic(
+  () => import('@/components/wizard/notebook-slides-dialog').then(m => ({ default: m.NotebookSlidesDialog })),
+  { ssr: false }
+)
 const StructuredViewsIntro = dynamic(
   () => import('@/components/structured-views/structured-views-intro').then(m => ({ default: m.StructuredViewsIntro })),
   { ssr: false }
@@ -151,6 +155,7 @@ export function HomeClient({
   const [isEnablingStructured, setIsEnablingStructured] = useState(false)
   const [showStructuredWizard, setShowStructuredWizard] = useState(false)
   const [showNotebookSite, setShowNotebookSite] = useState(false)
+  const [showNotebookSlides, setShowNotebookSlides] = useState(false)
   const [aiMenuOpen, setAiMenuOpen] = useState(false)
   const aiMenuRef = useRef<HTMLDivElement>(null)
   const [showStudyPlanner, setShowStudyPlanner] = useState(false)
@@ -179,7 +184,7 @@ export function HomeClient({
         toast.success(`${data.created} notes importées !`)
         window.location.reload()
       } else {
-        toast.error(data.error || 'Erreur')
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || 'Erreur'))
       }
     }
     input.click()
@@ -1136,6 +1141,11 @@ export function HomeClient({
                               label: t('notebookSite.shortTitle') || 'Site web',
                               action: () => { setShowNotebookSite(true); setAiMenuOpen(false) },
                             },
+                            {
+                              icon: <Presentation size={14} />,
+                              label: t('notebook.slides') || 'Présentation',
+                              action: () => { setShowNotebookSlides(true); setAiMenuOpen(false) },
+                            },
                           ].map((item, i) => (
                             <button
                               key={i}
@@ -1452,6 +1462,14 @@ export function HomeClient({
           onClose={() => setShowNotebookSite(false)}
         />
       )}
+
+      {showNotebookSlides && currentNotebook && (
+        <NotebookSlidesDialog
+          notebookId={currentNotebook.id}
+          notebookName={currentNotebook.name}
+          onClose={() => setShowNotebookSlides(false)}
+        />
+      )}
     </div>
   )
 }

memento-note/components/note-editor/note-editor-context.tsx

@@ -426,7 +426,7 @@ export function NoteEditorProvider({ note, readOnly = false, fullPage = false, o
           return
         }
         const errorData = await response.json()
-        throw new Error(errorData.error || t('ai.titleGenerationError'))
+        throw new Error(errorData.errorKey ? t(errorData.errorKey) : (errorData.error || t('ai.titleGenerationError')))
       }
 
       const data = await response.json()
@@ -502,7 +502,7 @@ export function NoteEditorProvider({ note, readOnly = false, fullPage = false, o
           return
         }
         const errorData = await response.json()
-        throw new Error(errorData.error || t('ai.reformulationError'))
+        throw new Error(errorData.errorKey ? t(errorData.errorKey) : (errorData.error || t('ai.reformulationError')))
       }
 
       const data = await response.json()
@@ -542,7 +542,7 @@ export function NoteEditorProvider({ note, readOnly = false, fullPage = false, o
         return
       }
       const data = await response.json()
-      if (!response.ok) throw new Error(data.error || t('notes.clarifyFailed'))
+      if (!response.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('notes.clarifyFailed')))
       setContentImmediate(data.reformulatedText || data.text)
       toast.success(t('ai.reformulationApplied'))
     } catch (error) {
@@ -575,7 +575,7 @@ export function NoteEditorProvider({ note, readOnly = false, fullPage = false, o
         return
       }
       const data = await response.json()
-      if (!response.ok) throw new Error(data.error || t('notes.shortenFailed'))
+      if (!response.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('notes.shortenFailed')))
       setContentImmediate(data.reformulatedText || data.text)
       toast.success(t('ai.reformulationApplied'))
     } catch (error) {
@@ -608,7 +608,7 @@ export function NoteEditorProvider({ note, readOnly = false, fullPage = false, o
         return
       }
       const data = await response.json()
-      if (!response.ok) throw new Error(data.error || t('notes.improveFailed'))
+      if (!response.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('notes.improveFailed')))
       setContentImmediate(data.reformulatedText || data.text)
       toast.success(t('ai.reformulationApplied'))
     } catch (error) {
@@ -642,7 +642,7 @@ export function NoteEditorProvider({ note, readOnly = false, fullPage = false, o
         body: JSON.stringify({ text: content })
       })
       const data = await response.json()
-      if (!response.ok) throw new Error(data.error || t('notes.transformFailed'))
+      if (!response.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('notes.transformFailed')))
 
       setContentImmediate(data.transformedText)
       setIsMarkdown(true)

memento-note/components/note-editor/note-editor-toolbar.tsx

@@ -330,7 +330,7 @@ export function NoteEditorToolbar({ mode, onClose, onToggleAttachments, attachme
           duration: 6000,
         })
       } else {
-        toast.error(data.error || t('general.error'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('general.error')))
       }
     } catch {
       toast.error(t('general.error'))
@@ -408,7 +408,7 @@ export function NoteEditorToolbar({ mode, onClose, onToggleAttachments, attachme
         })
       } else {
         toast.dismiss(toastId)
-        toast.error(data.error || t('general.error'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('general.error')))
       }
     } catch {
       toast.dismiss(toastId)
@@ -437,7 +437,7 @@ export function NoteEditorToolbar({ mode, onClose, onToggleAttachments, attachme
         setPublishOpen(false)
       } else {
         const data = await res.json().catch(() => ({}))
-        toast.error(data.error || t('general.error'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('general.error')))
       }
     } catch {
       toast.error(t('general.error'))

memento-note/components/note-editor/publish-dialog.tsx

@@ -46,7 +46,7 @@ export function PublishDialog({ open, onClose, noteId, noteTitle, isPublic: init
           duration: 6000,
         })
       } else {
-        toast.error(data.error || 'Erreur')
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || 'Erreur'))
       }
     } catch { toast.error('Erreur') }
     finally { setLoading(false) }

memento-note/components/notebook-summary-dialog.tsx

@@ -68,7 +68,7 @@ export function NotebookSummaryDialog({
       if (data.success && data.data) {
         setSummary(data.data)
       } else {
-        toast.error(data.error || t('notebook.summaryError'))
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || t('notebook.summaryError')))
         onOpenChange(false)
       }
     } catch (error) {

memento-note/components/personas-panel.tsx

@@ -124,7 +124,7 @@ export function PersonasPanel({ noteTitle, noteContent }: PersonasPanelProps) {
         body: JSON.stringify({ content: noteContent, title: noteTitle, personaId }),
       })
       const data = await res.json()
-      if (!res.ok) throw new Error(data.error || t('common.error'))
+      if (!res.ok) throw new Error(data.errorKey ? t(data.errorKey) : (data.error || t('common.error')))
       setResults(prev => new Map(prev).set(personaId, data))
       setExpanded(personaId)
     } catch {

memento-note/components/rich-text-editor.tsx

@@ -2005,7 +2005,7 @@ function SlashCommandMenu({ editor, onInsertImage, onSuggestCharts }: { editor:
         }),
       })
       const data = await res.json()
-      if (!res.ok) { toast.error(data.error || 'Erreur'); return }
+      if (!res.ok) { toast.error(data.errorKey ? t(data.errorKey) : (data.error || 'Erreur')); return }
       let html = data.reformulatedText || data.text || ''
       // Clean up excessive whitespace
       html = html

memento-note/components/wizard/ai-notebook-wizard.tsx

@@ -100,7 +100,7 @@ export function AiNotebookWizard({ onClose, onComplete }: { onClose: () => void;
         } else if (data.errorKey === 'ai.quotaExceeded') {
           toast.error(t('ai.quotaExceeded') || 'Quota IA dépassé')
         } else {
-          toast.error(data.error || 'Erreur')
+          toast.error(data.errorKey ? t(data.errorKey) : (data.error || 'Erreur'))
         }
         setLoading(false)
         return

memento-note/components/wizard/notebook-site-dialog.tsx

@@ -100,7 +100,7 @@ export function NotebookSiteDialog({ notebookId, notebookName, onClose }: Notebo
         body: JSON.stringify({ selectedNoteIds: selected, template, description }),
       })
       const data = await res.json()
-      if (!res.ok) { toast.error(data.error || 'Erreur'); setStep('selection'); return }
+      if (!res.ok) { toast.error(data.errorKey ? t(data.errorKey) : (data.error || 'Erreur')); setStep('selection'); return }
       setExistingSlug(data.slug)
       setSiteUrl(data.url)
       setStep('done')

memento-note/components/wizard/notebook-slides-dialog.tsx

@@ -0,0 +1,237 @@
+'use client'
+
+import { useState, useEffect, useRef } from 'react'
+import { Presentation, X } from 'lucide-react'
+import { useLanguage } from '@/lib/i18n'
+import { toast } from 'sonner'
+import { useRouter } from 'next/navigation'
+
+const THEMES = [
+  'auto',
+  'Architectural SaaS',
+  'Midnight Cathedral',
+  'Aurora Borealis',
+  'Tokyo Neon',
+  'Sunlit Gallery',
+  'Clinical Precision',
+  'Venture Pitch',
+  'Forest Floor',
+  'Steel & Glass',
+  'Cyberpunk Terminal',
+  'Editorial Ink',
+  'Coastal Morning',
+  'Paper Studio',
+]
+
+const PURPOSES = [
+  { value: 'auto', key: 'ai.generate.purposeAuto' },
+  { value: 'course', key: 'ai.generate.purposeCourse' },
+  { value: 'board', key: 'ai.generate.purposeBoard' },
+  { value: 'project', key: 'ai.generate.purposeProject' },
+  { value: 'strategy', key: 'ai.generate.purposeStrategy' },
+  { value: 'pitch', key: 'ai.generate.purposePitch' },
+  { value: 'summary', key: 'ai.generate.purposeSummary' },
+]
+
+const STATUS_KEYS = [
+  'notebook.slidesStatus1',
+  'notebook.slidesStatus2',
+  'notebook.slidesStatus3',
+  'notebook.slidesStatus4',
+]
+
+export function NotebookSlidesDialog({
+  notebookId,
+  notebookName,
+  onClose,
+}: {
+  notebookId: string
+  notebookName: string
+  onClose: () => void
+}) {
+  const { t, language } = useLanguage()
+  const router = useRouter()
+  const [loading, setLoading] = useState(false)
+  const [theme, setTheme] = useState('auto')
+  const [purpose, setPurpose] = useState('auto')
+  const [progress, setProgress] = useState(0)
+  const timerRef = useRef<ReturnType<typeof setInterval>>(null)
+
+  useEffect(() => {
+    return () => {
+      if (timerRef.current) clearInterval(timerRef.current)
+    }
+  }, [])
+
+  const handleGenerate = async () => {
+    setLoading(true)
+    setProgress(0)
+
+    let elapsed = 0
+    timerRef.current = setInterval(() => {
+      elapsed += 0.6
+      setProgress(() => {
+        const target = 85 * (1 - Math.exp(-elapsed / 15))
+        return Math.min(target, 85)
+      })
+    }, 600)
+
+    try {
+      const res = await fetch('/api/ai/notebook-slides', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          notebookId,
+          theme,
+          purpose,
+          language: language === 'fr' ? 'fr' : 'en',
+        }),
+      })
+      const data = await res.json()
+
+      if (timerRef.current) clearInterval(timerRef.current)
+      setProgress(100)
+
+      if (!res.ok) {
+        toast.error(
+          data.errorKey === 'ai.featureLocked'
+            ? (t('ai.featureLocked') || 'Plan requis')
+            : (data.error || 'Erreur'),
+        )
+      } else if (data.success && data.canvasId) {
+        window.dispatchEvent(new Event('ai-usage-changed'))
+        toast.success(t('notebook.slidesReady') || `Présentation générée (${data.slideCount} slides)`)
+        setTimeout(() => {
+          router.push(`/lab?canvas=${data.canvasId}`)
+          onClose()
+        }, 400)
+      } else {
+        toast.error(data.errorKey ? t(data.errorKey) : (data.error || 'Erreur lors de la génération'))
+      }
+    } catch (e: any) {
+      if (timerRef.current) clearInterval(timerRef.current)
+      toast.error(e.message || 'Erreur')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  const statusIdx = Math.min(Math.floor(progress / 22), STATUS_KEYS.length - 1)
+
+  return (
+    <div
+      className="fixed inset-0 z-[300] flex items-center justify-center p-4 bg-black/50 backdrop-blur-sm"
+      dir="auto"
+      onClick={loading ? undefined : onClose}
+    >
+      <div
+        className="w-full max-w-lg rounded-2xl border border-border bg-card shadow-2xl overflow-hidden flex flex-col"
+        onClick={(e) => e.stopPropagation()}
+      >
+        <div className="flex items-center justify-between px-6 py-4 border-b border-border/50 bg-brand-accent/5 shrink-0">
+          <div className="flex items-center gap-2">
+            <Presentation className="h-5 w-5 text-brand-accent" />
+            <h2 className="text-base font-semibold">
+              {t('notebook.slides') || 'Présentation'}
+            </h2>
+          </div>
+          <button
+            onClick={onClose}
+            disabled={loading}
+            className="p-1 rounded-lg hover:bg-muted text-muted-foreground disabled:opacity-30 disabled:cursor-not-allowed"
+          >
+            <X className="h-5 w-5" />
+          </button>
+        </div>
+
+        <div className="p-6 space-y-5">
+          {!loading && (
+            <>
+              <p className="text-sm text-muted-foreground">
+                {t('notebook.slidesDescription') || `Génère une présentation à partir des notes du carnet « ${notebookName} ».`}
+              </p>
+
+              <div className="space-y-1.5">
+                <span className="text-[10px] uppercase tracking-[0.2em] font-bold text-muted-foreground px-1">
+                  {t('ai.generate.theme') || 'Thème'}
+                </span>
+                <select
+                  value={theme}
+                  onChange={(e) => setTheme(e.target.value)}
+                  className="w-full bg-card/60 border border-border rounded-lg px-3 py-2 text-sm outline-none focus:ring-1 ring-brand-accent/10 transition-all cursor-pointer text-foreground"
+                >
+                  {THEMES.map((th) => (
+                    <option key={th} value={th}>
+                      {th === 'auto' ? (t('ai.generate.themeAuto') || 'Auto') : th}
+                    </option>
+                  ))}
+                </select>
+              </div>
+
+              <div className="space-y-1.5">
+                <span className="text-[10px] uppercase tracking-[0.2em] font-bold text-muted-foreground px-1">
+                  {t('ai.generate.purpose') || 'Type de deck'}
+                </span>
+                <select
+                  value={purpose}
+                  onChange={(e) => setPurpose(e.target.value)}
+                  className="w-full bg-card/60 border border-border rounded-lg px-3 py-2 text-sm outline-none focus:ring-1 ring-brand-accent/10 transition-all cursor-pointer text-foreground"
+                >
+                  {PURPOSES.map((p) => (
+                    <option key={p.value} value={p.value}>
+                      {t(p.key) || p.value}
+                    </option>
+                  ))}
+                </select>
+              </div>
+
+              <button
+                onClick={handleGenerate}
+                className="w-full flex items-center justify-center gap-2 px-4 py-3 text-sm rounded-lg bg-brand-accent text-white hover:bg-brand-accent/90 transition-colors font-medium"
+              >
+                <Presentation className="h-4 w-4" />
+                {t('notebook.slidesGenerate') || 'Générer la présentation'}
+              </button>
+            </>
+          )}
+
+          {loading && (
+            <div className="space-y-5 py-4">
+              <div className="space-y-2">
+                <div className="w-full h-2.5 bg-muted rounded-full overflow-hidden">
+                  <div
+                    className="h-full bg-gradient-to-r from-brand-accent to-brand-accent/70 rounded-full transition-all duration-700 ease-out"
+                    style={{ width: `${progress}%` }}
+                  />
+                </div>
+                <div className="flex items-center justify-between">
+                  <span className="text-xs text-muted-foreground animate-pulse">
+                    {t(STATUS_KEYS[statusIdx])}
+                  </span>
+                  <span className="text-xs font-mono font-bold text-brand-accent tabular-nums">
+                    {Math.round(progress)}%
+                  </span>
+                </div>
+              </div>
+
+              <div className="flex items-center justify-between px-2">
+                {STATUS_KEYS.map((_, i) => (
+                  <div
+                    key={i}
+                    className={`h-1 flex-1 mx-0.5 rounded-full transition-colors duration-300 ${
+                      i <= statusIdx ? 'bg-brand-accent' : 'bg-muted'
+                    }`}
+                  />
+                ))}
+              </div>
+
+              <p className="text-[10px] text-muted-foreground/60 text-center">
+                {t('notebook.slidesGeneratingHint') || 'Outline + rédaction des slides'}
+              </p>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}

memento-note/lib/consent/server-consent.ts

@@ -25,6 +25,19 @@ export async function hasUserAiConsent(): Promise<boolean> {
   return settings?.aiProcessingConsent ?? false
 }
 
-export function aiConsentForbiddenResponse() {
+const DEFAULT_AI_CONSENT_MESSAGE = 'AI processing consent is required to use this feature.'
-  return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
+const AI_CONSENT_ERROR_KEY = 'consent.ai.requiredToast'
+
+export function aiConsentForbiddenResponse(message?: string) {
+  return NextResponse.json(
+    { error: message ?? DEFAULT_AI_CONSENT_MESSAGE, code: 'ai_consent_required', errorKey: AI_CONSENT_ERROR_KEY },
+    { status: 403 }
+  )
+}
+
+export function aiConsentForbiddenJson(message?: string) {
+  return NextResponse.json(
+    { success: false, error: message ?? DEFAULT_AI_CONSENT_MESSAGE, code: 'ai_consent_required', errorKey: AI_CONSENT_ERROR_KEY },
+    { status: 403 }
+  )
 }

memento-note/locales/en.json

@@ -3806,7 +3806,8 @@
       "revoked": "Consent not granted",
       "revokedToast": "AI processing consent successfully revoked.",
       "complianceBadge": "GDPR compliance",
-      "auditFailed": "Could not record your consent. Please try again."
+      "auditFailed": "Could not record your consent. Please try again.",
+      "requiredToast": "Enable AI processing in Settings → AI to use this feature."
     }
   },
   "account": {

memento-note/locales/fr.json

@@ -3812,7 +3812,8 @@
       "revoked": "Consentement non accordé",
       "revokedToast": "Consentement IA révoqué avec succès.",
       "complianceBadge": "Conformité RGPD",
-      "auditFailed": "Impossible d'enregistrer votre consentement. Réessayez."
+      "auditFailed": "Impossible d'enregistrer votre consentement. Réessayez.",
+      "requiredToast": "Activez le traitement IA dans Paramètres → IA pour utiliser cette fonctionnalité."
     }
   },
   "account": {