feat: publication IA (magazine/brief/essay) + fixes critique

Publication IA:
- 4 templates (magazine, brief, essay, simple) avec CSS riche
- Rewrite IA (article/exercises/tutorial/reference/mixed)
- Modération avec timeout 12s + fallback safe
- Quotas publish_enhance par tier (basic=2, pro=15, business=100)
- Détection contenu stale (hash)
- Migration DB publishedContent/publishedTemplate/publishedSourceHash

Fixes:
- cheerio v1.2: Element -> AnyNode (domhandler), decodeEntities cast
- _isShared ajouté au type Note (champ virtuel serveur)
- callout colors PDF export: extraction fonction pure testable
- admin/published: guard note.userId null
- Cmd+S fonctionne en mode dialog (pas seulement fullPage)

i18n:
- 23 clés publish* traduites dans les 15 locales
- Extension Web Clipper: 13 locales mise à jour

Tests:
- callout-colors.test.ts (6 tests)
- note-visible-in-view.test.ts (5 tests)
- entitlements.test.ts + byok-entitlements.test.ts: mock usageLog + unstubAllEnvs
- 199/199 tests passent

Tracker: user-stories.md sync avec sprint-status.yaml

memento-note/app/api/ai/study-plan/route.ts

@@ -3,6 +3,7 @@ import { auth } from '@/auth'
 import prisma from '@/lib/prisma'
 import { studyPlannerService } from '@/lib/ai/services/study-planner.service'
 import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'
+import { hasUserAiConsent, aiConsentForbiddenResponse } from '@/lib/consent/server-consent'
 
 export async function POST(request: NextRequest) {
   try {
@@ -16,6 +17,8 @@ export async function POST(request: NextRequest) {
       return NextResponse.json({ error: 'notebookId and examDate are required' }, { status: 400 })
     }
 
+    if (!(await hasUserAiConsent())) return aiConsentForbiddenResponse()
+
     try {
       await reserveUsageOrThrow(session.user.id, 'reformulate')
     } catch (err) {
@@ -41,15 +44,18 @@ export async function POST(request: NextRequest) {
 
     const userLang = await prisma.user.findUnique({
       where: { id: session.user.id },
-      select: { theme: true },
+      select: { language: true },
     })
 
     const notesForService = notes.map(n => ({ id: n.id, title: n.title ?? '' }))
-    const plan = await studyPlannerService.generate(notesForService, examDate)
+    const plan = await studyPlannerService.generate(notesForService, examDate, userLang?.language || 'fr')
 
-    // Set reminders on notes based on the plan
+    // Set the first occurrence reminder for each note (subsequent occurrences ignored)
+    const seenNoteIds = new Set<string>()
     for (const day of plan.days) {
       for (const noteId of day.noteIds) {
+        if (seenNoteIds.has(noteId)) continue
+        seenNoteIds.add(noteId)
         try {
           const reminderDate = new Date(day.date)
           reminderDate.setHours(9, 0, 0, 0)