cleanup: audit complet — code mort supprimé, erreurs TS corrigées, i18n wizard ajouté

Supprimé:
- memento-note/memento-note/ (dossier fantôme, 7 erreurs TS)
- tiptap-subpage-extension.tsx + toutes ses références (feature retirée)

Corrigé:
- tiptap-columns-extension.tsx: PMNode import type → import value
- study-plan/route.ts: title null → string conversion
- csv/route.ts: paramètre implicit any

Ajouté:
- Section wizard.* complète (33 clés) dans fr.json + en.json
- generalContinue + structuredViewsTagApplied dans fr/en

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

@@ -33,7 +33,7 @@ export async function POST(request: NextRequest) {
       where: { notebookId, trashedAt: null, userId: session.user.id },
       select: { id: true, title: true },
       orderBy: { order: 'asc' },
-    })
+    }) as Array<{ id: string; title: string | null }>
 
     if (notes.length === 0) {
       return NextResponse.json({ error: 'No notes found in notebook' }, { status: 400 })
@@ -44,7 +44,8 @@ export async function POST(request: NextRequest) {
       select: { theme: true },
     })
 
-    const plan = await studyPlannerService.generate(notes, examDate)
+    const notesForService = notes.map(n => ({ id: n.id, title: n.title ?? '' }))
+    const plan = await studyPlannerService.generate(notesForService, examDate)
 
     // Set reminders on notes based on the plan
     for (const day of plan.days) {

memento-note/app/api/notebooks/csv/route.ts

@@ -121,7 +121,7 @@ export async function POST(request: NextRequest) {
 
     const headers = parseCSVLine(lines[0].replace(/^\uFEFF/, ''))
     const titleIdx = headers.findIndex(h => h.toLowerCase().includes('titre') || h.toLowerCase() === 'title')
-    const dataRows = lines.slice(1).filter(l => l.trim())
+    const dataRows = lines.slice(1).filter((l: string) => l.trim())
 
     // Get or create schema
     let schema = await prisma.notebookSchema.findUnique({ where: { notebookId } })