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/locales/en.json

@@ -2583,6 +2583,58 @@
     "structuredViewsImportCsv": "Import CSV file",
     "structuredViewsExportCsv": "Export as CSV",
     "structuredViewsOrganizer": "Organize",
+    "generalContinue": "Continue",
+    "structuredViewsTagApplied": "applied",
+    "wizard": {
+      "title": "Create a notebook with AI",
+      "chooseProfile": "What's your profile?",
+      "profileStudent": "Student",
+      "profileStudentDesc": "AI creates a structured course notebook with summaries, formulas and key takeaways",
+      "profileTeacher": "Teacher",
+      "profileTeacherDesc": "AI generates a course structure with chapters, exercises and learning objectives",
+      "profileEngineer": "Engineer / Professional",
+      "profileEngineerDesc": "AI creates organized technical documentation with specs and references",
+      "topicStudentPlaceholder": "e.g: Thermodynamics, Calculus, French Revolution...",
+      "topicTeacherPlaceholder": "e.g: Math 101, AP Physics, Algorithms...",
+      "topicEngineerPlaceholder": "e.g: Microservices architecture, Network security, ISO 27001...",
+      "topic": "Topic",
+      "level": "Level",
+      "levelBeginner": "Beginner",
+      "levelIntermediate": "Intermediate",
+      "levelAdvanced": "Advanced",
+      "levelExpert": "Expert",
+      "noteCount": "Number of notes",
+      "notes": "notes",
+      "confirmHint": "AI will create a notebook with rich notes: callouts, collapsible sections, math formulas, comparison columns, outlines and links.",
+      "generate": "Generate notebook",
+      "loading": "AI is creating your notebook with structured notes...",
+      "progressGenerating": "Generating content with AI...",
+      "progressCalling": "Calling AI...",
+      "progressParsing": "Parsing AI response...",
+      "progressCreating": "Creating notebook and notes...",
+      "success": "Notebook created successfully!",
+      "created": "Notebook created:",
+      "notesCreated": "notes created",
+      "openNotebook": "Open notebook",
+      "studyPlanner": "Study Plan",
+      "studyPlannerDesc": "AI creates a revision plan based on spaced repetition.",
+      "examDate": "Exam date",
+      "generatePlan": "Generate plan",
+      "studyPlanLoading": "Creating plan...",
+      "studyPlanSuccess": "Plan created! Reminders have been added to your notes.",
+      "daysPlanned": "days planned",
+      "studyPlanReminders": "Reminders have been automatically added to your notes.",
+      "organizer": "Organize with AI",
+      "organizerDesc": "AI analyzes your notes and suggests tags, groupings and duplicate detection.",
+      "analyze": "Analyze notebook",
+      "organizing": "Analyzing notes...",
+      "suggestedTags": "Suggested tags",
+      "categories": "Suggested groupings",
+      "duplicates": "Duplicates detected",
+      "apply": "Apply",
+      "tagApplied": "applied",
+      "noSuggestions": "No suggestions — notebook looks well organized."
+    },
     "wizardOrganizer": "Organize with AI",
     "wizardOrganizerDesc": "AI analyzes your notes and suggests tags, groupings and duplicate detection.",
     "wizardAnalyze": "Analyze notebook",