feat(flashcards): révision SM-2, génération IA et page /revision

Livre US-FLASHCARDS avec decks, session de révision, stats et migration Prisma. Finalise le Web Clipper (i18n 15 langues) et corrige les erreurs ESLint bloquant la CI.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/lib/flashcards/deck-utils.ts

@@ -0,0 +1,55 @@
+import prisma from '@/lib/prisma'
+
+export async function getOrCreateDeckForNotebook(params: {
+  userId: string
+  notebookId: string | null
+  notebookName?: string | null
+  manualName?: string
+}) {
+  const { userId, notebookId, notebookName, manualName } = params
+
+  if (notebookId) {
+    const existing = await prisma.flashcardDeck.findFirst({
+      where: { userId, notebookId },
+    })
+    if (existing) return existing
+
+    const notebook = await prisma.notebook.findFirst({
+      where: { id: notebookId, userId },
+      select: { name: true },
+    })
+    if (!notebook) {
+      throw new Error('Notebook not found')
+    }
+
+    return prisma.flashcardDeck.create({
+      data: {
+        userId,
+        notebookId,
+        name: notebook.name,
+      },
+    })
+  }
+
+  const name = (manualName || notebookName || 'Deck').trim().slice(0, 120)
+  if (!name) {
+    throw new Error('Deck name required')
+  }
+
+  return prisma.flashcardDeck.create({
+    data: {
+      userId,
+      name,
+    },
+  })
+}
+
+export function stripHtmlToText(html: string): string {
+  return html
+    .replace(/<script[\s\S]*?<\/script>/gi, ' ')
+    .replace(/<style[\s\S]*?<\/style>/gi, ' ')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/&nbsp;/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim()
+}