feat: mobile app complet + flashcards fixes + drag handle améliorations

Mobile app:
- Révision flashcards : liste decks, session flip-card SM-2, couleurs harmonisées web
- Génération flashcards depuis note (FlashcardSheet + route /api/mobile/flashcards/generate)
- Audio Whisper : hook useAudioRecorder reécrit, MicButton avec erreurs
- IA : AISheet (améliorer/clarifier/résumer), TitleSheet (titre automatique)
- Suppression note (soft delete + confirmation Alert)
- Note du jour : titre lisible + HTML (plus JSON TipTap brut)
- Parser TipTap→HTML côté mobile (tipTapToHtml)
- Icône 🎓 dans header note → génération flashcards
- Endpoint flashcardGenerate dans config.ts

Web fixes:
- Bug flashcards groupées par carnet → deck par note (migration + schema)
- Bug filtre 'cartes dues' ignoré (suppression fallback buildSessionQueue)
- Suppression UI création deck manuelle (inutile)
- Fix setViewType is not defined dans home-client.tsx

Drag handle menu:
- Fix : clearNodes() avant transformation (heading→liste/code/citation)
- Ajout : option 'Texte' (paragraphe) dans Transformer en
- Ajout : Monter / Descendre le bloc
- Ajout : Copier le contenu du bloc
- Fix : sous-menu hover stable (délai 200ms)
- Fix : Supprimer en rouge via classe --danger (plus :first-child)
- i18n : nouvelles clés dans 15 locales

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

memento-mobile/package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "@react-native-async-storage/async-storage": "2.2.0",
         "expo": "~54.0.35",
+        "expo-av": "^16.0.8",
         "expo-constants": "~18.0.13",
         "expo-font": "~14.0.12",
         "expo-linking": "~8.0.12",
@@ -17,8 +18,8 @@
         "expo-secure-store": "~15.0.8",
         "expo-splash-screen": "~31.0.13",
         "expo-status-bar": "~3.0.9",
+        "expo-web-browser": "~14.1.6",
         "lucide-react-native": "^0.477.0",
-        "marked": "^18.0.4",
         "react": "19.1.0",
         "react-native": "0.81.5",
         "react-native-safe-area-context": "~5.6.0",
@@ -4769,6 +4770,23 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-av": {
+      "version": "16.0.8",
+      "resolved": "https://registry.npmjs.org/expo-av/-/expo-av-16.0.8.tgz",
+      "integrity": "sha512-cmVPftGR/ca7XBgs7R6ky36lF3OC0/MM/lpgX/yXqfv0jASTsh7AYX9JxHCwFmF+Z6JEB1vne9FDx4GiLcGreQ==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*",
+        "react": "*",
+        "react-native": "*",
+        "react-native-web": "*"
+      },
+      "peerDependenciesMeta": {
+        "react-native-web": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/expo-constants": {
       "version": "18.0.13",
       "resolved": "https://registry.npmjs.org/expo-constants/-/expo-constants-18.0.13.tgz",
@@ -4986,6 +5004,16 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-web-browser": {
+      "version": "14.1.6",
+      "resolved": "https://registry.npmjs.org/expo-web-browser/-/expo-web-browser-14.1.6.tgz",
+      "integrity": "sha512-/4P8eWqRyfXIMZna3acg320LXNA+P2cwyEVbjDX8vHnWU+UnOtyRKWy3XaAIyMPQ9hVjBNUQTh4MPvtnPRzakw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "expo": "*",
+        "react-native": "*"
+      }
+    },
     "node_modules/exponential-backoff": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/exponential-backoff/-/exponential-backoff-3.1.3.tgz",
@@ -6226,18 +6254,6 @@
         "tmpl": "1.0.5"
       }
     },
-    "node_modules/marked": {
-      "version": "18.0.4",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-18.0.4.tgz",
-      "integrity": "sha512-c/BTaKzg0G6ezQx97DAkYU7k0HM6ys0FqYeKBL6hlBByZwy+ycA1+f0vDdjMHKKeEjdgkx0GOv9Il6D+85cOqA==",
-      "license": "MIT",
-      "bin": {
-        "marked": "bin/marked.js"
-      },
-      "engines": {
-        "node": ">= 20"
-      }
-    },
     "node_modules/marky": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/marky/-/marky-1.3.0.tgz",