fix(extension): sync robuste content/sidepanel, diagnostic panel, preview propre v0.4.4

- content.js : écrit la sélection dans chrome.storage.session/local en plus du message runtime - sidepanel.js : lit le storage en fallback, loggue chaque étape, affiche un diagnostic panel - sidepanel.js : avertissement explicite si le content script n'est pas détecté - sidepanel.js : sépare le rendu Markdown du résumé et l'affichage texte brut de l'extrait - sidepanel.css : agrandit la zone de prévisualisation - i18n : nouvelles clés contentScriptMissing, diagnosticsTitle, copyDiagnostics - locales : correction FR (Retour, Enregistrement, Note, etc.) + version 0.4.4 partout - extract-article.ts : nettoie textContent des métadonnées (dates, temps de lecture, sources) - analyze/route.ts : excerpt propre via makeExcerpt - builds Chrome Store et Firefox regénérés en 0.4.4
2026-07-18 16:56:51 +00:00
parent bff060ad20
commit 0ee2afbd62
67 changed files with 1794 additions and 640 deletions
--- a/memento-note/app/api/clip/analyze/route.ts
+++ b/memento-note/app/api/clip/analyze/route.ts
@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { auth } from '@/auth'
-import { extractArticleFromHtml } from '@/lib/clip/extract-article'
+import { extractArticleFromHtml, makeExcerpt } from '@/lib/clip/extract-article'
 import { analyzeClipContent } from '@/lib/clip/analyze-clip'
 import { resolveClipLocale, wrapClipPlainParagraph } from '@/lib/clip/rtl-content'

@@ -92,7 +92,7 @@ export async function POST(request: NextRequest) {
      tags: analysis.tags,
      readingTime: analysis.readingTimeMinutes,
      content: contentHtml,
-      excerpt: textContent.slice(0, 500),
+      excerpt: makeExcerpt(textContent, 500),
    })
  } catch (error) {
    console.error('[POST /api/clip/analyze]', error)
--- a/memento-note/extension/_locales/ar/messages.json
+++ b/memento-note/extension/_locales/ar/messages.json
@@ -36,7 +36,7 @@
    "message": "الصق عنوان URL الخاص بـ HTTPS (أو LAN) لخادم Memento الخاص بك. تتعامل ملفات تعريف الارتباط الموجودة في هذا المتصفح مع تسجيل الدخول."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<الإصدار>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "لا يستطيع Memento الوصول إلى علامة التبويب هذه. تحقق من أذونات ملحق لوحة المفاتيح/الموقع — أو افتح اللوحة الجانبية."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "ملخص"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/de/messages.json
+++ b/memento-note/extension/_locales/de/messages.json
@@ -36,7 +36,7 @@
    "message": "Fügen Sie die HTTPS- (oder LAN-)URL Ihres Memento-Servers ein. Cookies in diesem Browser verarbeiten die Anmeldung."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento kann nicht auf diese Registerkarte zugreifen. Überprüfen Sie die Tastatur-/Site-Erweiterungsberechtigungen – oder öffnen Sie den Seitenbereich."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Zusammenfassung"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/en/messages.json
+++ b/memento-note/extension/_locales/en/messages.json
@@ -36,7 +36,7 @@
    "message": "Paste the HTTPS (or LAN) URL of your Memento server. Cookies in this browser handle sign-in."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento can't access this tab. Check keyboard/site extension permissions — or open the Side Panel."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Summary"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/es/messages.json
+++ b/memento-note/extension/_locales/es/messages.json
@@ -36,7 +36,7 @@
    "message": "Pegue la URL HTTPS (o LAN) de su servidor Memento. Las cookies en este navegador controlan el inicio de sesión."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIÓN>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento no puede acceder a esta pestaña. Verifique los permisos de extensión del sitio/teclado o abra el Panel lateral."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Resumen"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/fa/messages.json
+++ b/memento-note/extension/_locales/fa/messages.json
@@ -36,7 +36,7 @@
    "message": "URL HTTPS (یا LAN) سرور Memento خود را جایگذاری کنید. کوکی‌های این مرورگر ورود به سیستم را کنترل می‌کنند."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento نمی تواند به این برگه دسترسی پیدا کند. مجوزهای افزونه صفحه کلید/سایت را بررسی کنید - یا پانل جانبی را باز کنید."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "خلاصه"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/fr/messages.json
+++ b/memento-note/extension/_locales/fr/messages.json
@@ -36,13 +36,13 @@
    "message": "Collez l'URL HTTPS (ou LAN) de votre serveur Memento. Les cookies de ce navigateur gèrent la connexion."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento ne peut pas accéder à cet onglet. Vérifiez les autorisations du clavier/extension de site – ou ouvrez le panneau latéral."
  },
  "notebookUnnamed": {
-    "message": "Carnet sans titre"
+    "message": "Carnet sans nom"
  },
  "noNotebooks": {
    "message": "Pas encore de carnets"
@@ -63,7 +63,7 @@
    "message": "Sélection détectée"
  },
  "ignore": {
-    "message": "ignorer"
+    "message": "Ignorer"
  },
  "selectionHint": {
    "message": "Astuce : surlignez du texte sur la page pour clipper une sélection précise en note."
@@ -123,22 +123,22 @@
    "message": "Enregistrer dans Memento"
  },
  "back": {
-    "message": "Dos"
+    "message": "Retour"
  },
  "analyzingSource": {
    "message": "Analyse de la source"
  },
  "statusAnalyzing": {
-    "message": "Analyser…"
+    "message": "Analyse en cours…"
  },
  "statusSaving": {
-    "message": "Économie…"
+    "message": "Enregistrement…"
  },
  "processingDetail": {
    "message": "Génération automatique des tags, résumé sémantique et calcul des embeddings."
  },
  "noteSaved": {
-    "message": "Remarque enregistrée"
+    "message": "Note enregistrée"
  },
  "sentToNotebook": {
    "message": "Enregistré dans $NOTEBOOK$",
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Résumé"
+  },
+  "contentScriptMissing": {
+    "message": "Content script non détecté — rechargez la page pour clipper."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copier"
  }
 }
--- a/memento-note/extension/_locales/hi/messages.json
+++ b/memento-note/extension/_locales/hi/messages.json
@@ -36,7 +36,7 @@
    "message": "अपने मोमेंटो सर्वर का HTTPS (या LAN) URL चिपकाएँ। इस ब्राउज़र में कुकीज़ साइन-इन को संभालती हैं।"
  },
  "footerVersion": {
-    "message": "मोमेंटो वेब क्लिपर <<<संस्करण>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "मोमेंटो इस टैब तक नहीं पहुंच सकता. कीबोर्ड/साइट एक्सटेंशन अनुमतियां जांचें - या साइड पैनल खोलें।"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "सारांश"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/it/messages.json
+++ b/memento-note/extension/_locales/it/messages.json
@@ -36,7 +36,7 @@
    "message": "Incolla l'URL HTTPS (o LAN) del tuo server Memento. I cookie in questo browser gestiscono l'accesso."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIONE>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento non può accedere a questa scheda. Controlla le autorizzazioni per tastiera/estensione del sito oppure apri il pannello laterale."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Riepilogo"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/ja/messages.json
+++ b/memento-note/extension/_locales/ja/messages.json
@@ -36,7 +36,7 @@
    "message": "Memento サーバーの HTTPS (または LAN) URL を貼り付けます。このブラウザの Cookie がサインインを処理します。"
  },
  "footerVersion": {
-    "message": "Memento Web クリッパー <<<バージョン>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento はこのタブにアクセスできません。キーボード/サイト拡張機能の権限を確認するか、サイド パネルを開きます。"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "要約"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/ko/messages.json
+++ b/memento-note/extension/_locales/ko/messages.json
@@ -36,7 +36,7 @@
    "message": "Memento 서버의 HTTPS(또는 LAN) URL을 붙여넣습니다. 이 브라우저의 쿠키는 로그인을 처리합니다."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<버전>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento는 이 탭에 접근할 수 없습니다. 키보드/사이트 확장 권한을 확인하거나 측면 패널을 엽니다."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "요약"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/nl/messages.json
+++ b/memento-note/extension/_locales/nl/messages.json
@@ -36,7 +36,7 @@
    "message": "Plak de HTTPS (of LAN) URL van uw Memento-server. Cookies in deze browser zorgen voor het inloggen."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIE>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento heeft geen toegang tot dit tabblad. Controleer de rechten voor toetsenbord-/site-extensies — of open het zijpaneel."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Samenvatting"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/pl/messages.json
+++ b/memento-note/extension/_locales/pl/messages.json
@@ -36,7 +36,7 @@
    "message": "Wklej adres URL HTTPS (lub LAN) swojego serwera Memento. Pliki cookie w tej przeglądarce obsługują logowanie."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<WERSJA>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento nie ma dostępu do tej karty. Sprawdź uprawnienia rozszerzenia klawiatury/witryny — lub otwórz Panel boczny."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Streszczenie"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/pt/messages.json
+++ b/memento-note/extension/_locales/pt/messages.json
@@ -36,7 +36,7 @@
    "message": "Cole o URL HTTPS (ou LAN) do seu servidor Memento. Os cookies neste navegador controlam o login."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSÃO>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento não pode acessar esta guia. Verifique as permissões de extensão de teclado/site – ou abra o painel lateral."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Resumo"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/ru/messages.json
+++ b/memento-note/extension/_locales/ru/messages.json
@@ -36,7 +36,7 @@
    "message": "Вставьте URL-адрес HTTPS (или LAN) вашего сервера Memento. Файлы cookie в этом браузере обрабатывают вход в систему."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<ВЕРСИЯ>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento не имеет доступа к этой вкладке. Проверьте разрешения для расширения клавиатуры/сайта или откройте боковую панель."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Сводка"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/_locales/zh/messages.json
+++ b/memento-note/extension/_locales/zh/messages.json
@@ -36,7 +36,7 @@
    "message": "粘贴 Memento 服务器的 HTTPS（或 LAN）URL。此浏览器中的 Cookie 处理登录。"
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<版本>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento 无法访问此选项卡。检查键盘/站点扩展权限 - 或打开侧面板。"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "摘要"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/content.js
+++ b/memento-note/extension/content.js
@@ -1,6 +1,12 @@
 /**
 * Content script Momento — sélection live, surlignage, communication avec le side panel.
 * Injecté automatiquement sur http(s) ; ré-injecté à la demande si l’onglet était déjà ouvert.
+ *
+ * Architecture v0.4.4 :
+ * - La sélection courante est écrite dans chrome.storage.session/local comme source de vérité
+ *   (filet de sécurité si le runtime.sendMessage est perdu).
+ * - Les messages runtime servent de notification rapide au side panel.
+ * - SET_PICK_MODE répond toujours avec l’état pickMode + la sélection courante.
 */
 ;(function initMementoClipperContent() {
  if (globalThis.__mementoClipperContent) return
@@ -9,10 +15,16 @@
  const HIGHLIGHT_ID = 'memento-clipper-highlight-root'
  const BANNER_ID = 'memento-clipper-banner-root'
  const STYLE_ID = 'memento-clipper-styles'
+  const SESSION_KEY = 'memento_clipper_session'

  let pickMode = false
  let debounceTimer = null

+  function storageArea() {
+    // Firefox < 128 n’a pas storage.session en MV3 ; on fallback sur local.
+    return chrome.storage.session || chrome.storage.local
+  }
+
  function getSelectionText() {
    return window.getSelection()?.toString().trim() || ''
  }
@@ -36,10 +48,25 @@
    }
  }

+  async function writeSession(extra = {}) {
+    try {
+      await storageArea().set({
+        [SESSION_KEY]: {
+          ...getPageMeta(),
+          ...extra,
+          updatedAt: Date.now(),
+        },
+      })
+    } catch (err) {
+      console.debug('[memento] storage session write failed', err)
+    }
+  }
+
  function broadcastSelection() {
    clearTimeout(debounceTimer)
-    debounceTimer = setTimeout(() => {
+    debounceTimer = setTimeout(async () => {
      const payload = { type: 'SELECTION_CHANGED', ...getPageMeta() }
+      writeSession({ source: 'selection' })
      try {
        chrome.runtime.sendMessage(payload).catch(() => {})
      } catch {
@@ -189,7 +216,7 @@

  chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
    if (message?.type === 'PING') {
-      sendResponse({ ok: true })
+      sendResponse({ ok: true, pickMode, selection: getPageMeta() })
      return true
    }
    if (message?.type === 'GET_CONTEXT') {
@@ -201,11 +228,13 @@
    }
    if (message?.type === 'SET_PICK_MODE') {
      setPickMode(!!message.enabled)
-      sendResponse({ ok: true, pickMode })
+      sendResponse({ ok: true, pickMode, selection: getPageMeta() })
      return true
    }
    return false
  })

+  // Amorcer le storage dès l'injection (utile si une sélection existait avant l'ouverture du side panel).
+  writeSession({ source: 'init' })
  broadcastSelection()
 })()
--- a/memento-note/extension/dist-chrome-store/_locales/ar/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/ar/messages.json
@@ -36,7 +36,7 @@
    "message": "الصق عنوان URL الخاص بـ HTTPS (أو LAN) لخادم Memento الخاص بك. تتعامل ملفات تعريف الارتباط الموجودة في هذا المتصفح مع تسجيل الدخول."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<الإصدار>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "لا يستطيع Memento الوصول إلى علامة التبويب هذه. تحقق من أذونات ملحق لوحة المفاتيح/الموقع — أو افتح اللوحة الجانبية."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "ملخص"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/de/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/de/messages.json
@@ -36,7 +36,7 @@
    "message": "Fügen Sie die HTTPS- (oder LAN-)URL Ihres Memento-Servers ein. Cookies in diesem Browser verarbeiten die Anmeldung."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento kann nicht auf diese Registerkarte zugreifen. Überprüfen Sie die Tastatur-/Site-Erweiterungsberechtigungen – oder öffnen Sie den Seitenbereich."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Zusammenfassung"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/en/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/en/messages.json
@@ -36,7 +36,7 @@
    "message": "Paste the HTTPS (or LAN) URL of your Memento server. Cookies in this browser handle sign-in."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento can't access this tab. Check keyboard/site extension permissions — or open the Side Panel."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Summary"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/es/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/es/messages.json
@@ -36,7 +36,7 @@
    "message": "Pegue la URL HTTPS (o LAN) de su servidor Memento. Las cookies en este navegador controlan el inicio de sesión."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIÓN>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento no puede acceder a esta pestaña. Verifique los permisos de extensión del sitio/teclado o abra el Panel lateral."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Resumen"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/fa/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/fa/messages.json
@@ -36,7 +36,7 @@
    "message": "URL HTTPS (یا LAN) سرور Memento خود را جایگذاری کنید. کوکی‌های این مرورگر ورود به سیستم را کنترل می‌کنند."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento نمی تواند به این برگه دسترسی پیدا کند. مجوزهای افزونه صفحه کلید/سایت را بررسی کنید - یا پانل جانبی را باز کنید."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "خلاصه"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/fr/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/fr/messages.json
@@ -36,13 +36,13 @@
    "message": "Collez l'URL HTTPS (ou LAN) de votre serveur Memento. Les cookies de ce navigateur gèrent la connexion."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento ne peut pas accéder à cet onglet. Vérifiez les autorisations du clavier/extension de site – ou ouvrez le panneau latéral."
  },
  "notebookUnnamed": {
-    "message": "Carnet sans titre"
+    "message": "Carnet sans nom"
  },
  "noNotebooks": {
    "message": "Pas encore de carnets"
@@ -63,7 +63,7 @@
    "message": "Sélection détectée"
  },
  "ignore": {
-    "message": "ignorer"
+    "message": "Ignorer"
  },
  "selectionHint": {
    "message": "Astuce : surlignez du texte sur la page pour clipper une sélection précise en note."
@@ -123,22 +123,22 @@
    "message": "Enregistrer dans Memento"
  },
  "back": {
-    "message": "Dos"
+    "message": "Retour"
  },
  "analyzingSource": {
    "message": "Analyse de la source"
  },
  "statusAnalyzing": {
-    "message": "Analyser…"
+    "message": "Analyse en cours…"
  },
  "statusSaving": {
-    "message": "Économie…"
+    "message": "Enregistrement…"
  },
  "processingDetail": {
    "message": "Génération automatique des tags, résumé sémantique et calcul des embeddings."
  },
  "noteSaved": {
-    "message": "Remarque enregistrée"
+    "message": "Note enregistrée"
  },
  "sentToNotebook": {
    "message": "Enregistré dans $NOTEBOOK$",
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Résumé"
+  },
+  "contentScriptMissing": {
+    "message": "Content script non détecté — rechargez la page pour clipper."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copier"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/hi/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/hi/messages.json
@@ -36,7 +36,7 @@
    "message": "अपने मोमेंटो सर्वर का HTTPS (या LAN) URL चिपकाएँ। इस ब्राउज़र में कुकीज़ साइन-इन को संभालती हैं।"
  },
  "footerVersion": {
-    "message": "मोमेंटो वेब क्लिपर <<<संस्करण>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "मोमेंटो इस टैब तक नहीं पहुंच सकता. कीबोर्ड/साइट एक्सटेंशन अनुमतियां जांचें - या साइड पैनल खोलें।"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "सारांश"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/it/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/it/messages.json
@@ -36,7 +36,7 @@
    "message": "Incolla l'URL HTTPS (o LAN) del tuo server Memento. I cookie in questo browser gestiscono l'accesso."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIONE>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento non può accedere a questa scheda. Controlla le autorizzazioni per tastiera/estensione del sito oppure apri il pannello laterale."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Riepilogo"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/ja/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/ja/messages.json
@@ -36,7 +36,7 @@
    "message": "Memento サーバーの HTTPS (または LAN) URL を貼り付けます。このブラウザの Cookie がサインインを処理します。"
  },
  "footerVersion": {
-    "message": "Memento Web クリッパー <<<バージョン>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento はこのタブにアクセスできません。キーボード/サイト拡張機能の権限を確認するか、サイド パネルを開きます。"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "要約"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/ko/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/ko/messages.json
@@ -36,7 +36,7 @@
    "message": "Memento 서버의 HTTPS(또는 LAN) URL을 붙여넣습니다. 이 브라우저의 쿠키는 로그인을 처리합니다."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<버전>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento는 이 탭에 접근할 수 없습니다. 키보드/사이트 확장 권한을 확인하거나 측면 패널을 엽니다."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "요약"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/nl/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/nl/messages.json
@@ -36,7 +36,7 @@
    "message": "Plak de HTTPS (of LAN) URL van uw Memento-server. Cookies in deze browser zorgen voor het inloggen."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIE>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento heeft geen toegang tot dit tabblad. Controleer de rechten voor toetsenbord-/site-extensies — of open het zijpaneel."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Samenvatting"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/pl/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/pl/messages.json
@@ -36,7 +36,7 @@
    "message": "Wklej adres URL HTTPS (lub LAN) swojego serwera Memento. Pliki cookie w tej przeglądarce obsługują logowanie."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<WERSJA>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento nie ma dostępu do tej karty. Sprawdź uprawnienia rozszerzenia klawiatury/witryny — lub otwórz Panel boczny."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Streszczenie"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/pt/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/pt/messages.json
@@ -36,7 +36,7 @@
    "message": "Cole o URL HTTPS (ou LAN) do seu servidor Memento. Os cookies neste navegador controlam o login."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSÃO>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento não pode acessar esta guia. Verifique as permissões de extensão de teclado/site – ou abra o painel lateral."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Resumo"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/ru/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/ru/messages.json
@@ -36,7 +36,7 @@
    "message": "Вставьте URL-адрес HTTPS (или LAN) вашего сервера Memento. Файлы cookie в этом браузере обрабатывают вход в систему."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<ВЕРСИЯ>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento не имеет доступа к этой вкладке. Проверьте разрешения для расширения клавиатуры/сайта или откройте боковую панель."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Сводка"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/_locales/zh/messages.json
+++ b/memento-note/extension/dist-chrome-store/_locales/zh/messages.json
@@ -36,7 +36,7 @@
    "message": "粘贴 Memento 服务器的 HTTPS（或 LAN）URL。此浏览器中的 Cookie 处理登录。"
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<版本>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento 无法访问此选项卡。检查键盘/站点扩展权限 - 或打开侧面板。"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "摘要"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-chrome-store/content.js
+++ b/memento-note/extension/dist-chrome-store/content.js
@@ -1,6 +1,12 @@
 /**
 * Content script Momento — sélection live, surlignage, communication avec le side panel.
 * Injecté automatiquement sur http(s) ; ré-injecté à la demande si l’onglet était déjà ouvert.
+ *
+ * Architecture v0.4.4 :
+ * - La sélection courante est écrite dans chrome.storage.session/local comme source de vérité
+ *   (filet de sécurité si le runtime.sendMessage est perdu).
+ * - Les messages runtime servent de notification rapide au side panel.
+ * - SET_PICK_MODE répond toujours avec l’état pickMode + la sélection courante.
 */
 ;(function initMementoClipperContent() {
  if (globalThis.__mementoClipperContent) return
@@ -9,10 +15,16 @@
  const HIGHLIGHT_ID = 'memento-clipper-highlight-root'
  const BANNER_ID = 'memento-clipper-banner-root'
  const STYLE_ID = 'memento-clipper-styles'
+  const SESSION_KEY = 'memento_clipper_session'

  let pickMode = false
  let debounceTimer = null

+  function storageArea() {
+    // Firefox < 128 n’a pas storage.session en MV3 ; on fallback sur local.
+    return chrome.storage.session || chrome.storage.local
+  }
+
  function getSelectionText() {
    return window.getSelection()?.toString().trim() || ''
  }
@@ -36,10 +48,25 @@
    }
  }

+  async function writeSession(extra = {}) {
+    try {
+      await storageArea().set({
+        [SESSION_KEY]: {
+          ...getPageMeta(),
+          ...extra,
+          updatedAt: Date.now(),
+        },
+      })
+    } catch (err) {
+      console.debug('[memento] storage session write failed', err)
+    }
+  }
+
  function broadcastSelection() {
    clearTimeout(debounceTimer)
-    debounceTimer = setTimeout(() => {
+    debounceTimer = setTimeout(async () => {
      const payload = { type: 'SELECTION_CHANGED', ...getPageMeta() }
+      writeSession({ source: 'selection' })
      try {
        chrome.runtime.sendMessage(payload).catch(() => {})
      } catch {
@@ -189,7 +216,7 @@

  chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
    if (message?.type === 'PING') {
-      sendResponse({ ok: true })
+      sendResponse({ ok: true, pickMode, selection: getPageMeta() })
      return true
    }
    if (message?.type === 'GET_CONTEXT') {
@@ -201,11 +228,13 @@
    }
    if (message?.type === 'SET_PICK_MODE') {
      setPickMode(!!message.enabled)
-      sendResponse({ ok: true, pickMode })
+      sendResponse({ ok: true, pickMode, selection: getPageMeta() })
      return true
    }
    return false
  })

+  // Amorcer le storage dès l'injection (utile si une sélection existait avant l'ouverture du side panel).
+  writeSession({ source: 'init' })
  broadcastSelection()
 })()
--- a/memento-note/extension/dist-chrome-store/i18n.js
+++ b/memento-note/extension/dist-chrome-store/i18n.js
@@ -44,4 +44,13 @@ function applyShellI18n() {
  if (hint) hint.textContent = t('settingsHint')
  const footer = document.querySelector('.footer-meta')
  if (footer) footer.textContent = t('footerVersion')
+  if (typeof els !== 'undefined' && els.diagToggle) {
+    const diagTitle = t('diagnosticsTitle') || 'Diagnostic'
+    els.diagToggle.title = diagTitle
+    els.diagToggle.setAttribute('aria-label', diagTitle)
+  }
+  const diagTitleEl = document.querySelector('.diag-title')
+  if (diagTitleEl) diagTitleEl.textContent = t('diagnosticsTitle') || 'Diagnostic'
+  const copyDiagBtn = document.getElementById('copyDiagBtn')
+  if (copyDiagBtn) copyDiagBtn.textContent = t('copyDiagnostics') || 'Copier'
 }
--- a/memento-note/extension/dist-chrome-store/manifest.json
+++ b/memento-note/extension/dist-chrome-store/manifest.json
@@ -1,7 +1,7 @@
 {
  "manifest_version": 3,
  "name": "__MSG_extName__",
-  "version": "0.4.3",
+  "version": "0.4.4",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "permissions": [
--- a/memento-note/extension/dist-chrome-store/sidepanel.css
+++ b/memento-note/extension/dist-chrome-store/sidepanel.css
@@ -519,12 +519,23 @@ input[type="text"]:focus,
  overflow-wrap: anywhere;
 }
 .excerpt-block .preview-block-body {
-  min-height: 180px;
-  max-height: 360px;
+  min-height: 220px;
+  max-height: 520px;
  overflow-y: auto;
  background: #fcfbf9;
+  font-size: 14px;
+  line-height: 1.75;
+  padding: 16px 18px;
 }
+
+.excerpt-plain {
+  white-space: normal;
+}
+
 .summary-block .preview-block-body {
+  min-height: 120px;
+  max-height: 360px;
+  overflow-y: auto;
  font-style: normal;
  color: rgba(28, 28, 28, 0.78);
  background: rgba(2, 132, 199, 0.04);
@@ -639,6 +650,77 @@ html[dir="rtl"] .sub {
  .page-row .title { font-size: 14px; }
 }

+/* Avertissement content script */
+.cs-warning {
+  padding: 10px 12px;
+  border-radius: var(--radius-sm);
+  background: #fff7ed;
+  border: 1px solid #fdba74;
+  color: #9a3412;
+  font-size: 11px;
+  line-height: 1.5;
+  margin-bottom: 8px;
+}
+
+/* Panneau de diagnostic */
+.diag-panel {
+  border-top: 1px solid var(--border);
+  background: #1c1c1c;
+  color: #e5e5e5;
+  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
+  font-size: 10px;
+  line-height: 1.5;
+}
+.diag-panel[hidden] { display: none !important; }
+.diag-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 8px 12px;
+  background: #2a2a2a;
+}
+.diag-title {
+  font-weight: 700;
+  color: #a3a3a3;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+}
+.diag-copy {
+  background: transparent;
+  border: 1px solid #525252;
+  color: #d4d4d4;
+  border-radius: 6px;
+  padding: 4px 8px;
+  font-size: 10px;
+  cursor: pointer;
+}
+.diag-copy:hover { background: #404040; }
+.diag-body {
+  max-height: 160px;
+  overflow-y: auto;
+  padding: 8px 12px;
+}
+.diag-line {
+  padding: 2px 0;
+  border-bottom: 1px solid #333;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+.diag-line:last-child { border-bottom: none; }
+
+.diag-toggle {
+  background: none;
+  border: none;
+  color: var(--muted);
+  cursor: pointer;
+  padding: 4px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.diag-toggle:hover { color: var(--ink); }
+
 /* Très petits écrans (mobile debug, fenetres étirées) */
@media (max-width: 320px) {
  .brand-text { display: none; }
--- a/memento-note/extension/dist-chrome-store/sidepanel.html
+++ b/memento-note/extension/dist-chrome-store/sidepanel.html
@@ -24,6 +24,9 @@
          <span class="conn-dot"></span>
          <span id="connLabel"></span>
        </div>
+        <button type="button" id="diagToggle" class="diag-toggle" title="Diagnostic" aria-label="Diagnostic" aria-expanded="false">
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M12 22c5.523 0 10-4.477 10-10S17.523 2 12 2 2 6.477 2 12s4.477 10 10 10z"/><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"/><line x1="12" y1="17" x2="12.01" y2="17"/></svg>
+        </button>
        <button type="button" id="settingsBtn" class="icon-btn" title="" aria-label="">
          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="3"/><path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/></svg>
        </button>
@@ -53,6 +56,14 @@
    <footer class="footer">
      <span class="footer-meta"></span>
    </footer>
+
+    <div id="diagPanel" class="diag-panel" hidden>
+      <div class="diag-head">
+        <span class="diag-title">Diagnostic</span>
+        <button type="button" id="copyDiagBtn" class="diag-copy">Copier</button>
+      </div>
+      <div id="diagBody" class="diag-body"></div>
+    </div>
  </div>
  <script src="i18n.js"></script>
  <script src="sidepanel.js"></script>
--- a/memento-note/extension/dist-chrome-store/sidepanel.js
+++ b/memento-note/extension/dist-chrome-store/sidepanel.js
@@ -2,6 +2,7 @@
 const ALLOW_INSTANCE_CONFIG = false
 const DEFAULT_BASE = 'https://memento-note.com'
 const STORAGE_KEYS = { baseUrl: 'memento_clipper_base_url', notebookId: 'memento_clipper_notebook_id' }
+const SESSION_KEY = 'memento_clipper_session'

 let state = 'idle'
 let notebooks = []
@@ -25,6 +26,9 @@ let pendingClipType = 'page'
 let analyzeResult = null
 let editableTitle = ''
 let connected = false
+let contentScriptReady = false
+const diagLogs = []
+let diagOpen = false

 const els = {
  screen: document.getElementById('screen'),
@@ -36,6 +40,10 @@ const els = {
  settingsStatus: document.getElementById('settingsStatus'),
  applyInstanceBtn: document.getElementById('applyInstanceBtn'),
  openLoginBtn: document.getElementById('openLoginBtn'),
+  diagPanel: document.getElementById('diagPanel'),
+  diagToggle: document.getElementById('diagToggle'),
+  diagBody: document.getElementById('diagBody'),
+  copyDiagBtn: document.getElementById('copyDiagBtn'),
 }

 const ICON_SELECT =
@@ -71,6 +79,10 @@ function escapeHtml(s) {
    .replace(/"/g, '&quot;')
 }

+function escapePlainText(s) {
+  return escapeHtml(s).replace(/\n/g, '<br/>')
+}
+
 /**
 * Mini-renderer Markdown sûr pour le side panel.
 * - Échappe d'abord le texte (anti-XSS)
@@ -136,6 +148,38 @@ function rtlAttrs(text) {
  return ` class="text-rtl" dir="rtl"${lang}`
 }

+// ---------------------------------------------------------------------------
+// Diagnostic logging
+// ---------------------------------------------------------------------------
+
+function logDiag(label, detail = '') {
+  const line = `[${new Date().toLocaleTimeString()}] ${label}${detail ? ` — ${detail}` : ''}`
+  diagLogs.push(line)
+  if (diagLogs.length > 80) diagLogs.shift()
+  renderDiag()
+  console.debug('[memento-diag]', label, detail)
+}
+
+function renderDiag() {
+  if (!els.diagBody) return
+  els.diagBody.innerHTML = diagLogs.map((l) => `<div class="diag-line">${escapeHtml(l)}</div>`).join('')
+  els.diagBody.scrollTop = els.diagBody.scrollHeight
+}
+
+async function copyDiagnostics() {
+  try {
+    const text = diagLogs.join('\n')
+    await navigator.clipboard.writeText(text)
+    logDiag('diagnostics copied')
+  } catch (e) {
+    logDiag('copy failed', String(e))
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Notebooks
+// ---------------------------------------------------------------------------
+
 function sortNotebooksHierarchy(list) {
  const byParent = new Map()
  for (const n of list) {
@@ -189,29 +233,60 @@ async function getActiveTab() {
  return tab
 }

+// ---------------------------------------------------------------------------
+// Content script synchronization (v0.4.4)
+// ---------------------------------------------------------------------------
+
+function storageArea() {
+  return chrome.storage.session || chrome.storage.local
+}
+
 async function ensureContentScript(tabId) {
+  logDiag('ensureContentScript start', `tab=${tabId}`)
  try {
    const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
-    if (resp?.ok) return true
-  } catch {
-    /* inject */
+    if (resp?.ok) {
+      contentScriptReady = true
+      logDiag('PING ok', `pickMode=${resp.pickMode} sel=${resp.selection?.text?.length || 0}`)
+      if (resp.selection) applySelectionFromMessage(resp.selection, { fromPing: true })
+      return true
+    }
+  } catch (err) {
+    logDiag('PING failed', String(err?.message || err))
  }
  try {
    await chrome.scripting.executeScript({ target: { tabId }, files: ['content.js'] })
-    return true
-  } catch {
+    logDiag('content script injected')
+    // attendre un court instant que le script s'enregistre
+    await new Promise((r) => setTimeout(r, 120))
+    const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
+    contentScriptReady = resp?.ok || false
+    logDiag('PING after inject', `ok=${contentScriptReady}`)
+    return contentScriptReady
+  } catch (err) {
+    contentScriptReady = false
+    logDiag('content script inject failed', String(err?.message || err))
    return false
  }
 }

 async function setPickModeOnTab(enabled) {
-  if (!activeTabId || pageRestricted) return
+  if (!activeTabId || pageRestricted) {
+    logDiag('setPickMode skipped', `tab=${activeTabId} restricted=${pageRestricted}`)
+    return false
+  }
  const ok = await ensureContentScript(activeTabId)
-  if (!ok) return
+  if (!ok) return false
  try {
-    await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
-  } catch {
-    /* ignore */
+    const resp = await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
+    contentScriptReady = resp?.ok || false
+    logDiag('SET_PICK_MODE ok', `enabled=${enabled} pickMode=${resp?.pickMode}`)
+    if (resp?.selection) applySelectionFromMessage(resp.selection, { fromSetPickMode: true })
+    return contentScriptReady
+  } catch (err) {
+    contentScriptReady = false
+    logDiag('SET_PICK_MODE failed', String(err?.message || err))
+    return false
  }
 }

@@ -219,6 +294,158 @@ async function syncPickMode() {
  await setPickModeOnTab(state === 'idle' && !pageRestricted)
 }

+async function readSelectionFromStorage() {
+  try {
+    const data = await storageArea().get(SESSION_KEY)
+    const session = data?.[SESSION_KEY]
+    if (!session) return null
+    logDiag('storage read', `url=${session.url?.slice(0, 60)} sel=${session.text?.length || 0}`)
+    return session
+  } catch (err) {
+    logDiag('storage read failed', String(err?.message || err))
+    return null
+  }
+}
+
+function applySelectionFromMessage(msg, { fromStorage = false, fromPing = false, fromSetPickMode = false } = {}) {
+  if (!msg) return
+  const normalizeUrl = (u) => {
+    if (!u) return ''
+    try { return new URL(u).origin + new URL(u).pathname.replace(/\/+$/, '') }
+    catch { return u }
+  }
+  const msgUrl = msg.url || ''
+  const curUrl = pageUrl || ''
+
+  if (!curUrl) {
+    if (msgUrl) {
+      pageUrl = msgUrl
+      pageTitle = msg.title || pageTitle || ''
+      try {
+        const u = new URL(msgUrl)
+        pageDomain = u.hostname
+        pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
+      } catch { /* ignore */ }
+    } else {
+      return
+    }
+  } else if (normalizeUrl(msgUrl) !== normalizeUrl(curUrl)) {
+    return
+  }
+
+  selectionText = msg.text || ''
+  if (msg.dir?.toLowerCase() === 'rtl') pageDir = 'rtl'
+  if (msg.lang) pageLang = msg.lang
+  logDiag('selection applied', `len=${selectionText.length} source=${fromStorage ? 'storage' : fromPing ? 'ping' : fromSetPickMode ? 'setPickMode' : 'message'}`)
+  if (state === 'idle') {
+    if (!curUrl) render()
+    else updateSelectionUI()
+  }
+}
+
+async function refreshPageContext() {
+  logDiag('refreshPageContext start')
+  const tab = await getActiveTab()
+  activeTabId = tab?.id ?? null
+  pageRestricted = tab?.url ? isRestrictedUrl(tab.url) : false
+  logDiag('active tab', `id=${activeTabId} url=${tab?.url?.slice(0, 80)} restricted=${pageRestricted}`)
+
+  if (!tab?.id || pageRestricted) {
+    pageUrl = tab?.url || ''
+    pageTitle = tab?.title || t('pageNotAccessible')
+    selectionText = ''
+    contentScriptReady = false
+    return
+  }
+
+  pageUrl = tab.url
+  pageTitle = tab.title || ''
+  try {
+    const u = new URL(pageUrl)
+    pageDomain = u.hostname
+    pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
+  } catch {
+    pageDomain = pageUrl
+    pageFavicon = 'https://www.google.com/s2/favicons?domain=google.com&sz=32'
+  }
+
+  const ok = await ensureContentScript(tab.id)
+  if (!ok) {
+    // En dernier recours, lire depuis le storage session/local.
+    const session = await readSelectionFromStorage()
+    if (session) applySelectionFromMessage(session, { fromStorage: true })
+    return
+  }
+
+  try {
+    const ctx = await chrome.tabs.sendMessage(tab.id, { type: 'GET_CONTEXT' })
+    pageHtml = ctx?.html || ''
+    selectionText = ctx?.text || ''
+    pageDir = ctx?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
+    pageLang = ctx?.lang || ''
+    logDiag('GET_CONTEXT ok', `html=${pageHtml.length} sel=${selectionText.length}`)
+  } catch (err) {
+    logDiag('GET_CONTEXT failed', String(err?.message || err))
+    // Fallback storage
+    const session = await readSelectionFromStorage()
+    if (session) applySelectionFromMessage(session, { fromStorage: true })
+  }
+}
+
+async function loadSettings() {
+  const stored = await chrome.storage.sync.get([STORAGE_KEYS.baseUrl, STORAGE_KEYS.notebookId])
+  if (els.baseUrl) {
+    els.baseUrl.value = ALLOW_INSTANCE_CONFIG
+      ? stored[STORAGE_KEYS.baseUrl] || DEFAULT_BASE
+      : DEFAULT_BASE
+  }
+  await loadNotebooks(stored[STORAGE_KEYS.notebookId])
+}
+
+async function loadNotebooks(preferredId) {
+  try {
+    await ensureApiPermission()
+    const res = await fetch(`${apiBase()}/api/clip/notebooks`, { credentials: 'include' })
+    if (!res.ok) {
+      connected = false
+      updateConnBadge()
+      if (res.status === 401) {
+        throw new Error(t('errLoginRequired'))
+      }
+      throw new Error(t('errLoadNotebooks'))
+    }
+    const data = await res.json()
+    notebooks = data.notebooks || []
+    selectedNotebookId =
+      (preferredId && notebooks.some((n) => n.id === preferredId) ? preferredId : '') ||
+      notebooks[0]?.id ||
+      ''
+    connected = true
+    updateConnBadge()
+    errorMessage = ''
+    setSettingsStatus(t('notebooksLoaded'), false)
+    logDiag('notebooks loaded', `${notebooks.length}`)
+  } catch (e) {
+    notebooks = []
+    connected = false
+    updateConnBadge()
+    errorMessage = e.message
+    setSettingsStatus(e.message, true)
+    logDiag('notebooks failed', e.message)
+  }
+}
+
+async function applyInstance() {
+  const url = (els.baseUrl?.value || DEFAULT_BASE).replace(/\/$/, '')
+  if (els.baseUrl) els.baseUrl.value = url
+  await chrome.storage.sync.set({ [STORAGE_KEYS.baseUrl]: url })
+  setSettingsStatus(t('connecting'), false)
+  await loadNotebooks(selectedNotebookId)
+  if (connected) {
+    setSettingsStatus(t('connectedToUrl', url), false)
+  }
+}
+
 function updateConnBadge() {
  if (!els.connBadge) return
  els.connBadge.hidden = !connected
@@ -256,7 +483,10 @@ function selectionBlockHtml() {

 function actionsBlockHtml() {
  const hasSel = Boolean(selectionText)
-  return `<div class="actions" id="actionsSlot">
+  const contentScriptWarning = !contentScriptReady && !pageRestricted
+    ? `<div class="cs-warning">${escapeHtml(t('contentScriptMissing') || 'Content script non détecté — rechargez la page pour clipper.')}</div>`
+    : ''
+  return `${contentScriptWarning}<div class="actions" id="actionsSlot">
    ${
      hasSel
        ? `<button type="button" class="btn btn-sky" id="clipSelBtn">
@@ -283,7 +513,6 @@ function bindIdleHandlers() {
  document.getElementById('clipPageBtn')?.addEventListener('click', () => void runAnalyze('page'))
  document.getElementById('clipLinkBtn')?.addEventListener('click', () => void runAnalyze('link'))

-  // Gérer l'erreur de chargement du favicon
  document.querySelector('.page-favicon')?.addEventListener('error', function() {
    const fallback = this.getAttribute('data-fallback')
    if (fallback && this.src !== fallback) {
@@ -319,160 +548,6 @@ function updateSelectionUI() {
  bindIdleHandlers()
 }

-function applySelectionFromMessage(msg) {
-  if (!msg) return
-  // Comparaison d'URL tolérante : ignorer trailing slash, hash, query.
-  // Compare origin + pathname, pas l'URL complète.
-  const normalizeUrl = (u) => {
-    if (!u) return ''
-    try { return new URL(u).origin + new URL(u).pathname.replace(/\/+$/, '') }
-    catch { return u }
-  }
-  const msgUrl = msg.url || ''
-  const curUrl = pageUrl || ''
-  // Si pageUrl n'est pas encore set (race avec refreshPageContext),
-  // on accepte le premier message qui arrive et on amorce les métadonnées
-  // de la page depuis le message. Sans ce fallback, le bouton ne s'affiche
-  // jamais si chrome.tabs.query rate ou revient avant refreshPageContext.
-  if (!curUrl) {
-    if (msgUrl) {
-      pageUrl = msgUrl
-      pageTitle = msg.title || pageTitle || ''
-      try {
-        const u = new URL(msgUrl)
-        pageDomain = u.hostname
-        pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
-      } catch { /* ignore */ }
-    } else {
-      return
-    }
-  } else if (normalizeUrl(msgUrl) !== normalizeUrl(curUrl)) {
-    // URL vraiment différente (autre onglet) — ignorer.
-    return
-  }
-  selectionText = msg.text || ''
-  if (msg.dir?.toLowerCase() === 'rtl') pageDir = 'rtl'
-  if (msg.lang) pageLang = msg.lang
-  if (state === 'idle') {
-    // Si la page card n'existait pas encore (pageUrl vide avant),
-    // il faut un render() complet pour qu'elle apparaisse.
-    if (!curUrl) {
-      render()
-    } else {
-      updateSelectionUI()
-    }
-  } else {
-    console.debug('[memento] selection updated while busy, deferring UI')
-  }
-}
-
-async function refreshPageContext() {
-  const tab = await getActiveTab()
-  activeTabId = tab?.id ?? null
-  // Ne marquer restricted QUE si on a vraiment une URL à analyser.
-  // tab?.url undefined doit être traité comme "inconnu", pas restricted.
-  pageRestricted = tab?.url ? isRestrictedUrl(tab.url) : false
-
-  if (!tab?.id || pageRestricted) {
-    pageUrl = tab?.url || ''
-    pageTitle = tab?.title || t('pageNotAccessible')
-    selectionText = ''
-    return
-  }
-
-  pageUrl = tab.url
-  pageTitle = tab.title || ''
-  try {
-    const u = new URL(pageUrl)
-    pageDomain = u.hostname
-    pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
-  } catch {
-    pageDomain = pageUrl
-    pageFavicon = 'https://www.google.com/s2/favicons?domain=google.com&sz=32'
-  }
-
-  const ok = await ensureContentScript(tab.id)
-  if (!ok) return
-
-  try {
-    const ctx = await chrome.tabs.sendMessage(tab.id, { type: 'GET_CONTEXT' })
-    pageHtml = ctx?.html || ''
-    selectionText = ctx?.text || ''
-    pageDir = ctx?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
-    pageLang = ctx?.lang || ''
-  } catch {
-    try {
-      const [{ result }] = await chrome.scripting.executeScript({
-        target: { tabId: tab.id },
-        func: () => ({
-          html: document.documentElement.outerHTML,
-          text: window.getSelection()?.toString().trim() || '',
-          dir: document.documentElement.getAttribute('dir') || '',
-          lang: (document.documentElement.getAttribute('lang') || '').split('-')[0],
-        }),
-      })
-      pageHtml = result?.html || ''
-      selectionText = result?.text || ''
-      pageDir = result?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
-      pageLang = result?.lang || ''
-    } catch {
-      /* ignore */
-    }
-  }
-}
-
-async function loadSettings() {
-  const stored = await chrome.storage.sync.get([STORAGE_KEYS.baseUrl, STORAGE_KEYS.notebookId])
-  if (els.baseUrl) {
-    els.baseUrl.value = ALLOW_INSTANCE_CONFIG
-      ? stored[STORAGE_KEYS.baseUrl] || DEFAULT_BASE
-      : DEFAULT_BASE
-  }
-  await loadNotebooks(stored[STORAGE_KEYS.notebookId])
-}
-
-async function loadNotebooks(preferredId) {
-  try {
-    await ensureApiPermission()
-    const res = await fetch(`${apiBase()}/api/clip/notebooks`, { credentials: 'include' })
-    if (!res.ok) {
-      connected = false
-      updateConnBadge()
-      if (res.status === 401) {
-        throw new Error(t('errLoginRequired'))
-      }
-      throw new Error(t('errLoadNotebooks'))
-    }
-    const data = await res.json()
-    notebooks = data.notebooks || []
-    selectedNotebookId =
-      (preferredId && notebooks.some((n) => n.id === preferredId) ? preferredId : '') ||
-      notebooks[0]?.id ||
-      ''
-    connected = true
-    updateConnBadge()
-    errorMessage = ''
-    setSettingsStatus(t('notebooksLoaded'), false)
-  } catch (e) {
-    notebooks = []
-    connected = false
-    updateConnBadge()
-    errorMessage = e.message
-    setSettingsStatus(e.message, true)
-  }
-}
-
-async function applyInstance() {
-  const url = (els.baseUrl?.value || DEFAULT_BASE).replace(/\/$/, '')
-  if (els.baseUrl) els.baseUrl.value = url
-  await chrome.storage.sync.set({ [STORAGE_KEYS.baseUrl]: url })
-  setSettingsStatus(t('connecting'), false)
-  await loadNotebooks(selectedNotebookId)
-  if (connected) {
-    setSettingsStatus(t('connectedToUrl', url), false)
-  }
-}
-
 function renderIdle() {
  const restrictedBlock = pageRestricted
    ? `<div class="restricted-note">${escapeHtml(t('restrictedPage'))}</div>`
@@ -483,9 +558,14 @@ function renderIdle() {
      ? `<div class="auth-hint">${escapeHtml(errorMessage)}</div>`
      : ''

+  const csWarning = !contentScriptReady && !pageRestricted
+    ? `<div class="cs-warning">${escapeHtml(t('contentScriptMissing') || 'Content script non détecté — rechargez la page pour clipper.')}</div>`
+    : ''
+
  els.screen.innerHTML = `
    ${restrictedBlock}
    ${authHint}
+    ${csWarning}

    <div>
      <span class="label">${escapeHtml(t('destinationNotebook'))}</span>
@@ -532,10 +612,10 @@ function renderConfirm() {
  const reading = formatReadingTime(analyzeResult?.readingTime)
  const tagsHtml = tags.map((t) => `<span class="tag-chip">${escapeHtml(t)}</span>`).join('')

-  // Le résumé et l'extrait peuvent contenir du Markdown produit par l'IA.
-  // On rend le Markdown en HTML (limité et sûr) au lieu de l'afficher brut.
+  // Le résumé peut contenir du Markdown produit par l'IA.
+  // L'extrait est du texte brut : on l'affiche tel quel, sans interpréter de Markdown.
  const summaryHtml = summary ? renderMarkdownSafe(summary) : ''
-  const excerptHtml = (excerpt && pendingClipType !== 'link') ? renderMarkdownSafe(excerpt) : ''
+  const excerptHtml = (excerpt && pendingClipType !== 'link') ? escapePlainText(excerpt) : ''

  els.screen.innerHTML = `
    <div class="confirm-panel">
@@ -552,7 +632,7 @@ function renderConfirm() {
      </section>` : ''}
      ${excerptHtml ? `<section class="preview-block excerpt-block"${rtlAttrs(excerpt)}>
        <header class="preview-block-head"><span class="dot dot-excerpt"></span>${escapeHtml(t('excerptLabel'))}</header>
-        <div class="preview-block-body md md-excerpt">${excerptHtml}</div>
+        <div class="preview-block-body md md-excerpt excerpt-plain">${excerptHtml}</div>
      </section>` : ''}
    </div>
    <div class="actions">
@@ -670,6 +750,7 @@ async function runAnalyze(type) {
      analyzeBody = { url: pageUrl, html: pageHtml, title: pageTitle, mode: 'article' }
    }

+    logDiag('analyze request', `${type} url=${pageUrl?.slice(0, 60)}`)
    const analyzeRes = await fetch(`${apiBase()}/api/clip/analyze`, {
      method: 'POST',
      credentials: 'include',
@@ -682,10 +763,12 @@ async function runAnalyze(type) {
    analyzeResult = analysis
    editableTitle = analysis.title || pageTitle || pageDomain
    state = 'confirm'
+    logDiag('analyze ok', `title=${analysis.title?.slice(0, 40)}`)
    render()
  } catch (e) {
    errorMessage = e.message || t('errNetwork')
    state = 'error'
+    logDiag('analyze error', errorMessage)
    render()
  }
 }
@@ -717,20 +800,34 @@ async function runSave() {
    lastNoteId = saved.noteId
    lastNoteUrl = saved.noteUrl
    state = 'success'
+    logDiag('save ok', `noteId=${lastNoteId}`)
    render()
  } catch (e) {
    errorMessage = e.message || t('errNetwork')
    state = 'error'
+    logDiag('save error', errorMessage)
    render()
  }
 }

 chrome.runtime.onMessage.addListener((msg) => {
-  if (msg?.type === 'SELECTION_CHANGED') applySelectionFromMessage(msg)
+  if (msg?.type === 'SELECTION_CHANGED') {
+    logDiag('SELECTION_CHANGED received', `len=${msg.text?.length || 0}`)
+    applySelectionFromMessage(msg)
+  }
+})
+
+// Surveiller le storage session/local en cas de message perdu.
+storageArea().onChanged.addListener((changes) => {
+  if (changes[SESSION_KEY]?.newValue) {
+    logDiag('storage changed event')
+    applySelectionFromMessage(changes[SESSION_KEY].newValue, { fromStorage: true })
+  }
 })

 chrome.tabs.onActivated.addListener(async () => {
  if (state !== 'idle') return
+  logDiag('tabs.onActivated')
  await refreshPageContext()
  await syncPickMode()
  render()
@@ -740,6 +837,7 @@ chrome.tabs.onUpdated.addListener(async (tabId, info) => {
  if (info.status !== 'complete' || state !== 'idle') return
  const tab = await getActiveTab()
  if (tab?.id === tabId) {
+    logDiag('tabs.onUpdated complete')
    await refreshPageContext()
    await syncPickMode()
    render()
@@ -751,6 +849,14 @@ els.settingsBtn?.addEventListener('click', () => {
  els.settingsPanel.hidden = !els.settingsPanel.hidden
 })

+els.diagToggle?.addEventListener('click', () => {
+  diagOpen = !diagOpen
+  if (els.diagPanel) els.diagPanel.hidden = !diagOpen
+  if (els.diagToggle) els.diagToggle.setAttribute('aria-expanded', String(diagOpen))
+})
+
+els.copyDiagBtn?.addEventListener('click', () => void copyDiagnostics())
+
 document.querySelectorAll('.preset-btn').forEach((btn) => {
  btn.addEventListener('click', () => {
    const url = btn.getAttribute('data-url')
@@ -766,12 +872,12 @@ els.openLoginBtn?.addEventListener('click', () => {
 document.addEventListener('visibilitychange', async () => {
  if (document.visibilityState === 'visible') {
    if (state === 'idle') {
+      logDiag('visibility visible')
      await refreshPageContext()
      await syncPickMode()
      render()
    }
  } else if (document.visibilityState === 'hidden') {
-    // Désactiver le pick mode quand le sidepanel est fermé
    await setPickModeOnTab(false)
  }
 })
--- a/memento-note/extension/dist-firefox/_locales/ar/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/ar/messages.json
@@ -36,7 +36,7 @@
    "message": "الصق عنوان URL الخاص بـ HTTPS (أو LAN) لخادم Memento الخاص بك. تتعامل ملفات تعريف الارتباط الموجودة في هذا المتصفح مع تسجيل الدخول."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<الإصدار>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "لا يستطيع Memento الوصول إلى علامة التبويب هذه. تحقق من أذونات ملحق لوحة المفاتيح/الموقع — أو افتح اللوحة الجانبية."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "ملخص"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/de/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/de/messages.json
@@ -36,7 +36,7 @@
    "message": "Fügen Sie die HTTPS- (oder LAN-)URL Ihres Memento-Servers ein. Cookies in diesem Browser verarbeiten die Anmeldung."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento kann nicht auf diese Registerkarte zugreifen. Überprüfen Sie die Tastatur-/Site-Erweiterungsberechtigungen – oder öffnen Sie den Seitenbereich."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Zusammenfassung"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/en/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/en/messages.json
@@ -36,7 +36,7 @@
    "message": "Paste the HTTPS (or LAN) URL of your Memento server. Cookies in this browser handle sign-in."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento can't access this tab. Check keyboard/site extension permissions — or open the Side Panel."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Summary"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/es/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/es/messages.json
@@ -36,7 +36,7 @@
    "message": "Pegue la URL HTTPS (o LAN) de su servidor Memento. Las cookies en este navegador controlan el inicio de sesión."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIÓN>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento no puede acceder a esta pestaña. Verifique los permisos de extensión del sitio/teclado o abra el Panel lateral."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Resumen"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/fa/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/fa/messages.json
@@ -36,7 +36,7 @@
    "message": "URL HTTPS (یا LAN) سرور Memento خود را جایگذاری کنید. کوکی‌های این مرورگر ورود به سیستم را کنترل می‌کنند."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento نمی تواند به این برگه دسترسی پیدا کند. مجوزهای افزونه صفحه کلید/سایت را بررسی کنید - یا پانل جانبی را باز کنید."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "خلاصه"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/fr/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/fr/messages.json
@@ -36,13 +36,13 @@
    "message": "Collez l'URL HTTPS (ou LAN) de votre serveur Memento. Les cookies de ce navigateur gèrent la connexion."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper 0.4.3"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento ne peut pas accéder à cet onglet. Vérifiez les autorisations du clavier/extension de site – ou ouvrez le panneau latéral."
  },
  "notebookUnnamed": {
-    "message": "Carnet sans titre"
+    "message": "Carnet sans nom"
  },
  "noNotebooks": {
    "message": "Pas encore de carnets"
@@ -63,7 +63,7 @@
    "message": "Sélection détectée"
  },
  "ignore": {
-    "message": "ignorer"
+    "message": "Ignorer"
  },
  "selectionHint": {
    "message": "Astuce : surlignez du texte sur la page pour clipper une sélection précise en note."
@@ -123,22 +123,22 @@
    "message": "Enregistrer dans Memento"
  },
  "back": {
-    "message": "Dos"
+    "message": "Retour"
  },
  "analyzingSource": {
    "message": "Analyse de la source"
  },
  "statusAnalyzing": {
-    "message": "Analyser…"
+    "message": "Analyse en cours…"
  },
  "statusSaving": {
-    "message": "Économie…"
+    "message": "Enregistrement…"
  },
  "processingDetail": {
    "message": "Génération automatique des tags, résumé sémantique et calcul des embeddings."
  },
  "noteSaved": {
-    "message": "Remarque enregistrée"
+    "message": "Note enregistrée"
  },
  "sentToNotebook": {
    "message": "Enregistré dans $NOTEBOOK$",
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Résumé"
+  },
+  "contentScriptMissing": {
+    "message": "Content script non détecté — rechargez la page pour clipper."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copier"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/hi/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/hi/messages.json
@@ -36,7 +36,7 @@
    "message": "अपने मोमेंटो सर्वर का HTTPS (या LAN) URL चिपकाएँ। इस ब्राउज़र में कुकीज़ साइन-इन को संभालती हैं।"
  },
  "footerVersion": {
-    "message": "मोमेंटो वेब क्लिपर <<<संस्करण>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "मोमेंटो इस टैब तक नहीं पहुंच सकता. कीबोर्ड/साइट एक्सटेंशन अनुमतियां जांचें - या साइड पैनल खोलें।"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "सारांश"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/it/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/it/messages.json
@@ -36,7 +36,7 @@
    "message": "Incolla l'URL HTTPS (o LAN) del tuo server Memento. I cookie in questo browser gestiscono l'accesso."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIONE>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento non può accedere a questa scheda. Controlla le autorizzazioni per tastiera/estensione del sito oppure apri il pannello laterale."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Riepilogo"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/ja/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/ja/messages.json
@@ -36,7 +36,7 @@
    "message": "Memento サーバーの HTTPS (または LAN) URL を貼り付けます。このブラウザの Cookie がサインインを処理します。"
  },
  "footerVersion": {
-    "message": "Memento Web クリッパー <<<バージョン>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento はこのタブにアクセスできません。キーボード/サイト拡張機能の権限を確認するか、サイド パネルを開きます。"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "要約"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/ko/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/ko/messages.json
@@ -36,7 +36,7 @@
    "message": "Memento 서버의 HTTPS(또는 LAN) URL을 붙여넣습니다. 이 브라우저의 쿠키는 로그인을 처리합니다."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<버전>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento는 이 탭에 접근할 수 없습니다. 키보드/사이트 확장 권한을 확인하거나 측면 패널을 엽니다."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "요약"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/nl/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/nl/messages.json
@@ -36,7 +36,7 @@
    "message": "Plak de HTTPS (of LAN) URL van uw Memento-server. Cookies in deze browser zorgen voor het inloggen."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSIE>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento heeft geen toegang tot dit tabblad. Controleer de rechten voor toetsenbord-/site-extensies — of open het zijpaneel."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Samenvatting"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/pl/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/pl/messages.json
@@ -36,7 +36,7 @@
    "message": "Wklej adres URL HTTPS (lub LAN) swojego serwera Memento. Pliki cookie w tej przeglądarce obsługują logowanie."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<WERSJA>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento nie ma dostępu do tej karty. Sprawdź uprawnienia rozszerzenia klawiatury/witryny — lub otwórz Panel boczny."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Streszczenie"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/pt/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/pt/messages.json
@@ -36,7 +36,7 @@
    "message": "Cole o URL HTTPS (ou LAN) do seu servidor Memento. Os cookies neste navegador controlam o login."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<VERSÃO>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento não pode acessar esta guia. Verifique as permissões de extensão de teclado/site – ou abra o painel lateral."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Resumo"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/ru/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/ru/messages.json
@@ -36,7 +36,7 @@
    "message": "Вставьте URL-адрес HTTPS (или LAN) вашего сервера Memento. Файлы cookie в этом браузере обрабатывают вход в систему."
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<ВЕРСИЯ>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento не имеет доступа к этой вкладке. Проверьте разрешения для расширения клавиатуры/сайта или откройте боковую панель."
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "Сводка"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/_locales/zh/messages.json
+++ b/memento-note/extension/dist-firefox/_locales/zh/messages.json
@@ -36,7 +36,7 @@
    "message": "粘贴 Memento 服务器的 HTTPS（或 LAN）URL。此浏览器中的 Cookie 处理登录。"
  },
  "footerVersion": {
-    "message": "Memento Web Clipper <<<版本>>>"
+    "message": "Memento Web Clipper 0.4.4"
  },
  "errPermissionDenied": {
    "message": "Memento 无法访问此选项卡。检查键盘/站点扩展权限 - 或打开侧面板。"
@@ -192,5 +192,14 @@
  },
  "summaryLabel": {
    "message": "摘要"
+  },
+  "contentScriptMissing": {
+    "message": "Content script not detected — reload the page to clip."
+  },
+  "diagnosticsTitle": {
+    "message": "Diagnostic"
+  },
+  "copyDiagnostics": {
+    "message": "Copy"
  }
 }
--- a/memento-note/extension/dist-firefox/content.js
+++ b/memento-note/extension/dist-firefox/content.js
@@ -1,6 +1,12 @@
 /**
 * Content script Momento — sélection live, surlignage, communication avec le side panel.
 * Injecté automatiquement sur http(s) ; ré-injecté à la demande si l’onglet était déjà ouvert.
+ *
+ * Architecture v0.4.4 :
+ * - La sélection courante est écrite dans chrome.storage.session/local comme source de vérité
+ *   (filet de sécurité si le runtime.sendMessage est perdu).
+ * - Les messages runtime servent de notification rapide au side panel.
+ * - SET_PICK_MODE répond toujours avec l’état pickMode + la sélection courante.
 */
 ;(function initMementoClipperContent() {
  if (globalThis.__mementoClipperContent) return
@@ -9,10 +15,16 @@
  const HIGHLIGHT_ID = 'memento-clipper-highlight-root'
  const BANNER_ID = 'memento-clipper-banner-root'
  const STYLE_ID = 'memento-clipper-styles'
+  const SESSION_KEY = 'memento_clipper_session'

  let pickMode = false
  let debounceTimer = null

+  function storageArea() {
+    // Firefox < 128 n’a pas storage.session en MV3 ; on fallback sur local.
+    return chrome.storage.session || chrome.storage.local
+  }
+
  function getSelectionText() {
    return window.getSelection()?.toString().trim() || ''
  }
@@ -36,10 +48,25 @@
    }
  }

+  async function writeSession(extra = {}) {
+    try {
+      await storageArea().set({
+        [SESSION_KEY]: {
+          ...getPageMeta(),
+          ...extra,
+          updatedAt: Date.now(),
+        },
+      })
+    } catch (err) {
+      console.debug('[memento] storage session write failed', err)
+    }
+  }
+
  function broadcastSelection() {
    clearTimeout(debounceTimer)
-    debounceTimer = setTimeout(() => {
+    debounceTimer = setTimeout(async () => {
      const payload = { type: 'SELECTION_CHANGED', ...getPageMeta() }
+      writeSession({ source: 'selection' })
      try {
        chrome.runtime.sendMessage(payload).catch(() => {})
      } catch {
@@ -189,7 +216,7 @@

  chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
    if (message?.type === 'PING') {
-      sendResponse({ ok: true })
+      sendResponse({ ok: true, pickMode, selection: getPageMeta() })
      return true
    }
    if (message?.type === 'GET_CONTEXT') {
@@ -201,11 +228,13 @@
    }
    if (message?.type === 'SET_PICK_MODE') {
      setPickMode(!!message.enabled)
-      sendResponse({ ok: true, pickMode })
+      sendResponse({ ok: true, pickMode, selection: getPageMeta() })
      return true
    }
    return false
  })

+  // Amorcer le storage dès l'injection (utile si une sélection existait avant l'ouverture du side panel).
+  writeSession({ source: 'init' })
  broadcastSelection()
 })()
--- a/memento-note/extension/dist-firefox/i18n.js
+++ b/memento-note/extension/dist-firefox/i18n.js
@@ -44,4 +44,13 @@ function applyShellI18n() {
  if (hint) hint.textContent = t('settingsHint')
  const footer = document.querySelector('.footer-meta')
  if (footer) footer.textContent = t('footerVersion')
+  if (typeof els !== 'undefined' && els.diagToggle) {
+    const diagTitle = t('diagnosticsTitle') || 'Diagnostic'
+    els.diagToggle.title = diagTitle
+    els.diagToggle.setAttribute('aria-label', diagTitle)
+  }
+  const diagTitleEl = document.querySelector('.diag-title')
+  if (diagTitleEl) diagTitleEl.textContent = t('diagnosticsTitle') || 'Diagnostic'
+  const copyDiagBtn = document.getElementById('copyDiagBtn')
+  if (copyDiagBtn) copyDiagBtn.textContent = t('copyDiagnostics') || 'Copier'
 }
--- a/memento-note/extension/dist-firefox/manifest.json
+++ b/memento-note/extension/dist-firefox/manifest.json
@@ -1,7 +1,7 @@
 {
  "manifest_version": 3,
  "name": "__MSG_extName__",
-  "version": "0.4.3",
+  "version": "0.4.4",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "permissions": [
--- a/memento-note/extension/dist-firefox/sidepanel.css
+++ b/memento-note/extension/dist-firefox/sidepanel.css
@@ -519,12 +519,23 @@ input[type="text"]:focus,
  overflow-wrap: anywhere;
 }
 .excerpt-block .preview-block-body {
-  min-height: 180px;
-  max-height: 360px;
+  min-height: 220px;
+  max-height: 520px;
  overflow-y: auto;
  background: #fcfbf9;
+  font-size: 14px;
+  line-height: 1.75;
+  padding: 16px 18px;
 }
+
+.excerpt-plain {
+  white-space: normal;
+}
+
 .summary-block .preview-block-body {
+  min-height: 120px;
+  max-height: 360px;
+  overflow-y: auto;
  font-style: normal;
  color: rgba(28, 28, 28, 0.78);
  background: rgba(2, 132, 199, 0.04);
@@ -639,6 +650,77 @@ html[dir="rtl"] .sub {
  .page-row .title { font-size: 14px; }
 }

+/* Avertissement content script */
+.cs-warning {
+  padding: 10px 12px;
+  border-radius: var(--radius-sm);
+  background: #fff7ed;
+  border: 1px solid #fdba74;
+  color: #9a3412;
+  font-size: 11px;
+  line-height: 1.5;
+  margin-bottom: 8px;
+}
+
+/* Panneau de diagnostic */
+.diag-panel {
+  border-top: 1px solid var(--border);
+  background: #1c1c1c;
+  color: #e5e5e5;
+  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
+  font-size: 10px;
+  line-height: 1.5;
+}
+.diag-panel[hidden] { display: none !important; }
+.diag-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 8px 12px;
+  background: #2a2a2a;
+}
+.diag-title {
+  font-weight: 700;
+  color: #a3a3a3;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+}
+.diag-copy {
+  background: transparent;
+  border: 1px solid #525252;
+  color: #d4d4d4;
+  border-radius: 6px;
+  padding: 4px 8px;
+  font-size: 10px;
+  cursor: pointer;
+}
+.diag-copy:hover { background: #404040; }
+.diag-body {
+  max-height: 160px;
+  overflow-y: auto;
+  padding: 8px 12px;
+}
+.diag-line {
+  padding: 2px 0;
+  border-bottom: 1px solid #333;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+.diag-line:last-child { border-bottom: none; }
+
+.diag-toggle {
+  background: none;
+  border: none;
+  color: var(--muted);
+  cursor: pointer;
+  padding: 4px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.diag-toggle:hover { color: var(--ink); }
+
 /* Très petits écrans (mobile debug, fenetres étirées) */
@media (max-width: 320px) {
  .brand-text { display: none; }
--- a/memento-note/extension/dist-firefox/sidepanel.html
+++ b/memento-note/extension/dist-firefox/sidepanel.html
@@ -24,6 +24,9 @@
          <span class="conn-dot"></span>
          <span id="connLabel"></span>
        </div>
+        <button type="button" id="diagToggle" class="diag-toggle" title="Diagnostic" aria-label="Diagnostic" aria-expanded="false">
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M12 22c5.523 0 10-4.477 10-10S17.523 2 12 2 2 6.477 2 12s4.477 10 10 10z"/><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"/><line x1="12" y1="17" x2="12.01" y2="17"/></svg>
+        </button>
        <button type="button" id="settingsBtn" class="icon-btn" title="" aria-label="">
          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="3"/><path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/></svg>
        </button>
@@ -53,6 +56,14 @@
    <footer class="footer">
      <span class="footer-meta"></span>
    </footer>
+
+    <div id="diagPanel" class="diag-panel" hidden>
+      <div class="diag-head">
+        <span class="diag-title">Diagnostic</span>
+        <button type="button" id="copyDiagBtn" class="diag-copy">Copier</button>
+      </div>
+      <div id="diagBody" class="diag-body"></div>
+    </div>
  </div>
  <script src="i18n.js"></script>
  <script src="sidepanel.js"></script>
--- a/memento-note/extension/dist-firefox/sidepanel.js
+++ b/memento-note/extension/dist-firefox/sidepanel.js
@@ -2,6 +2,7 @@
 const ALLOW_INSTANCE_CONFIG = false
 const DEFAULT_BASE = 'https://memento-note.com'
 const STORAGE_KEYS = { baseUrl: 'memento_clipper_base_url', notebookId: 'memento_clipper_notebook_id' }
+const SESSION_KEY = 'memento_clipper_session'

 let state = 'idle'
 let notebooks = []
@@ -25,6 +26,9 @@ let pendingClipType = 'page'
 let analyzeResult = null
 let editableTitle = ''
 let connected = false
+let contentScriptReady = false
+const diagLogs = []
+let diagOpen = false

 const els = {
  screen: document.getElementById('screen'),
@@ -36,6 +40,10 @@ const els = {
  settingsStatus: document.getElementById('settingsStatus'),
  applyInstanceBtn: document.getElementById('applyInstanceBtn'),
  openLoginBtn: document.getElementById('openLoginBtn'),
+  diagPanel: document.getElementById('diagPanel'),
+  diagToggle: document.getElementById('diagToggle'),
+  diagBody: document.getElementById('diagBody'),
+  copyDiagBtn: document.getElementById('copyDiagBtn'),
 }

 const ICON_SELECT =
@@ -71,6 +79,10 @@ function escapeHtml(s) {
    .replace(/"/g, '&quot;')
 }

+function escapePlainText(s) {
+  return escapeHtml(s).replace(/\n/g, '<br/>')
+}
+
 /**
 * Mini-renderer Markdown sûr pour le side panel.
 * - Échappe d'abord le texte (anti-XSS)
@@ -136,6 +148,38 @@ function rtlAttrs(text) {
  return ` class="text-rtl" dir="rtl"${lang}`
 }

+// ---------------------------------------------------------------------------
+// Diagnostic logging
+// ---------------------------------------------------------------------------
+
+function logDiag(label, detail = '') {
+  const line = `[${new Date().toLocaleTimeString()}] ${label}${detail ? ` — ${detail}` : ''}`
+  diagLogs.push(line)
+  if (diagLogs.length > 80) diagLogs.shift()
+  renderDiag()
+  console.debug('[memento-diag]', label, detail)
+}
+
+function renderDiag() {
+  if (!els.diagBody) return
+  els.diagBody.innerHTML = diagLogs.map((l) => `<div class="diag-line">${escapeHtml(l)}</div>`).join('')
+  els.diagBody.scrollTop = els.diagBody.scrollHeight
+}
+
+async function copyDiagnostics() {
+  try {
+    const text = diagLogs.join('\n')
+    await navigator.clipboard.writeText(text)
+    logDiag('diagnostics copied')
+  } catch (e) {
+    logDiag('copy failed', String(e))
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Notebooks
+// ---------------------------------------------------------------------------
+
 function sortNotebooksHierarchy(list) {
  const byParent = new Map()
  for (const n of list) {
@@ -189,29 +233,60 @@ async function getActiveTab() {
  return tab
 }

+// ---------------------------------------------------------------------------
+// Content script synchronization (v0.4.4)
+// ---------------------------------------------------------------------------
+
+function storageArea() {
+  return chrome.storage.session || chrome.storage.local
+}
+
 async function ensureContentScript(tabId) {
+  logDiag('ensureContentScript start', `tab=${tabId}`)
  try {
    const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
-    if (resp?.ok) return true
-  } catch {
-    /* inject */
+    if (resp?.ok) {
+      contentScriptReady = true
+      logDiag('PING ok', `pickMode=${resp.pickMode} sel=${resp.selection?.text?.length || 0}`)
+      if (resp.selection) applySelectionFromMessage(resp.selection, { fromPing: true })
+      return true
+    }
+  } catch (err) {
+    logDiag('PING failed', String(err?.message || err))
  }
  try {
    await chrome.scripting.executeScript({ target: { tabId }, files: ['content.js'] })
-    return true
-  } catch {
+    logDiag('content script injected')
+    // attendre un court instant que le script s'enregistre
+    await new Promise((r) => setTimeout(r, 120))
+    const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
+    contentScriptReady = resp?.ok || false
+    logDiag('PING after inject', `ok=${contentScriptReady}`)
+    return contentScriptReady
+  } catch (err) {
+    contentScriptReady = false
+    logDiag('content script inject failed', String(err?.message || err))
    return false
  }
 }

 async function setPickModeOnTab(enabled) {
-  if (!activeTabId || pageRestricted) return
+  if (!activeTabId || pageRestricted) {
+    logDiag('setPickMode skipped', `tab=${activeTabId} restricted=${pageRestricted}`)
+    return false
+  }
  const ok = await ensureContentScript(activeTabId)
-  if (!ok) return
+  if (!ok) return false
  try {
-    await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
-  } catch {
-    /* ignore */
+    const resp = await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
+    contentScriptReady = resp?.ok || false
+    logDiag('SET_PICK_MODE ok', `enabled=${enabled} pickMode=${resp?.pickMode}`)
+    if (resp?.selection) applySelectionFromMessage(resp.selection, { fromSetPickMode: true })
+    return contentScriptReady
+  } catch (err) {
+    contentScriptReady = false
+    logDiag('SET_PICK_MODE failed', String(err?.message || err))
+    return false
  }
 }

@@ -219,6 +294,158 @@ async function syncPickMode() {
  await setPickModeOnTab(state === 'idle' && !pageRestricted)
 }

+async function readSelectionFromStorage() {
+  try {
+    const data = await storageArea().get(SESSION_KEY)
+    const session = data?.[SESSION_KEY]
+    if (!session) return null
+    logDiag('storage read', `url=${session.url?.slice(0, 60)} sel=${session.text?.length || 0}`)
+    return session
+  } catch (err) {
+    logDiag('storage read failed', String(err?.message || err))
+    return null
+  }
+}
+
+function applySelectionFromMessage(msg, { fromStorage = false, fromPing = false, fromSetPickMode = false } = {}) {
+  if (!msg) return
+  const normalizeUrl = (u) => {
+    if (!u) return ''
+    try { return new URL(u).origin + new URL(u).pathname.replace(/\/+$/, '') }
+    catch { return u }
+  }
+  const msgUrl = msg.url || ''
+  const curUrl = pageUrl || ''
+
+  if (!curUrl) {
+    if (msgUrl) {
+      pageUrl = msgUrl
+      pageTitle = msg.title || pageTitle || ''
+      try {
+        const u = new URL(msgUrl)
+        pageDomain = u.hostname
+        pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
+      } catch { /* ignore */ }
+    } else {
+      return
+    }
+  } else if (normalizeUrl(msgUrl) !== normalizeUrl(curUrl)) {
+    return
+  }
+
+  selectionText = msg.text || ''
+  if (msg.dir?.toLowerCase() === 'rtl') pageDir = 'rtl'
+  if (msg.lang) pageLang = msg.lang
+  logDiag('selection applied', `len=${selectionText.length} source=${fromStorage ? 'storage' : fromPing ? 'ping' : fromSetPickMode ? 'setPickMode' : 'message'}`)
+  if (state === 'idle') {
+    if (!curUrl) render()
+    else updateSelectionUI()
+  }
+}
+
+async function refreshPageContext() {
+  logDiag('refreshPageContext start')
+  const tab = await getActiveTab()
+  activeTabId = tab?.id ?? null
+  pageRestricted = tab?.url ? isRestrictedUrl(tab.url) : false
+  logDiag('active tab', `id=${activeTabId} url=${tab?.url?.slice(0, 80)} restricted=${pageRestricted}`)
+
+  if (!tab?.id || pageRestricted) {
+    pageUrl = tab?.url || ''
+    pageTitle = tab?.title || t('pageNotAccessible')
+    selectionText = ''
+    contentScriptReady = false
+    return
+  }
+
+  pageUrl = tab.url
+  pageTitle = tab.title || ''
+  try {
+    const u = new URL(pageUrl)
+    pageDomain = u.hostname
+    pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
+  } catch {
+    pageDomain = pageUrl
+    pageFavicon = 'https://www.google.com/s2/favicons?domain=google.com&sz=32'
+  }
+
+  const ok = await ensureContentScript(tab.id)
+  if (!ok) {
+    // En dernier recours, lire depuis le storage session/local.
+    const session = await readSelectionFromStorage()
+    if (session) applySelectionFromMessage(session, { fromStorage: true })
+    return
+  }
+
+  try {
+    const ctx = await chrome.tabs.sendMessage(tab.id, { type: 'GET_CONTEXT' })
+    pageHtml = ctx?.html || ''
+    selectionText = ctx?.text || ''
+    pageDir = ctx?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
+    pageLang = ctx?.lang || ''
+    logDiag('GET_CONTEXT ok', `html=${pageHtml.length} sel=${selectionText.length}`)
+  } catch (err) {
+    logDiag('GET_CONTEXT failed', String(err?.message || err))
+    // Fallback storage
+    const session = await readSelectionFromStorage()
+    if (session) applySelectionFromMessage(session, { fromStorage: true })
+  }
+}
+
+async function loadSettings() {
+  const stored = await chrome.storage.sync.get([STORAGE_KEYS.baseUrl, STORAGE_KEYS.notebookId])
+  if (els.baseUrl) {
+    els.baseUrl.value = ALLOW_INSTANCE_CONFIG
+      ? stored[STORAGE_KEYS.baseUrl] || DEFAULT_BASE
+      : DEFAULT_BASE
+  }
+  await loadNotebooks(stored[STORAGE_KEYS.notebookId])
+}
+
+async function loadNotebooks(preferredId) {
+  try {
+    await ensureApiPermission()
+    const res = await fetch(`${apiBase()}/api/clip/notebooks`, { credentials: 'include' })
+    if (!res.ok) {
+      connected = false
+      updateConnBadge()
+      if (res.status === 401) {
+        throw new Error(t('errLoginRequired'))
+      }
+      throw new Error(t('errLoadNotebooks'))
+    }
+    const data = await res.json()
+    notebooks = data.notebooks || []
+    selectedNotebookId =
+      (preferredId && notebooks.some((n) => n.id === preferredId) ? preferredId : '') ||
+      notebooks[0]?.id ||
+      ''
+    connected = true
+    updateConnBadge()
+    errorMessage = ''
+    setSettingsStatus(t('notebooksLoaded'), false)
+    logDiag('notebooks loaded', `${notebooks.length}`)
+  } catch (e) {
+    notebooks = []
+    connected = false
+    updateConnBadge()
+    errorMessage = e.message
+    setSettingsStatus(e.message, true)
+    logDiag('notebooks failed', e.message)
+  }
+}
+
+async function applyInstance() {
+  const url = (els.baseUrl?.value || DEFAULT_BASE).replace(/\/$/, '')
+  if (els.baseUrl) els.baseUrl.value = url
+  await chrome.storage.sync.set({ [STORAGE_KEYS.baseUrl]: url })
+  setSettingsStatus(t('connecting'), false)
+  await loadNotebooks(selectedNotebookId)
+  if (connected) {
+    setSettingsStatus(t('connectedToUrl', url), false)
+  }
+}
+
 function updateConnBadge() {
  if (!els.connBadge) return
  els.connBadge.hidden = !connected
@@ -256,7 +483,10 @@ function selectionBlockHtml() {

 function actionsBlockHtml() {
  const hasSel = Boolean(selectionText)
-  return `<div class="actions" id="actionsSlot">
+  const contentScriptWarning = !contentScriptReady && !pageRestricted
+    ? `<div class="cs-warning">${escapeHtml(t('contentScriptMissing') || 'Content script non détecté — rechargez la page pour clipper.')}</div>`
+    : ''
+  return `${contentScriptWarning}<div class="actions" id="actionsSlot">
    ${
      hasSel
        ? `<button type="button" class="btn btn-sky" id="clipSelBtn">
@@ -283,7 +513,6 @@ function bindIdleHandlers() {
  document.getElementById('clipPageBtn')?.addEventListener('click', () => void runAnalyze('page'))
  document.getElementById('clipLinkBtn')?.addEventListener('click', () => void runAnalyze('link'))

-  // Gérer l'erreur de chargement du favicon
  document.querySelector('.page-favicon')?.addEventListener('error', function() {
    const fallback = this.getAttribute('data-fallback')
    if (fallback && this.src !== fallback) {
@@ -319,160 +548,6 @@ function updateSelectionUI() {
  bindIdleHandlers()
 }

-function applySelectionFromMessage(msg) {
-  if (!msg) return
-  // Comparaison d'URL tolérante : ignorer trailing slash, hash, query.
-  // Compare origin + pathname, pas l'URL complète.
-  const normalizeUrl = (u) => {
-    if (!u) return ''
-    try { return new URL(u).origin + new URL(u).pathname.replace(/\/+$/, '') }
-    catch { return u }
-  }
-  const msgUrl = msg.url || ''
-  const curUrl = pageUrl || ''
-  // Si pageUrl n'est pas encore set (race avec refreshPageContext),
-  // on accepte le premier message qui arrive et on amorce les métadonnées
-  // de la page depuis le message. Sans ce fallback, le bouton ne s'affiche
-  // jamais si chrome.tabs.query rate ou revient avant refreshPageContext.
-  if (!curUrl) {
-    if (msgUrl) {
-      pageUrl = msgUrl
-      pageTitle = msg.title || pageTitle || ''
-      try {
-        const u = new URL(msgUrl)
-        pageDomain = u.hostname
-        pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
-      } catch { /* ignore */ }
-    } else {
-      return
-    }
-  } else if (normalizeUrl(msgUrl) !== normalizeUrl(curUrl)) {
-    // URL vraiment différente (autre onglet) — ignorer.
-    return
-  }
-  selectionText = msg.text || ''
-  if (msg.dir?.toLowerCase() === 'rtl') pageDir = 'rtl'
-  if (msg.lang) pageLang = msg.lang
-  if (state === 'idle') {
-    // Si la page card n'existait pas encore (pageUrl vide avant),
-    // il faut un render() complet pour qu'elle apparaisse.
-    if (!curUrl) {
-      render()
-    } else {
-      updateSelectionUI()
-    }
-  } else {
-    console.debug('[memento] selection updated while busy, deferring UI')
-  }
-}
-
-async function refreshPageContext() {
-  const tab = await getActiveTab()
-  activeTabId = tab?.id ?? null
-  // Ne marquer restricted QUE si on a vraiment une URL à analyser.
-  // tab?.url undefined doit être traité comme "inconnu", pas restricted.
-  pageRestricted = tab?.url ? isRestrictedUrl(tab.url) : false
-
-  if (!tab?.id || pageRestricted) {
-    pageUrl = tab?.url || ''
-    pageTitle = tab?.title || t('pageNotAccessible')
-    selectionText = ''
-    return
-  }
-
-  pageUrl = tab.url
-  pageTitle = tab.title || ''
-  try {
-    const u = new URL(pageUrl)
-    pageDomain = u.hostname
-    pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
-  } catch {
-    pageDomain = pageUrl
-    pageFavicon = 'https://www.google.com/s2/favicons?domain=google.com&sz=32'
-  }
-
-  const ok = await ensureContentScript(tab.id)
-  if (!ok) return
-
-  try {
-    const ctx = await chrome.tabs.sendMessage(tab.id, { type: 'GET_CONTEXT' })
-    pageHtml = ctx?.html || ''
-    selectionText = ctx?.text || ''
-    pageDir = ctx?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
-    pageLang = ctx?.lang || ''
-  } catch {
-    try {
-      const [{ result }] = await chrome.scripting.executeScript({
-        target: { tabId: tab.id },
-        func: () => ({
-          html: document.documentElement.outerHTML,
-          text: window.getSelection()?.toString().trim() || '',
-          dir: document.documentElement.getAttribute('dir') || '',
-          lang: (document.documentElement.getAttribute('lang') || '').split('-')[0],
-        }),
-      })
-      pageHtml = result?.html || ''
-      selectionText = result?.text || ''
-      pageDir = result?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
-      pageLang = result?.lang || ''
-    } catch {
-      /* ignore */
-    }
-  }
-}
-
-async function loadSettings() {
-  const stored = await chrome.storage.sync.get([STORAGE_KEYS.baseUrl, STORAGE_KEYS.notebookId])
-  if (els.baseUrl) {
-    els.baseUrl.value = ALLOW_INSTANCE_CONFIG
-      ? stored[STORAGE_KEYS.baseUrl] || DEFAULT_BASE
-      : DEFAULT_BASE
-  }
-  await loadNotebooks(stored[STORAGE_KEYS.notebookId])
-}
-
-async function loadNotebooks(preferredId) {
-  try {
-    await ensureApiPermission()
-    const res = await fetch(`${apiBase()}/api/clip/notebooks`, { credentials: 'include' })
-    if (!res.ok) {
-      connected = false
-      updateConnBadge()
-      if (res.status === 401) {
-        throw new Error(t('errLoginRequired'))
-      }
-      throw new Error(t('errLoadNotebooks'))
-    }
-    const data = await res.json()
-    notebooks = data.notebooks || []
-    selectedNotebookId =
-      (preferredId && notebooks.some((n) => n.id === preferredId) ? preferredId : '') ||
-      notebooks[0]?.id ||
-      ''
-    connected = true
-    updateConnBadge()
-    errorMessage = ''
-    setSettingsStatus(t('notebooksLoaded'), false)
-  } catch (e) {
-    notebooks = []
-    connected = false
-    updateConnBadge()
-    errorMessage = e.message
-    setSettingsStatus(e.message, true)
-  }
-}
-
-async function applyInstance() {
-  const url = (els.baseUrl?.value || DEFAULT_BASE).replace(/\/$/, '')
-  if (els.baseUrl) els.baseUrl.value = url
-  await chrome.storage.sync.set({ [STORAGE_KEYS.baseUrl]: url })
-  setSettingsStatus(t('connecting'), false)
-  await loadNotebooks(selectedNotebookId)
-  if (connected) {
-    setSettingsStatus(t('connectedToUrl', url), false)
-  }
-}
-
 function renderIdle() {
  const restrictedBlock = pageRestricted
    ? `<div class="restricted-note">${escapeHtml(t('restrictedPage'))}</div>`
@@ -483,9 +558,14 @@ function renderIdle() {
      ? `<div class="auth-hint">${escapeHtml(errorMessage)}</div>`
      : ''

+  const csWarning = !contentScriptReady && !pageRestricted
+    ? `<div class="cs-warning">${escapeHtml(t('contentScriptMissing') || 'Content script non détecté — rechargez la page pour clipper.')}</div>`
+    : ''
+
  els.screen.innerHTML = `
    ${restrictedBlock}
    ${authHint}
+    ${csWarning}

    <div>
      <span class="label">${escapeHtml(t('destinationNotebook'))}</span>
@@ -532,10 +612,10 @@ function renderConfirm() {
  const reading = formatReadingTime(analyzeResult?.readingTime)
  const tagsHtml = tags.map((t) => `<span class="tag-chip">${escapeHtml(t)}</span>`).join('')

-  // Le résumé et l'extrait peuvent contenir du Markdown produit par l'IA.
-  // On rend le Markdown en HTML (limité et sûr) au lieu de l'afficher brut.
+  // Le résumé peut contenir du Markdown produit par l'IA.
+  // L'extrait est du texte brut : on l'affiche tel quel, sans interpréter de Markdown.
  const summaryHtml = summary ? renderMarkdownSafe(summary) : ''
-  const excerptHtml = (excerpt && pendingClipType !== 'link') ? renderMarkdownSafe(excerpt) : ''
+  const excerptHtml = (excerpt && pendingClipType !== 'link') ? escapePlainText(excerpt) : ''

  els.screen.innerHTML = `
    <div class="confirm-panel">
@@ -552,7 +632,7 @@ function renderConfirm() {
      </section>` : ''}
      ${excerptHtml ? `<section class="preview-block excerpt-block"${rtlAttrs(excerpt)}>
        <header class="preview-block-head"><span class="dot dot-excerpt"></span>${escapeHtml(t('excerptLabel'))}</header>
-        <div class="preview-block-body md md-excerpt">${excerptHtml}</div>
+        <div class="preview-block-body md md-excerpt excerpt-plain">${excerptHtml}</div>
      </section>` : ''}
    </div>
    <div class="actions">
@@ -670,6 +750,7 @@ async function runAnalyze(type) {
      analyzeBody = { url: pageUrl, html: pageHtml, title: pageTitle, mode: 'article' }
    }

+    logDiag('analyze request', `${type} url=${pageUrl?.slice(0, 60)}`)
    const analyzeRes = await fetch(`${apiBase()}/api/clip/analyze`, {
      method: 'POST',
      credentials: 'include',
@@ -682,10 +763,12 @@ async function runAnalyze(type) {
    analyzeResult = analysis
    editableTitle = analysis.title || pageTitle || pageDomain
    state = 'confirm'
+    logDiag('analyze ok', `title=${analysis.title?.slice(0, 40)}`)
    render()
  } catch (e) {
    errorMessage = e.message || t('errNetwork')
    state = 'error'
+    logDiag('analyze error', errorMessage)
    render()
  }
 }
@@ -717,20 +800,34 @@ async function runSave() {
    lastNoteId = saved.noteId
    lastNoteUrl = saved.noteUrl
    state = 'success'
+    logDiag('save ok', `noteId=${lastNoteId}`)
    render()
  } catch (e) {
    errorMessage = e.message || t('errNetwork')
    state = 'error'
+    logDiag('save error', errorMessage)
    render()
  }
 }

 chrome.runtime.onMessage.addListener((msg) => {
-  if (msg?.type === 'SELECTION_CHANGED') applySelectionFromMessage(msg)
+  if (msg?.type === 'SELECTION_CHANGED') {
+    logDiag('SELECTION_CHANGED received', `len=${msg.text?.length || 0}`)
+    applySelectionFromMessage(msg)
+  }
+})
+
+// Surveiller le storage session/local en cas de message perdu.
+storageArea().onChanged.addListener((changes) => {
+  if (changes[SESSION_KEY]?.newValue) {
+    logDiag('storage changed event')
+    applySelectionFromMessage(changes[SESSION_KEY].newValue, { fromStorage: true })
+  }
 })

 chrome.tabs.onActivated.addListener(async () => {
  if (state !== 'idle') return
+  logDiag('tabs.onActivated')
  await refreshPageContext()
  await syncPickMode()
  render()
@@ -740,6 +837,7 @@ chrome.tabs.onUpdated.addListener(async (tabId, info) => {
  if (info.status !== 'complete' || state !== 'idle') return
  const tab = await getActiveTab()
  if (tab?.id === tabId) {
+    logDiag('tabs.onUpdated complete')
    await refreshPageContext()
    await syncPickMode()
    render()
@@ -751,6 +849,14 @@ els.settingsBtn?.addEventListener('click', () => {
  els.settingsPanel.hidden = !els.settingsPanel.hidden
 })

+els.diagToggle?.addEventListener('click', () => {
+  diagOpen = !diagOpen
+  if (els.diagPanel) els.diagPanel.hidden = !diagOpen
+  if (els.diagToggle) els.diagToggle.setAttribute('aria-expanded', String(diagOpen))
+})
+
+els.copyDiagBtn?.addEventListener('click', () => void copyDiagnostics())
+
 document.querySelectorAll('.preset-btn').forEach((btn) => {
  btn.addEventListener('click', () => {
    const url = btn.getAttribute('data-url')
@@ -766,12 +872,12 @@ els.openLoginBtn?.addEventListener('click', () => {
 document.addEventListener('visibilitychange', async () => {
  if (document.visibilityState === 'visible') {
    if (state === 'idle') {
+      logDiag('visibility visible')
      await refreshPageContext()
      await syncPickMode()
      render()
    }
  } else if (document.visibilityState === 'hidden') {
-    // Désactiver le pick mode quand le sidepanel est fermé
    await setPickModeOnTab(false)
  }
 })
--- a/memento-note/extension/i18n.js
+++ b/memento-note/extension/i18n.js
@@ -44,4 +44,13 @@ function applyShellI18n() {
  if (hint) hint.textContent = t('settingsHint')
  const footer = document.querySelector('.footer-meta')
  if (footer) footer.textContent = t('footerVersion')
+  if (typeof els !== 'undefined' && els.diagToggle) {
+    const diagTitle = t('diagnosticsTitle') || 'Diagnostic'
+    els.diagToggle.title = diagTitle
+    els.diagToggle.setAttribute('aria-label', diagTitle)
+  }
+  const diagTitleEl = document.querySelector('.diag-title')
+  if (diagTitleEl) diagTitleEl.textContent = t('diagnosticsTitle') || 'Diagnostic'
+  const copyDiagBtn = document.getElementById('copyDiagBtn')
+  if (copyDiagBtn) copyDiagBtn.textContent = t('copyDiagnostics') || 'Copier'
 }
--- a/memento-note/extension/manifest.json
+++ b/memento-note/extension/manifest.json
@@ -1,7 +1,7 @@
 {
  "manifest_version": 3,
  "name": "__MSG_extName__",
-  "version": "0.4.3",
+  "version": "0.4.4",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "permissions": [
--- a/memento-note/extension/memento-web-clipper-chrome-store.zip
+++ b/memento-note/extension/memento-web-clipper-chrome-store.zip
--- a/memento-note/extension/memento-web-clipper-firefox.xpi
+++ b/memento-note/extension/memento-web-clipper-firefox.xpi
--- a/memento-note/extension/sidepanel.css
+++ b/memento-note/extension/sidepanel.css
@@ -519,12 +519,23 @@ input[type="text"]:focus,
  overflow-wrap: anywhere;
 }
 .excerpt-block .preview-block-body {
-  min-height: 180px;
-  max-height: 360px;
+  min-height: 220px;
+  max-height: 520px;
  overflow-y: auto;
  background: #fcfbf9;
+  font-size: 14px;
+  line-height: 1.75;
+  padding: 16px 18px;
 }
+
+.excerpt-plain {
+  white-space: normal;
+}
+
 .summary-block .preview-block-body {
+  min-height: 120px;
+  max-height: 360px;
+  overflow-y: auto;
  font-style: normal;
  color: rgba(28, 28, 28, 0.78);
  background: rgba(2, 132, 199, 0.04);
@@ -639,6 +650,77 @@ html[dir="rtl"] .sub {
  .page-row .title { font-size: 14px; }
 }

+/* Avertissement content script */
+.cs-warning {
+  padding: 10px 12px;
+  border-radius: var(--radius-sm);
+  background: #fff7ed;
+  border: 1px solid #fdba74;
+  color: #9a3412;
+  font-size: 11px;
+  line-height: 1.5;
+  margin-bottom: 8px;
+}
+
+/* Panneau de diagnostic */
+.diag-panel {
+  border-top: 1px solid var(--border);
+  background: #1c1c1c;
+  color: #e5e5e5;
+  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
+  font-size: 10px;
+  line-height: 1.5;
+}
+.diag-panel[hidden] { display: none !important; }
+.diag-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 8px 12px;
+  background: #2a2a2a;
+}
+.diag-title {
+  font-weight: 700;
+  color: #a3a3a3;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+}
+.diag-copy {
+  background: transparent;
+  border: 1px solid #525252;
+  color: #d4d4d4;
+  border-radius: 6px;
+  padding: 4px 8px;
+  font-size: 10px;
+  cursor: pointer;
+}
+.diag-copy:hover { background: #404040; }
+.diag-body {
+  max-height: 160px;
+  overflow-y: auto;
+  padding: 8px 12px;
+}
+.diag-line {
+  padding: 2px 0;
+  border-bottom: 1px solid #333;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+.diag-line:last-child { border-bottom: none; }
+
+.diag-toggle {
+  background: none;
+  border: none;
+  color: var(--muted);
+  cursor: pointer;
+  padding: 4px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.diag-toggle:hover { color: var(--ink); }
+
 /* Très petits écrans (mobile debug, fenetres étirées) */
@media (max-width: 320px) {
  .brand-text { display: none; }
--- a/memento-note/extension/sidepanel.html
+++ b/memento-note/extension/sidepanel.html
@@ -24,6 +24,9 @@
          <span class="conn-dot"></span>
          <span id="connLabel"></span>
        </div>
+        <button type="button" id="diagToggle" class="diag-toggle" title="Diagnostic" aria-label="Diagnostic" aria-expanded="false">
+          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M12 22c5.523 0 10-4.477 10-10S17.523 2 12 2 2 6.477 2 12s4.477 10 10 10z"/><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"/><line x1="12" y1="17" x2="12.01" y2="17"/></svg>
+        </button>
        <button type="button" id="settingsBtn" class="icon-btn" title="" aria-label="">
          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="3"/><path d="M12 1v2M12 21v2M4.22 4.22l1.42 1.42M18.36 18.36l1.42 1.42M1 12h2M21 12h2M4.22 19.78l1.42-1.42M18.36 5.64l1.42-1.42"/></svg>
        </button>
@@ -53,6 +56,14 @@
    <footer class="footer">
      <span class="footer-meta"></span>
    </footer>
+
+    <div id="diagPanel" class="diag-panel" hidden>
+      <div class="diag-head">
+        <span class="diag-title">Diagnostic</span>
+        <button type="button" id="copyDiagBtn" class="diag-copy">Copier</button>
+      </div>
+      <div id="diagBody" class="diag-body"></div>
+    </div>
  </div>
  <script src="i18n.js"></script>
  <script src="sidepanel.js"></script>
--- a/memento-note/extension/sidepanel.js
+++ b/memento-note/extension/sidepanel.js
@@ -2,6 +2,7 @@
 const ALLOW_INSTANCE_CONFIG = true
 const DEFAULT_BASE = 'https://memento-note.com'
 const STORAGE_KEYS = { baseUrl: 'memento_clipper_base_url', notebookId: 'memento_clipper_notebook_id' }
+const SESSION_KEY = 'memento_clipper_session'

 let state = 'idle'
 let notebooks = []
@@ -25,6 +26,9 @@ let pendingClipType = 'page'
 let analyzeResult = null
 let editableTitle = ''
 let connected = false
+let contentScriptReady = false
+const diagLogs = []
+let diagOpen = false

 const els = {
  screen: document.getElementById('screen'),
@@ -36,6 +40,10 @@ const els = {
  settingsStatus: document.getElementById('settingsStatus'),
  applyInstanceBtn: document.getElementById('applyInstanceBtn'),
  openLoginBtn: document.getElementById('openLoginBtn'),
+  diagPanel: document.getElementById('diagPanel'),
+  diagToggle: document.getElementById('diagToggle'),
+  diagBody: document.getElementById('diagBody'),
+  copyDiagBtn: document.getElementById('copyDiagBtn'),
 }

 const ICON_SELECT =
@@ -71,6 +79,10 @@ function escapeHtml(s) {
    .replace(/"/g, '&quot;')
 }

+function escapePlainText(s) {
+  return escapeHtml(s).replace(/\n/g, '<br/>')
+}
+
 /**
 * Mini-renderer Markdown sûr pour le side panel.
 * - Échappe d'abord le texte (anti-XSS)
@@ -136,6 +148,38 @@ function rtlAttrs(text) {
  return ` class="text-rtl" dir="rtl"${lang}`
 }

+// ---------------------------------------------------------------------------
+// Diagnostic logging
+// ---------------------------------------------------------------------------
+
+function logDiag(label, detail = '') {
+  const line = `[${new Date().toLocaleTimeString()}] ${label}${detail ? ` — ${detail}` : ''}`
+  diagLogs.push(line)
+  if (diagLogs.length > 80) diagLogs.shift()
+  renderDiag()
+  console.debug('[memento-diag]', label, detail)
+}
+
+function renderDiag() {
+  if (!els.diagBody) return
+  els.diagBody.innerHTML = diagLogs.map((l) => `<div class="diag-line">${escapeHtml(l)}</div>`).join('')
+  els.diagBody.scrollTop = els.diagBody.scrollHeight
+}
+
+async function copyDiagnostics() {
+  try {
+    const text = diagLogs.join('\n')
+    await navigator.clipboard.writeText(text)
+    logDiag('diagnostics copied')
+  } catch (e) {
+    logDiag('copy failed', String(e))
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Notebooks
+// ---------------------------------------------------------------------------
+
 function sortNotebooksHierarchy(list) {
  const byParent = new Map()
  for (const n of list) {
@@ -189,29 +233,60 @@ async function getActiveTab() {
  return tab
 }

+// ---------------------------------------------------------------------------
+// Content script synchronization (v0.4.4)
+// ---------------------------------------------------------------------------
+
+function storageArea() {
+  return chrome.storage.session || chrome.storage.local
+}
+
 async function ensureContentScript(tabId) {
+  logDiag('ensureContentScript start', `tab=${tabId}`)
  try {
    const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
-    if (resp?.ok) return true
-  } catch {
-    /* inject */
+    if (resp?.ok) {
+      contentScriptReady = true
+      logDiag('PING ok', `pickMode=${resp.pickMode} sel=${resp.selection?.text?.length || 0}`)
+      if (resp.selection) applySelectionFromMessage(resp.selection, { fromPing: true })
+      return true
+    }
+  } catch (err) {
+    logDiag('PING failed', String(err?.message || err))
  }
  try {
    await chrome.scripting.executeScript({ target: { tabId }, files: ['content.js'] })
-    return true
-  } catch {
+    logDiag('content script injected')
+    // attendre un court instant que le script s'enregistre
+    await new Promise((r) => setTimeout(r, 120))
+    const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
+    contentScriptReady = resp?.ok || false
+    logDiag('PING after inject', `ok=${contentScriptReady}`)
+    return contentScriptReady
+  } catch (err) {
+    contentScriptReady = false
+    logDiag('content script inject failed', String(err?.message || err))
    return false
  }
 }

 async function setPickModeOnTab(enabled) {
-  if (!activeTabId || pageRestricted) return
+  if (!activeTabId || pageRestricted) {
+    logDiag('setPickMode skipped', `tab=${activeTabId} restricted=${pageRestricted}`)
+    return false
+  }
  const ok = await ensureContentScript(activeTabId)
-  if (!ok) return
+  if (!ok) return false
  try {
-    await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
-  } catch {
-    /* ignore */
+    const resp = await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
+    contentScriptReady = resp?.ok || false
+    logDiag('SET_PICK_MODE ok', `enabled=${enabled} pickMode=${resp?.pickMode}`)
+    if (resp?.selection) applySelectionFromMessage(resp.selection, { fromSetPickMode: true })
+    return contentScriptReady
+  } catch (err) {
+    contentScriptReady = false
+    logDiag('SET_PICK_MODE failed', String(err?.message || err))
+    return false
  }
 }

@@ -219,6 +294,158 @@ async function syncPickMode() {
  await setPickModeOnTab(state === 'idle' && !pageRestricted)
 }

+async function readSelectionFromStorage() {
+  try {
+    const data = await storageArea().get(SESSION_KEY)
+    const session = data?.[SESSION_KEY]
+    if (!session) return null
+    logDiag('storage read', `url=${session.url?.slice(0, 60)} sel=${session.text?.length || 0}`)
+    return session
+  } catch (err) {
+    logDiag('storage read failed', String(err?.message || err))
+    return null
+  }
+}
+
+function applySelectionFromMessage(msg, { fromStorage = false, fromPing = false, fromSetPickMode = false } = {}) {
+  if (!msg) return
+  const normalizeUrl = (u) => {
+    if (!u) return ''
+    try { return new URL(u).origin + new URL(u).pathname.replace(/\/+$/, '') }
+    catch { return u }
+  }
+  const msgUrl = msg.url || ''
+  const curUrl = pageUrl || ''
+
+  if (!curUrl) {
+    if (msgUrl) {
+      pageUrl = msgUrl
+      pageTitle = msg.title || pageTitle || ''
+      try {
+        const u = new URL(msgUrl)
+        pageDomain = u.hostname
+        pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
+      } catch { /* ignore */ }
+    } else {
+      return
+    }
+  } else if (normalizeUrl(msgUrl) !== normalizeUrl(curUrl)) {
+    return
+  }
+
+  selectionText = msg.text || ''
+  if (msg.dir?.toLowerCase() === 'rtl') pageDir = 'rtl'
+  if (msg.lang) pageLang = msg.lang
+  logDiag('selection applied', `len=${selectionText.length} source=${fromStorage ? 'storage' : fromPing ? 'ping' : fromSetPickMode ? 'setPickMode' : 'message'}`)
+  if (state === 'idle') {
+    if (!curUrl) render()
+    else updateSelectionUI()
+  }
+}
+
+async function refreshPageContext() {
+  logDiag('refreshPageContext start')
+  const tab = await getActiveTab()
+  activeTabId = tab?.id ?? null
+  pageRestricted = tab?.url ? isRestrictedUrl(tab.url) : false
+  logDiag('active tab', `id=${activeTabId} url=${tab?.url?.slice(0, 80)} restricted=${pageRestricted}`)
+
+  if (!tab?.id || pageRestricted) {
+    pageUrl = tab?.url || ''
+    pageTitle = tab?.title || t('pageNotAccessible')
+    selectionText = ''
+    contentScriptReady = false
+    return
+  }
+
+  pageUrl = tab.url
+  pageTitle = tab.title || ''
+  try {
+    const u = new URL(pageUrl)
+    pageDomain = u.hostname
+    pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
+  } catch {
+    pageDomain = pageUrl
+    pageFavicon = 'https://www.google.com/s2/favicons?domain=google.com&sz=32'
+  }
+
+  const ok = await ensureContentScript(tab.id)
+  if (!ok) {
+    // En dernier recours, lire depuis le storage session/local.
+    const session = await readSelectionFromStorage()
+    if (session) applySelectionFromMessage(session, { fromStorage: true })
+    return
+  }
+
+  try {
+    const ctx = await chrome.tabs.sendMessage(tab.id, { type: 'GET_CONTEXT' })
+    pageHtml = ctx?.html || ''
+    selectionText = ctx?.text || ''
+    pageDir = ctx?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
+    pageLang = ctx?.lang || ''
+    logDiag('GET_CONTEXT ok', `html=${pageHtml.length} sel=${selectionText.length}`)
+  } catch (err) {
+    logDiag('GET_CONTEXT failed', String(err?.message || err))
+    // Fallback storage
+    const session = await readSelectionFromStorage()
+    if (session) applySelectionFromMessage(session, { fromStorage: true })
+  }
+}
+
+async function loadSettings() {
+  const stored = await chrome.storage.sync.get([STORAGE_KEYS.baseUrl, STORAGE_KEYS.notebookId])
+  if (els.baseUrl) {
+    els.baseUrl.value = ALLOW_INSTANCE_CONFIG
+      ? stored[STORAGE_KEYS.baseUrl] || DEFAULT_BASE
+      : DEFAULT_BASE
+  }
+  await loadNotebooks(stored[STORAGE_KEYS.notebookId])
+}
+
+async function loadNotebooks(preferredId) {
+  try {
+    await ensureApiPermission()
+    const res = await fetch(`${apiBase()}/api/clip/notebooks`, { credentials: 'include' })
+    if (!res.ok) {
+      connected = false
+      updateConnBadge()
+      if (res.status === 401) {
+        throw new Error(t('errLoginRequired'))
+      }
+      throw new Error(t('errLoadNotebooks'))
+    }
+    const data = await res.json()
+    notebooks = data.notebooks || []
+    selectedNotebookId =
+      (preferredId && notebooks.some((n) => n.id === preferredId) ? preferredId : '') ||
+      notebooks[0]?.id ||
+      ''
+    connected = true
+    updateConnBadge()
+    errorMessage = ''
+    setSettingsStatus(t('notebooksLoaded'), false)
+    logDiag('notebooks loaded', `${notebooks.length}`)
+  } catch (e) {
+    notebooks = []
+    connected = false
+    updateConnBadge()
+    errorMessage = e.message
+    setSettingsStatus(e.message, true)
+    logDiag('notebooks failed', e.message)
+  }
+}
+
+async function applyInstance() {
+  const url = (els.baseUrl?.value || DEFAULT_BASE).replace(/\/$/, '')
+  if (els.baseUrl) els.baseUrl.value = url
+  await chrome.storage.sync.set({ [STORAGE_KEYS.baseUrl]: url })
+  setSettingsStatus(t('connecting'), false)
+  await loadNotebooks(selectedNotebookId)
+  if (connected) {
+    setSettingsStatus(t('connectedToUrl', url), false)
+  }
+}
+
 function updateConnBadge() {
  if (!els.connBadge) return
  els.connBadge.hidden = !connected
@@ -256,7 +483,10 @@ function selectionBlockHtml() {

 function actionsBlockHtml() {
  const hasSel = Boolean(selectionText)
-  return `<div class="actions" id="actionsSlot">
+  const contentScriptWarning = !contentScriptReady && !pageRestricted
+    ? `<div class="cs-warning">${escapeHtml(t('contentScriptMissing') || 'Content script non détecté — rechargez la page pour clipper.')}</div>`
+    : ''
+  return `${contentScriptWarning}<div class="actions" id="actionsSlot">
    ${
      hasSel
        ? `<button type="button" class="btn btn-sky" id="clipSelBtn">
@@ -283,7 +513,6 @@ function bindIdleHandlers() {
  document.getElementById('clipPageBtn')?.addEventListener('click', () => void runAnalyze('page'))
  document.getElementById('clipLinkBtn')?.addEventListener('click', () => void runAnalyze('link'))

-  // Gérer l'erreur de chargement du favicon
  document.querySelector('.page-favicon')?.addEventListener('error', function() {
    const fallback = this.getAttribute('data-fallback')
    if (fallback && this.src !== fallback) {
@@ -319,160 +548,6 @@ function updateSelectionUI() {
  bindIdleHandlers()
 }

-function applySelectionFromMessage(msg) {
-  if (!msg) return
-  // Comparaison d'URL tolérante : ignorer trailing slash, hash, query.
-  // Compare origin + pathname, pas l'URL complète.
-  const normalizeUrl = (u) => {
-    if (!u) return ''
-    try { return new URL(u).origin + new URL(u).pathname.replace(/\/+$/, '') }
-    catch { return u }
-  }
-  const msgUrl = msg.url || ''
-  const curUrl = pageUrl || ''
-  // Si pageUrl n'est pas encore set (race avec refreshPageContext),
-  // on accepte le premier message qui arrive et on amorce les métadonnées
-  // de la page depuis le message. Sans ce fallback, le bouton ne s'affiche
-  // jamais si chrome.tabs.query rate ou revient avant refreshPageContext.
-  if (!curUrl) {
-    if (msgUrl) {
-      pageUrl = msgUrl
-      pageTitle = msg.title || pageTitle || ''
-      try {
-        const u = new URL(msgUrl)
-        pageDomain = u.hostname
-        pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
-      } catch { /* ignore */ }
-    } else {
-      return
-    }
-  } else if (normalizeUrl(msgUrl) !== normalizeUrl(curUrl)) {
-    // URL vraiment différente (autre onglet) — ignorer.
-    return
-  }
-  selectionText = msg.text || ''
-  if (msg.dir?.toLowerCase() === 'rtl') pageDir = 'rtl'
-  if (msg.lang) pageLang = msg.lang
-  if (state === 'idle') {
-    // Si la page card n'existait pas encore (pageUrl vide avant),
-    // il faut un render() complet pour qu'elle apparaisse.
-    if (!curUrl) {
-      render()
-    } else {
-      updateSelectionUI()
-    }
-  } else {
-    console.debug('[memento] selection updated while busy, deferring UI')
-  }
-}
-
-async function refreshPageContext() {
-  const tab = await getActiveTab()
-  activeTabId = tab?.id ?? null
-  // Ne marquer restricted QUE si on a vraiment une URL à analyser.
-  // tab?.url undefined doit être traité comme "inconnu", pas restricted.
-  pageRestricted = tab?.url ? isRestrictedUrl(tab.url) : false
-
-  if (!tab?.id || pageRestricted) {
-    pageUrl = tab?.url || ''
-    pageTitle = tab?.title || t('pageNotAccessible')
-    selectionText = ''
-    return
-  }
-
-  pageUrl = tab.url
-  pageTitle = tab.title || ''
-  try {
-    const u = new URL(pageUrl)
-    pageDomain = u.hostname
-    pageFavicon = `https://www.google.com/s2/favicons?domain=${u.hostname}&sz=32`
-  } catch {
-    pageDomain = pageUrl
-    pageFavicon = 'https://www.google.com/s2/favicons?domain=google.com&sz=32'
-  }
-
-  const ok = await ensureContentScript(tab.id)
-  if (!ok) return
-
-  try {
-    const ctx = await chrome.tabs.sendMessage(tab.id, { type: 'GET_CONTEXT' })
-    pageHtml = ctx?.html || ''
-    selectionText = ctx?.text || ''
-    pageDir = ctx?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
-    pageLang = ctx?.lang || ''
-  } catch {
-    try {
-      const [{ result }] = await chrome.scripting.executeScript({
-        target: { tabId: tab.id },
-        func: () => ({
-          html: document.documentElement.outerHTML,
-          text: window.getSelection()?.toString().trim() || '',
-          dir: document.documentElement.getAttribute('dir') || '',
-          lang: (document.documentElement.getAttribute('lang') || '').split('-')[0],
-        }),
-      })
-      pageHtml = result?.html || ''
-      selectionText = result?.text || ''
-      pageDir = result?.dir?.toLowerCase() === 'rtl' ? 'rtl' : 'ltr'
-      pageLang = result?.lang || ''
-    } catch {
-      /* ignore */
-    }
-  }
-}
-
-async function loadSettings() {
-  const stored = await chrome.storage.sync.get([STORAGE_KEYS.baseUrl, STORAGE_KEYS.notebookId])
-  if (els.baseUrl) {
-    els.baseUrl.value = ALLOW_INSTANCE_CONFIG
-      ? stored[STORAGE_KEYS.baseUrl] || DEFAULT_BASE
-      : DEFAULT_BASE
-  }
-  await loadNotebooks(stored[STORAGE_KEYS.notebookId])
-}
-
-async function loadNotebooks(preferredId) {
-  try {
-    await ensureApiPermission()
-    const res = await fetch(`${apiBase()}/api/clip/notebooks`, { credentials: 'include' })
-    if (!res.ok) {
-      connected = false
-      updateConnBadge()
-      if (res.status === 401) {
-        throw new Error(t('errLoginRequired'))
-      }
-      throw new Error(t('errLoadNotebooks'))
-    }
-    const data = await res.json()
-    notebooks = data.notebooks || []
-    selectedNotebookId =
-      (preferredId && notebooks.some((n) => n.id === preferredId) ? preferredId : '') ||
-      notebooks[0]?.id ||
-      ''
-    connected = true
-    updateConnBadge()
-    errorMessage = ''
-    setSettingsStatus(t('notebooksLoaded'), false)
-  } catch (e) {
-    notebooks = []
-    connected = false
-    updateConnBadge()
-    errorMessage = e.message
-    setSettingsStatus(e.message, true)
-  }
-}
-
-async function applyInstance() {
-  const url = (els.baseUrl?.value || DEFAULT_BASE).replace(/\/$/, '')
-  if (els.baseUrl) els.baseUrl.value = url
-  await chrome.storage.sync.set({ [STORAGE_KEYS.baseUrl]: url })
-  setSettingsStatus(t('connecting'), false)
-  await loadNotebooks(selectedNotebookId)
-  if (connected) {
-    setSettingsStatus(t('connectedToUrl', url), false)
-  }
-}
-
 function renderIdle() {
  const restrictedBlock = pageRestricted
    ? `<div class="restricted-note">${escapeHtml(t('restrictedPage'))}</div>`
@@ -483,9 +558,14 @@ function renderIdle() {
      ? `<div class="auth-hint">${escapeHtml(errorMessage)}</div>`
      : ''

+  const csWarning = !contentScriptReady && !pageRestricted
+    ? `<div class="cs-warning">${escapeHtml(t('contentScriptMissing') || 'Content script non détecté — rechargez la page pour clipper.')}</div>`
+    : ''
+
  els.screen.innerHTML = `
    ${restrictedBlock}
    ${authHint}
+    ${csWarning}

    <div>
      <span class="label">${escapeHtml(t('destinationNotebook'))}</span>
@@ -532,10 +612,10 @@ function renderConfirm() {
  const reading = formatReadingTime(analyzeResult?.readingTime)
  const tagsHtml = tags.map((t) => `<span class="tag-chip">${escapeHtml(t)}</span>`).join('')

-  // Le résumé et l'extrait peuvent contenir du Markdown produit par l'IA.
-  // On rend le Markdown en HTML (limité et sûr) au lieu de l'afficher brut.
+  // Le résumé peut contenir du Markdown produit par l'IA.
+  // L'extrait est du texte brut : on l'affiche tel quel, sans interpréter de Markdown.
  const summaryHtml = summary ? renderMarkdownSafe(summary) : ''
-  const excerptHtml = (excerpt && pendingClipType !== 'link') ? renderMarkdownSafe(excerpt) : ''
+  const excerptHtml = (excerpt && pendingClipType !== 'link') ? escapePlainText(excerpt) : ''

  els.screen.innerHTML = `
    <div class="confirm-panel">
@@ -552,7 +632,7 @@ function renderConfirm() {
      </section>` : ''}
      ${excerptHtml ? `<section class="preview-block excerpt-block"${rtlAttrs(excerpt)}>
        <header class="preview-block-head"><span class="dot dot-excerpt"></span>${escapeHtml(t('excerptLabel'))}</header>
-        <div class="preview-block-body md md-excerpt">${excerptHtml}</div>
+        <div class="preview-block-body md md-excerpt excerpt-plain">${excerptHtml}</div>
      </section>` : ''}
    </div>
    <div class="actions">
@@ -670,6 +750,7 @@ async function runAnalyze(type) {
      analyzeBody = { url: pageUrl, html: pageHtml, title: pageTitle, mode: 'article' }
    }

+    logDiag('analyze request', `${type} url=${pageUrl?.slice(0, 60)}`)
    const analyzeRes = await fetch(`${apiBase()}/api/clip/analyze`, {
      method: 'POST',
      credentials: 'include',
@@ -682,10 +763,12 @@ async function runAnalyze(type) {
    analyzeResult = analysis
    editableTitle = analysis.title || pageTitle || pageDomain
    state = 'confirm'
+    logDiag('analyze ok', `title=${analysis.title?.slice(0, 40)}`)
    render()
  } catch (e) {
    errorMessage = e.message || t('errNetwork')
    state = 'error'
+    logDiag('analyze error', errorMessage)
    render()
  }
 }
@@ -717,20 +800,34 @@ async function runSave() {
    lastNoteId = saved.noteId
    lastNoteUrl = saved.noteUrl
    state = 'success'
+    logDiag('save ok', `noteId=${lastNoteId}`)
    render()
  } catch (e) {
    errorMessage = e.message || t('errNetwork')
    state = 'error'
+    logDiag('save error', errorMessage)
    render()
  }
 }

 chrome.runtime.onMessage.addListener((msg) => {
-  if (msg?.type === 'SELECTION_CHANGED') applySelectionFromMessage(msg)
+  if (msg?.type === 'SELECTION_CHANGED') {
+    logDiag('SELECTION_CHANGED received', `len=${msg.text?.length || 0}`)
+    applySelectionFromMessage(msg)
+  }
+})
+
+// Surveiller le storage session/local en cas de message perdu.
+storageArea().onChanged.addListener((changes) => {
+  if (changes[SESSION_KEY]?.newValue) {
+    logDiag('storage changed event')
+    applySelectionFromMessage(changes[SESSION_KEY].newValue, { fromStorage: true })
+  }
 })

 chrome.tabs.onActivated.addListener(async () => {
  if (state !== 'idle') return
+  logDiag('tabs.onActivated')
  await refreshPageContext()
  await syncPickMode()
  render()
@@ -740,6 +837,7 @@ chrome.tabs.onUpdated.addListener(async (tabId, info) => {
  if (info.status !== 'complete' || state !== 'idle') return
  const tab = await getActiveTab()
  if (tab?.id === tabId) {
+    logDiag('tabs.onUpdated complete')
    await refreshPageContext()
    await syncPickMode()
    render()
@@ -751,6 +849,14 @@ els.settingsBtn?.addEventListener('click', () => {
  els.settingsPanel.hidden = !els.settingsPanel.hidden
 })

+els.diagToggle?.addEventListener('click', () => {
+  diagOpen = !diagOpen
+  if (els.diagPanel) els.diagPanel.hidden = !diagOpen
+  if (els.diagToggle) els.diagToggle.setAttribute('aria-expanded', String(diagOpen))
+})
+
+els.copyDiagBtn?.addEventListener('click', () => void copyDiagnostics())
+
 document.querySelectorAll('.preset-btn').forEach((btn) => {
  btn.addEventListener('click', () => {
    const url = btn.getAttribute('data-url')
@@ -766,12 +872,12 @@ els.openLoginBtn?.addEventListener('click', () => {
 document.addEventListener('visibilitychange', async () => {
  if (document.visibilityState === 'visible') {
    if (state === 'idle') {
+      logDiag('visibility visible')
      await refreshPageContext()
      await syncPickMode()
      render()
    }
  } else if (document.visibilityState === 'hidden') {
-    // Désactiver le pick mode quand le sidepanel est fermé
    await setPickModeOnTab(false)
  }
 })
--- a/memento-note/lib/clip/extract-article.ts
+++ b/memento-note/lib/clip/extract-article.ts
@@ -17,6 +17,42 @@ export interface ExtractedArticle {
  locale: ClipLocaleHint
 }

+const META_PATTERNS = [
+  // Dates/heures avec "mis à jour / updated / actualizado / aktualisiert"
+  /\b(mis à jour|updated at|actualizado|aktualisiert am|aggiornato alle)\b[\s:|-]*.*/gi,
+  // Temps de lecture
+  /\b(temps de lecture|reading time|lesedauer|tiempo de lectura|tempo di lettura|czas czytania|время чтения|阅读时间|読了時間)\b[\s:|-]*.*/gi,
+  // Lignes de type "Source - Aujourd'hui à 09:15 | mis à jour à 11:07"
+  /^(.*?\s[-–|]\s)(aujourd['’]?hui|today|hoy|heute|oggi|vandaag|dzisiaj|сегодня|今日)\b.*$/gim,
+  // Heures seules type "09:15" ou "09:15 | mis à jour..."
+  /^\s*\d{1,2}:\d{2}(\s*[-|]\s*.*)?$/gm,
+]
+
+export function cleanClipText(text: string): string {
+  let cleaned = text.replace(/\r\n/g, '\n').replace(/\n{3,}/g, '\n\n')
+  for (const pattern of META_PATTERNS) {
+    cleaned = cleaned.replace(pattern, '')
+  }
+  return cleaned
+    .split('\n')
+    .map((line) => line.trim())
+    .filter((line) => line.length > 0)
+    .join('\n')
+    .replace(/\n{3,}/g, '\n\n')
+    .trim()
+}
+
+export function makeExcerpt(text: string, maxLen = 500): string {
+  if (text.length <= maxLen) return text
+  // Préférer couper à la fin d'une phrase.
+  const sentenceEnd = text.lastIndexOf('.', maxLen)
+  if (sentenceEnd > maxLen * 0.6) return text.slice(0, sentenceEnd + 1).trim()
+  // Sinon couper au dernier espace.
+  const space = text.lastIndexOf(' ', maxLen)
+  if (space > maxLen * 0.6) return text.slice(0, space).trim() + '…'
+  return text.slice(0, maxLen).trim() + '…'
+}
+
 export function extractArticleFromHtml(html: string, pageUrl: string): ExtractedArticle | null {
  const dom = new JSDOM(html, { url: pageUrl })
  const reader = new Readability(dom.window.document)
@@ -48,11 +84,13 @@ export function extractArticleFromHtml(html: string, pageUrl: string): Extracted
  const rtlBlocks = applyRtlToHtmlBlocks(sanitized, mergedLocale)
  const content = wrapClipArticleHtml(rtlBlocks, mergedLocale)

+  const cleanText = cleanClipText(article.textContent || '')
+
  return {
    title: (article.title || '').trim(),
    content,
-    textContent: (article.textContent || '').trim(),
-    excerpt: (article.excerpt || '').trim(),
+    textContent: cleanText,
+    excerpt: makeExcerpt(cleanText, 500),
    locale: mergedLocale,
  }
 }