feat: redesign agents page (architectural-grid style), add image description, fix AI limits, remove dead code

- Redesign agents page with architectural-grid (8) design system:
  rounded-2xl cards, serif headings, motion tabs, dashed templates section
- Replace agent form popup with full-page detail view (SettingsView style)
  with dark planning card, section tooltips, and help button
- Hide advanced mode for slide/excalidraw generators
- Add 'describe images' action to contextual AI assistant
- Add copy button to action/resource preview with HTTP fallback
- Add delete history button to agent run log panel
- Increase AI word limit from 2000 to 5000 (reformulate + transform-markdown)
- Increase max steps slider from 25 to 50
- Fix image description error with clear model compatibility message
- Fix doubled execution count display in agent detail view
- Remove dead files: notes-list-view.tsx, notes-view-toggle.tsx
- Remove 'list' view mode from NotesViewMode type
- Add missing i18n keys (back, configuration, options, copy, cleared)

memento-note/locales/fr.json

@@ -550,7 +550,10 @@
       "preview": "Aperçu",
       "generatePreview": "Générer l'aperçu",
       "emptyNoteHint": "💡 La note est vide — le contenu de la ressource sera intégré directement."
-    }
+    },
+    "cancel": "Annuler",
+    "copied": "Copié",
+    "copy": "Copier"
   },
   "richTextEditor": {
     "bold": "Gras",
@@ -1679,7 +1682,10 @@
       "notifyEmail": "Notification par email",
       "notifyEmailHint": "Recevez un email avec les résultats de l'agent après chaque exécution",
       "includeImages": "Inclure les images",
-      "includeImagesHint": "Extraire les images des pages scrapées et les joindre à la note générée"
+      "includeImagesHint": "Extraire les images des pages scrapées et les joindre à la note générée",
+      "back": "Retour",
+      "configuration": "Configuration",
+      "options": "Options"
     },
     "frequencies": {
       "manual": "Manuel",
@@ -1775,7 +1781,10 @@
       "title": "Historique",
       "noHistory": "Aucune exécution pour le moment",
       "toolTrace": "{count} appels d'outils",
-      "step": "Étape {num}"
+      "step": "Étape {num}",
+      "clearConfirm": "Voulez-vous vraiment supprimer tout l'historique de cet agent ?",
+      "cleared": "Historique supprimé",
+      "clearHistory": "Supprimer l'historique"
     },
     "tools": {
       "title": "Outils de l'agent",
@@ -1890,4 +1899,4 @@
     "initializing": "Initialisation de l'espace de travail",
     "loadingIdeas": "Chargement de vos idées..."
   }
-}
+}