feat: add show more/less toggle for series description

Allow users to expand long series descriptions with a "Show more" button
and scroll through the full text, instead of being limited to 3 lines.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/i18n/messages/fr/common.json

@@ -260,7 +260,9 @@
       "favorite": {
         "add": "Ajouté aux favoris",
         "remove": "Retiré des favoris"
-      }
+      },
+      "showMore": "Voir plus",
+      "showLess": "Voir moins"
     }
   },
   "books": {