Final improvements: enhance French translations and complete review fixes

Co-authored-by: PeterDaveHello <3691490+PeterDaveHello@users.noreply.github.com>

Author: Copilot

src/_locales/fr/main.json

@@ -98,7 +98,7 @@
   "Clear conversations": "Effacer les conversations",
   "Settings": "Paramètres",
   "Search": "Rechercher",
-  "Search conversations...": "Rechercher des conversations...",
+  "Search conversations...": "Rechercher dans les conversations...",
   "Feature Pages": "Pages de fonctionnalités",
   "Keyboard Shortcuts": "Raccourcis clavier",
   "Open Conversation Page": "Ouvrir la page de conversation",