refactor: enhance localization support in chat and voice input features

- Integrated localization for various dialog messages and UI elements in the chat and voice input components.
- Updated the confirmation dialog to utilize localized strings for delete messages, improving user experience across different languages.
- Enhanced voice input sheet to reflect localized text for status updates, action buttons, and prompts, ensuring consistency in user interactions.
- Improved the file attachment widget to display the attachment label in a localized manner, enhancing accessibility for users in different regions.
- Streamlined localization management by centralizing string retrieval, promoting maintainability and clarity in the codebase.

lib/l10n/app_localizations_fr.dart

@@ -410,12 +410,45 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get addAttachment => 'Ajouter une pièce jointe';
 
+  @override
+  String get attachmentLabel => 'Pièce jointe';
+
   @override
   String get tools => 'Outils';
 
   @override
   String get voiceInput => 'Entrée vocale';
 
+  @override
+  String get voice => 'Voix';
+
+  @override
+  String get voiceStatusListening => 'Écoute…';
+
+  @override
+  String get voiceStatusRecording => 'Enregistrement…';
+
+  @override
+  String get voiceHoldToTalk => 'Maintenir pour parler';
+
+  @override
+  String get voiceAutoSend => 'Envoi automatique';
+
+  @override
+  String get voiceTranscript => 'Transcription';
+
+  @override
+  String get voicePromptSpeakNow => 'Parlez maintenant…';
+
+  @override
+  String get voicePromptTapStart => 'Appuyez sur \"Démarrer\" pour commencer';
+
+  @override
+  String get voiceActionStop => 'Arrêter';
+
+  @override
+  String get voiceActionStart => 'Démarrer';
+
   @override
   String get messageInputLabel => 'Saisie du message';
 
@@ -431,6 +464,9 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get send => 'Envoyer';
 
+  @override
+  String get codeCopiedToClipboard => 'Code copié dans le presse-papiers.';
+
   @override
   String get sendMessage => 'Envoyer le message';
 
@@ -837,6 +873,16 @@ class AppLocalizationsFr extends AppLocalizations {
   String get quickActionsDescription =>
       'Choisissez jusqu\'à deux raccourcis à épingler près du champ de saisie';
 
+  @override
+  String get chatSettings => 'Discussion';
+
+  @override
+  String get sendOnEnter => 'Envoyer avec Entrée';
+
+  @override
+  String get sendOnEnterDescription =>
+      'Entrée envoie (clavier logiciel). Cmd/Ctrl+Entrée aussi disponible';
+
   @override
   String get display => 'Affichage';