refactor: Update message hint text for improved user guidance

- Changed the placeholder text in the message input field across multiple languages to "Ask Conduit" for better clarity and user engagement.
- Updated localization files for German, English, Spanish, French, Italian, Dutch, Russian, and Chinese to reflect the new hint text.

lib/l10n/app_de.arb

@@ -142,7 +142,7 @@
   "voiceActionStart": "Starten",
   "messageInputLabel": "Nachrichteneingabe",
   "messageInputHint": "Nachricht eingeben",
-  "messageHintText": "Nachricht...",
+  "messageHintText": "Frag Conduit",
   "stopGenerating": "Generierung stoppen",
   "codeCopiedToClipboard": "Code in die Zwischenablage kopiert.",
   "send": "Senden",

lib/l10n/app_en.arb

@@ -323,7 +323,7 @@
   "@messageInputLabel": {"description": "Accessibility label for the message input."},
   "messageInputHint": "Type your message",
   "@messageInputHint": {"description": "Hint shown in the message input field."},
-  "messageHintText": "Message...",
+  "messageHintText": "Ask Conduit",
   "@messageHintText": {"description": "Short placeholder text in the message input."},
   "stopGenerating": "Stop generating",
   "@stopGenerating": {"description": "Action to stop the assistant's response generation."},

lib/l10n/app_es.arb

@@ -141,7 +141,7 @@
   "voiceActionStart": "Iniciar",
   "messageInputLabel": "Entrada de mensaje",
   "messageInputHint": "Escribe tu mensaje",
-  "messageHintText": "Mensaje...",
+  "messageHintText": "Pregunta a Conduit",
   "stopGenerating": "Detener generación",
   "codeCopiedToClipboard": "Código copiado al portapapeles.",
   "send": "Enviar",

lib/l10n/app_fr.arb

@@ -142,7 +142,7 @@
   "voiceActionStart": "Démarrer",
   "messageInputLabel": "Saisie du message",
   "messageInputHint": "Saisissez votre message",
-  "messageHintText": "Message...",
+  "messageHintText": "Demander à Conduit",
   "stopGenerating": "Arrêter la génération",
   "codeCopiedToClipboard": "Code copié dans le presse-papiers.",
   "send": "Envoyer",

lib/l10n/app_it.arb

@@ -142,7 +142,7 @@
   "voiceActionStart": "Avvia",
   "messageInputLabel": "Input messaggio",
   "messageInputHint": "Scrivi il tuo messaggio",
-  "messageHintText": "Messaggio...",
+  "messageHintText": "Chiedi a Conduit",
   "stopGenerating": "Interrompi generazione",
   "codeCopiedToClipboard": "Codice copiato negli appunti.",
   "send": "Invia",

lib/l10n/app_localizations.dart

@@ -905,7 +905,7 @@ abstract class AppLocalizations {
   /// Short placeholder text in the message input.
   ///
   /// In en, this message translates to:
-  /// **'Message...'**
+  /// **'Ask Conduit'**
   String get messageHintText;
 
   /// Action to stop the assistant's response generation.

lib/l10n/app_localizations_de.dart

@@ -451,7 +451,7 @@ class AppLocalizationsDe extends AppLocalizations {
   String get messageInputHint => 'Nachricht eingeben';
 
   @override
-  String get messageHintText => 'Nachricht...';
+  String get messageHintText => 'Frag Conduit';
 
   @override
   String get stopGenerating => 'Generierung stoppen';

lib/l10n/app_localizations_en.dart

@@ -446,7 +446,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get messageInputHint => 'Type your message';
 
   @override
-  String get messageHintText => 'Message...';
+  String get messageHintText => 'Ask Conduit';
 
   @override
   String get stopGenerating => 'Stop generating';

lib/l10n/app_localizations_fr.dart

@@ -456,7 +456,7 @@ class AppLocalizationsFr extends AppLocalizations {
   String get messageInputHint => 'Saisissez votre message';
 
   @override
-  String get messageHintText => 'Message...';
+  String get messageHintText => 'Demander à Conduit';
 
   @override
   String get stopGenerating => 'Arrêter la génération';

lib/l10n/app_localizations_it.dart

@@ -448,7 +448,7 @@ class AppLocalizationsIt extends AppLocalizations {
   String get messageInputHint => 'Scrivi il tuo messaggio';
 
   @override
-  String get messageHintText => 'Messaggio...';
+  String get messageHintText => 'Chiedi a Conduit';
 
   @override
   String get stopGenerating => 'Interrompi generazione';

lib/l10n/app_nl.arb

@@ -141,7 +141,7 @@
   "voiceActionStart": "Start",
   "messageInputLabel": "Berichtinvoer",
   "messageInputHint": "Typ je bericht",
-  "messageHintText": "Bericht...",
+  "messageHintText": "Vraag Conduit",
   "stopGenerating": "Stop met genereren",
   "codeCopiedToClipboard": "Code gekopieerd naar klembord.",
   "send": "Verzenden",

lib/l10n/app_ru.arb

@@ -141,7 +141,7 @@
   "voiceActionStart": "Начать",
   "messageInputLabel": "Ввод сообщения",
   "messageInputHint": "Введите ваше сообщение",
-  "messageHintText": "Сообщение...",
+  "messageHintText": "Спросите Conduit",
   "stopGenerating": "Остановить генерацию",
   "codeCopiedToClipboard": "Код скопирован в буфер обмена.",
   "send": "Отправить",

lib/l10n/app_zh.arb

@@ -141,7 +141,7 @@
   "voiceActionStart": "开始",
   "messageInputLabel": "消息输入",
   "messageInputHint": "输入您的消息",
-  "messageHintText": "消息...",
+  "messageHintText": "问 Conduit",
   "stopGenerating": "停止生成",
   "codeCopiedToClipboard": "代码已复制到剪贴板。",
   "send": "发送",