feat(i18n): update chat localization strings to enhance user experience and clarity (#424)

src/i18n/locales/en/chat.json

@@ -3,11 +3,12 @@
     "gatewayRequired": "The OpenClaw Gateway needs to be running to use chat. It will start automatically, or you can start it from Settings.",
     "welcome": {
         "title": "ClawX Chat",
-        "subtitle": "Your AI assistant is ready. Start a conversation below.",
-        "askQuestions": "Ask Questions",
-        "askQuestionsDesc": "Get answers on any topic",
-        "creativeTasks": "Creative Tasks",
-        "creativeTasksDesc": "Writing, brainstorming, ideas"
+        "subtitle": "What can I do for you?",
+        "askQuestions": "Handle Tasks",
+        "askQuestionsDesc": "Work on task-oriented requests",
+        "creativeTasks": "Continuous Execution",
+        "creativeTasksDesc": "Keep running through multi-step work",
+        "brainstorming": "Multi-Agent Parallel"
     },
     "noLogs": "(No logs available yet)",
     "toolbar": {

src/i18n/locales/ja/chat.json

@@ -3,11 +3,12 @@
     "gatewayRequired": "チャットを使用するには OpenClaw ゲートウェイが実行されている必要があります。自動的に起動するか、設定から起動できます。",
     "welcome": {
         "title": "ClawX チャット",
-        "subtitle": "AI アシスタントの準備ができました。下の入力欄から会話を始めましょう。",
-        "askQuestions": "質問する",
-        "askQuestionsDesc": "あらゆるトピックについて回答を得る",
-        "creativeTasks": "クリエイティブタスク",
-        "creativeTasksDesc": "ライティング、ブレスト、アイデア"
+        "subtitle": "何をお手伝いできますか？",
+        "askQuestions": "タスク処理",
+        "askQuestionsDesc": "タスク指向の依頼に対応します",
+        "creativeTasks": "継続実行",
+        "creativeTasksDesc": "複数ステップの作業を継続して進めます",
+        "brainstorming": "マルチエージェント並列"
     },
     "noLogs": "（ログはまだありません）",
     "toolbar": {

src/i18n/locales/zh/chat.json

@@ -3,11 +3,12 @@
     "gatewayRequired": "OpenClaw 网关需要运行才能使用聊天。它将自动启动，或者您可以从设置中启动。",
     "welcome": {
         "title": "ClawX 聊天",
-        "subtitle": "您的 AI 助手已就绪。在下方开始对话。",
-        "askQuestions": "提问",
-        "askQuestionsDesc": "获取任何话题的答案",
-        "creativeTasks": "创意任务",
-        "creativeTasksDesc": "写作、头脑风暴、创意"
+        "subtitle": "我能为你做些什么？",
+        "askQuestions": "处理任务",
+        "askQuestionsDesc": "处理面向任务的请求",
+        "creativeTasks": "持续执行",
+        "creativeTasksDesc": "持续推进多步骤工作",
+        "brainstorming": "多智能体并行"
     },
     "noLogs": "（暂无日志）",
     "toolbar": {