perf: Optimize chat input placeholder

ui/src/locales/lang/en-US/ai-chat.ts

@@ -47,7 +47,7 @@ export default {
   inputPlaceholder: {
     speaking: 'Speaking...',
     recorderLoading: 'Transcribing...',
-    default: 'Type your question, Ctrl+Enter for a new line, Enter to send'
+    default: 'Type your question, Ctrl+Enter for a new line'
   },
   uploadFile: {
     label: 'Upload File',

ui/src/locales/lang/zh-CN/ai-chat.ts

@@ -48,7 +48,7 @@ export default {
   inputPlaceholder: {
     speaking: '说话中',
     recorderLoading: '转文字中',
-    default: '请输入问题，Ctrl+Enter 换行，Enter发送'
+    default: '请输入问题，Ctrl+Enter 换行'
   },
   uploadFile: {
     label: '上传文件',

ui/src/locales/lang/zh-Hant/ai-chat.ts

@@ -47,7 +47,7 @@ export default {
   inputPlaceholder: {
     speaking: '說話中',
     recorderLoading: '轉文字中',
-    default: '請輸入問題，Ctrl+Enter 換行，Enter 發送'
+    default: '請輸入問題，Ctrl+Enter 換行'
   },
   uploadFile: {
     label: '上傳文件',