fix(mention): 修复Mention 组件的联想文字选中后应替换触发输入的联想文本，而非追加 #1303

Author: handsomezyw

packages/devui-vue/devui/mention/src/mention.tsx

@@ -67,7 +67,7 @@ export default defineComponent({
       e.stopPropagation();
       e.preventDefault();
       showSuggestions.value = false;
-      textContext.value += item[props.dmValueParse.value as keyof IMentionSuggestionItem];
+      textContext.value = textContext.value.substring(0, 1) + item[props.dmValueParse.value as keyof IMentionSuggestionItem];
     };
 
     const arrowKeyDown = (e: KeyboardEvent) => {
@@ -102,7 +102,9 @@ export default defineComponent({
           e.stopPropagation();
           e.preventDefault();
           showSuggestions.value = false;
-          textContext.value += filteredSuggestions.value[currentIndex.value][props.dmValueParse.value as keyof IMentionSuggestionItem];
+          textContext.value =
+            textContext.value.substring(0, 1) +
+            filteredSuggestions.value[currentIndex.value][props.dmValueParse.value as keyof IMentionSuggestionItem];
           emit('select', filteredSuggestions.value[currentIndex.value]);
         }
       }