fix: 兼容低版本浏览器消息复制

- 为 Chrome 90 增加剪贴板兼容回退

- 统一聊天与智能体试运行的原色对勾反馈

easyflow-ui-admin/app/src/views/publicChat/index.vue

@@ -1650,18 +1650,6 @@ const isFinalAssistantInRound = (item: BubbleMessage) => {
   return true;
 };
 
-const handleCopyMessage = async (item: BubbleMessage) => {
-  if (!canCopyMessage(item)) {
-    return;
-  }
-  try {
-    await navigator.clipboard.writeText(String(item.content || ''));
-    ElMessage.success($t('bot.publicChatCopySuccess'));
-  } catch {
-    ElMessage.error($t('bot.publicChatCopyFail'));
-  }
-};
-
 const handleRegenerateMessage = async (item: BubbleMessage) => {
   if (sending.value || item.role !== 'assistant') {
     return;
@@ -1960,6 +1948,8 @@ function prefetchVisibleVariants() {
                   <ChatMessageActionBar
                     :align="item.role === 'user' ? 'end' : 'start'"
                     :allow-copy="canCopyMessage(item)"
+                    :copy-error-message="$t('bot.publicChatCopyFail')"
+                    :copy-text="String(item.content || '').trim()"
                     :allow-regenerate="
                       item.role === 'assistant' &&
                       getLatestAssistantMessage()?.id === item.id &&
@@ -1976,7 +1966,6 @@ function prefetchVisibleVariants() {
                       Number(item.variantIndex || item.selectedVariantIndex || 1)
                     "
                     :variant-total="Number(item.variantCount || 1)"
-                    @copy="handleCopyMessage(item)"
                     @regenerate="handleRegenerateMessage(item)"
                     @select-next-variant="handleSelectVariant(item, 'next')"
                     @select-previous-variant="