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/components/chat/chat.vue

@@ -387,13 +387,6 @@ const generateMockMessages = (refreshContent: string) => {
   return [userMessage];
 };
 
-const handleCopy = (content: string) => {
-  navigator.clipboard
-    .writeText(content)
-    .then(() => ElMessage.success($t('message.copySuccess')))
-    .catch(() => ElMessage.error($t('message.copyFail')));
-};
-
 const handleRefresh = () => {
   const roundId = String(latestAssistantMessage.value?.roundId || '');
   if (!roundId) {
@@ -643,6 +636,8 @@ onBeforeUnmount(() => {
               :align="item.role === 'user' ? 'end' : 'start'"
               :allow-copy="!!String(item.content || '').trim()"
               :allow-regenerate="canRegenerateMessage(item)"
+              :copy-error-message="$t('message.copyFail')"
+              :copy-text="String(item.content || '').trim()"
               :disabled-variant-next="!canSwitchVariant(item, 'next')"
               :disabled-variant-previous="!canSwitchVariant(item, 'previous')"
               :regenerate-disabled="sending"
@@ -652,7 +647,6 @@ onBeforeUnmount(() => {
                 Number(item.variantIndex || item.selectedVariantIndex || 1)
               "
               :variant-total="Number(item.variantCount || 1)"
-              @copy="handleCopy(item.content)"
               @regenerate="handleRefresh"
               @select-next-variant="handleSelectVariant(item, 'next')"
               @select-previous-variant="handleSelectVariant(item, 'previous')"